HK1140869A - A method and system for processing signal - Google Patents

Description

Signal processing method and system

Technical Field

The present invention relates to wireless communications, and more particularly, to a method and system for a variable on demand system.

Background

Mobile communications have transformed the way people communicate, and mobile phones have transformed from a luxury item to an essential part of everyday life. Today, the use of mobile phones is controlled by social situations and not by geographical or technical constraints. Voice connections fulfill the basic requirements of communication, while mobile voice connections will penetrate deeper into everyday life. A variety of integrated mobile multimedia applications using the mobile internet will be the next target of the mobile communication revolution.

Third generation (3G) cellular networks offer a variety of high speed access technologies and mobile telephones that are specifically designed to use these technologies. The network meets the requirements of integrated multimedia applications that support the use of advanced compression standards TV and audio applications, high-profile gaming applications, music interfaces, and peripheral interface support. The processing requirements increase with the increase of chip designers using compression techniques and high bandwidth transmit signals. 3G wireless applications support bit rates from 384Kbit/s to 2Mbit/s, and operation designers provide wireless systems with multimedia capabilities, good quality, weak interference, wide coverage.

Today, with the popularity and use of multimedia services, factors such as power consumption, network capacity, and cost-effective optimization of quality of service (QoS) will become more important. These factors can be achieved through careful network planning and operation, improvements in transmission means, and improvements in the level of receiver technology and chip integration methods. To this end, carriers need technology that can allow them to support increased downlink throughput for mobile multimedia applications and, in turn, provide high quality of service capabilities and speed to consumers of mobile multimedia application services.

Other drawbacks and disadvantages of the prior art will become apparent to one of ordinary skill in the art upon examination of the following system of the present invention as described in conjunction with the accompanying drawings.

Disclosure of Invention

The system and/or method of a variable on demand system (VARIABLE ON DEMAND) according to the present invention will be described in detail with reference to the accompanying drawings and examples.

According to an aspect of the present invention, the present invention provides a signal processing method, including:

in a multi-band, multi-standard wireless transmitter and/or wireless receiver:

configuring one or more filters in the wireless transmitter and/or wireless receiver to operate in accordance with a desired frequency band and a desired communication standard;

determining that a blocker signal (blocker signal) is present in the in-service received signal by the wireless receiver;

configuring the wireless receiver to attenuate the blocking signal.

Preferably, the method further comprises comparing a wideband received signal strength indication with an expected received signal strength indication, wherein the wideband received signal strength indication relates to a signal received by the wireless receiver.

Preferably, the method further comprises configuring one or more gain levels (gain levels) in the wireless receiver based on the comparison.

Preferably, the method further comprises, prior to said running, predicting one or more blocking signals based on the location of the wireless transmitter and/or wireless receiver.

Preferably, the method further comprises configuring a linear characteristic (linearity) of the wireless receiver to attenuate the blocking signal.

Preferably, the one or more filters comprise a baseband filter.

Preferably, the one or more filters are located at an output of the wireless receiver.

Preferably, the one or more filters comprise a plurality of stages (pluralities of ranges).

Preferably, the method further comprises bypassing one or more stages of the plurality of stages in order to configure the one or more filters.

Preferably, the method further comprises configuring one or more capacitors in the one or more filters.

Preferably, the method further comprises configuring one or more resistors in the one or more filters.

Preferably, the method further comprises receiving a signal at an input of the one or more filters using a mixer (mixer).

According to still another aspect of the present invention, there is provided a signal processing system including:

one or more circuits in a multi-band, multi-standard wireless transmitter and/or wireless receiver; wherein the one or more circuits are operable to configure one or more filters in the wireless transmitter and/or wireless receiver to operate in accordance with a desired frequency band and a desired communication standard; wherein the content of the first and second substances,

the one or more circuits are operable to determine that a jamming signal is present in a signal received by the wireless receiver in the operation; and

the one or more circuits are operable to configure the wireless receiver to attenuate the blocking signal.

Preferably, the one or more circuits are operable to compare a wideband received signal strength indication with an expected received signal strength indication, wherein the wideband received signal strength indication is related to a signal received by the wireless receiver.

Preferably, the one or more circuits are operable to configure one or more gain levels in the wireless receiver based on the comparison.

Preferably, the one or more circuits are operable to predict one or more blocking signals based on a location of the wireless transmitter and/or wireless receiver prior to the operating.

Preferably, the one or more circuits are operable to configure a linear characteristic of the wireless receiver to attenuate the blocking signal.

Preferably, the one or more filters comprise a baseband filter.

Preferably, the one or more filters are located at an output of the wireless receiver.

Preferably, the one or more filters comprise a plurality of stages.

Preferably, to configure the one or more filters, the one or more circuits are operable to bypass one or more of the plurality of stages.

Preferably, the one or more circuits are for configuring one or more capacitors in the one or more filters.

Preferably, the one or more circuits are for configuring one or more resistors in the one or more filters.

Preferably, the one or more circuits are configured to receive signals at inputs of the one or more filters using a mixer.

Drawings

FIG. 1 is a schematic block diagram of an exemplary mobile terminal using a variable on demand system in accordance with an embodiment of the present invention;

fig. 2 is a schematic block diagram of an exemplary Long Term Evolution (LTE) wireless transceiver device providing an on-demand variable system according to an embodiment of the present invention;

FIG. 3 is a schematic block diagram of an exemplary baseband filter in accordance with an embodiment of the present invention;

FIG. 4 is a schematic block diagram of an exemplary transmit architecture (transmit architecture) that enables system on-demand variability in accordance with an embodiment of the present invention;

FIG. 5 is a schematic block diagram of an exemplary receive architecture (receive architecture) in accordance with an embodiment of the present invention;

FIG. 6 is a schematic block diagram of a wideband received signal strength indication in accordance with an embodiment of the present invention;

FIG. 7 is a flow chart of exemplary method steps for ensuring system on-demand variability, according to an embodiment of the present invention.

Detailed Description

A method and system for a variable system on demand (VARIABLE ON DEMAND) is described. The present invention includes configuring one or more filters in the transmitter, receiver and/or transceiver to enable communication in a desired frequency band and with a desired communication standard. The presence of a blocking signal in a receiver of the transceiver is determined and the receiver is configured to attenuate the blocking signal. The desired received signal strength indication and the wideband received signal strength indication are compared to attenuate the blocking signal. Prior to operation, a blocking signal is predicted based on the location of the wireless transmitter and/or wireless receiver. One or more gain levels are configured in the receiver based on the comparison. The linearity of the receiver is configured to attenuate blocking signals. The one or more filters, including a baseband filter, may be located at the output of the receiver. One or more filters include multiple stages, one or more of which are bypassed in order to configure the filter. The one or more filters include a mixer as an input. One or more capacitors and/or one or more resistors are configured in one or more filters.

FIG. 1 is a schematic block diagram of an exemplary mobile terminal using a variable on demand system in accordance with an embodiment of the present invention. Referring to fig. 1, the wireless terminal 120 includes a Radio Frequency (RF) receiver 123a, an RF transmitter 123b, a digital baseband processor 129, a Phase Locked Loop (PLL)131, a processor 125, and a memory 127. The wireless terminal 120 communicates via a cellular network (GSM/EDGE, WCDMA, and/or LTE), Wireless Local Area Network (WLAN), Bluetooth network, enabling the reception and processing of GPS signals. In one embodiment of the present invention, the RF receiver 123a and the RF transmitter 123b are integrated, for example, in a single RF transceiver 122. The RF receiver 123a and the RF transmitter 123b are integrated in a single chip, for example, comprising a cellular (GSM/EDGE, WCDMA and/or LTE) radio, a WLAN radio and a bluetooth radio. A single chip comprising cellular, WLAN and bluetooth radios is implemented using, for example, a single CMOS substrate.

One or more transmit and receive antennas are represented by antenna 121 and are communicatively coupled to RF receiver 123a and RF transmitter 123 b. In this regard, the antenna 121 may enable, for example, WLAN and bluetooth transmission and/or reception. A switch or other switching capable device is connected between the RF receiver 123a and the RF transmitter 123b for switching the transmitting and receiving functions of the antenna 121 in the case of using a single antenna for transmission and reception. The wireless terminal 120 operates in a system such as a WLAN, a cellular network (such as LTE, W-CDMA, and/or GSM), a digital television broadcast network (digital video broadcast network), and/or a Wireless Personal Area Network (WPAN) (e.g., bluetooth network). In this regard, the wireless terminal 120 supports a number of wireless communication protocols, including the IEEE 802.11g/n standard, which is specific to WLAN networks.

The RF receiver 123a may comprise suitable logic, circuitry, and/or code that may enable processing of received RF signals. The RF receiver 123a is configured to receive RF signals of multiple frequency bands according to a wireless communication protocol supported by the wireless terminal 120. Each frequency band supported by the RF receiver 123a has corresponding front end circuitry, e.g., for handling low noise amplification and down conversion operations. In this regard, the RF receiver 123a may be referred to as a multi-band receiver if it supports more than one frequency band. In another embodiment of the present invention, the wireless terminal 120 comprises a plurality of RF receivers 123a, wherein each RF receiver 123a is a single band or multi-band receiver. The RF receiver 123a may be implemented on a chip. In one embodiment of the present invention, the RF receiver 123a and the RF transmitter 123b are integrated on a chip to form an RF transceiver, for example. In another embodiment of the present invention, the RF receiver 123a is integrated on one chip with the various components of the wireless terminal 120.

The RF receiver 123a may quadrature down-convert the received RF signal to a baseband frequency signal including an in-phase (I) component and a quadrature (Q) component. The RF receiver 123a may down-convert the received RF signal directly to, for example, a baseband frequency signal. In some cases, the baseband signal components are also analog-to-digital converted before being forwarded to the digital baseband processor 129. In other cases, the RF receiver 123a forwards baseband signal components in analog form.

The digital baseband processor 129 may comprise suitable logic, circuitry, and/or code that may be operable to process and/or manipulate baseband frequency signals. In this regard, the digital baseband processor 129 processes and/or manipulates signals received by the RF receiver 123a and/or signals forwarded to the RF transmitter 123b for transmission to the network in the presence of the RF transmitter 123 b. The digital baseband processor 129 provides control and/or feedback information to the RF receiver 123a and the RF transmitter 123b based on information of the processed signals. The digital baseband processor 129 passes information and/or data from the processed signals to the processor 125 and/or memory 127. Also, the digital baseband processor 129 receives information from the processor 125 and/or the memory 127, and forwards the processed information to the RF transmitter 123b for transmission to the network. In some embodiments of the present invention, digital baseband processor 129 is integrated on a single chip with various components of wireless terminal 120.

The RF transmitter 123b may comprise suitable logic, circuitry, and/or code that may enable processing of the transmit RF signal. The RF transmitter 123b may transmit RF signals over multiple frequency bands. Each frequency band supported by the RF transmitter 123b has corresponding front end circuitry, e.g., for handling amplification and upconversion operations. In this regard, the RF transmitter 123b may be referred to as a multiband transmitter if it supports multiple frequency bands. In another embodiment of the present invention, the wireless terminal 120 comprises more than one RF transmitter 123b, wherein each RF transmitter 123b is a single band or multi-band transmitter. The RF transmitter 123b may be implemented on a chip. In one embodiment of the present invention, the RF transmitter 123b and the RF receiver 123a are integrated on one chip to form, for example, an RF transceiver. In another embodiment of the present invention, the RF transmitter 123b is integrated on one chip with various components of the wireless terminal 120.

The RF transmitter 123b up-converts the baseband frequency signal including the in-phase (I)/quadrature (Q) component into an RF signal in quadrature. For example, the RF transmitter 123b directly up-converts the baseband frequency signal to an RF signal. In some cases, the baseband signal components from the digital baseband processor 129 are also digital-to-analog converted prior to up-conversion. In other cases, the RF transmitter 123b receives baseband signal components in analog form.

The processor 125 may comprise suitable logic, circuitry, and/or code that may enable control and/or data processing operations for the wireless terminal 120. The processor 125 is used to control at least a portion of the RF receiver 123a, the RF transmitter 123b, the digital baseband processor 129, and/or the memory 127. In this regard, the processor 125 may generate at least one signal for controlling operations in the wireless terminal 120. The processor 125 is also used to execute applications used by the wireless terminal 120. For example, the processor 125 may generate at least one control signal and/or execute an application that enables current and proposed WLAN communications and/or bluetooth communications in the wireless terminal 120.

The memory 127 may comprise suitable logic, circuitry, and/or code that may enable storage of data and/or other information that may be used by the wireless terminal 120. For example, memory 127 is used to store processed data generated by digital baseband processor 129 and/or processor 125. Memory 127 is also used to store information such as configuration information for controlling the operation of at least one module in wireless terminal 120. For example, the memory 127 includes the requisite information for configuring the RF receiver 123a to receive WLAN and/or bluetooth signals on the appropriate frequency band.

The RF receiver 123a includes a Low Noise Amplifier (LNA) configured as a single-ended (single-ended) or a differential mode (differential). Likewise, the on-chip balun (balun) is configured in single-ended or differential mode. In this regard, the balun may be integrated on-chip as a load for the LNA, thereby improving the noise figure of the RF receiver 123 a.

The present invention is capable of supporting multiple wireless standards in a single integrated transceiver. In this regard, each transmit chain (chain) and receive chain (chain) may be configured to support LTE, W-CDMA, and GSM wireless standards. LTE technology capabilities include, for example, Orthogonal Frequency Division Multiplexing (OFDM), multiple antennas (MIMO), bandwidth scalability, existing (I-XI) and new (XII-XIV) bands, FDD, and TDD. OFDM capability may provide sufficient performance against multipath effects, flexibility in time/frequency resource allocation, and increased spectral efficiency (spectral efficiency).

MIMO technology enhances data rate and performance, and may include, for example, 1 transmit (Tx) and 2 receive (Rx) antennas. Bandwidth scalability ensures efficient operation over frequency bands allocated with different bandwidths, including, for example, 1.4, 3, 5, 10, 15, and 20 MHz.

Single carrier FDMA (SC-FDMA) ensures frequency domain generation (DFT-Spread OFDM) and scalable bandwidth and flexible scheduling. In one embodiment of the invention, SC-FDMA uses, for example, Quadrature Phase Shift Keying (QPSK) and N-bit (bit) Quadrature Amplitude Modulation (QAM).

The configurable components or portions of the RF receiver 123a include an LNA, a mixer (mixer), an RF filter, a PLL, a Voltage Controlled Oscillator (VCO), an analog-to-digital converter (ADC), and a baseband filter. The receive link may be configured to optimize power consumption for a given standard (LTE, W-CDMA, GSM) and condition (e.g., interference, signal strength).

Configurable components or portions of the RF transmitter 123b include a Power Amplifier (PA), a mixer, an RF filter, a PLL, a VCO, a digital-to-analog converter (DAC), and a baseband filter. The transmittable link is configured to optimize power consumption for a given standard (LTE, W-CDMA, GSM) and condition (e.g., interference, signal strength). A preferred way to configure the transmit chain is to select IQ modulation or polar modulation (polar modulation) to optimize signal strength and power consumption.

Since each supported communication standard includes different filtering requirements, the baseband filter or other filter may be configured to enable communication in any supported standard. For example, for GSM, a Butterworth (Butterworth) filter may be used; for W-CDMA, a Chebyschev filter with 0.3dB ripple (ripple) may be used; whereas in LTE, a chebyshev filter with 1dB ripple (ripple) may be used. In addition, the filter bandwidth requirements may be different. For GSM, the bandwidth may be up to 300 kHz; up to 2MHz in wideband CDMA; in LTE, the bandwidth may vary from 0.7 to 10 MHz. Thus, there are many different filter types and many different filter cut-off frequencies (cutoff frequencies) in the filters. In one embodiment of the invention, there are 3 different filter types and 8 different filter cutoff frequencies.

In accordance with various embodiments of the present invention, various portions of the filter may be activated for different wireless standards. For example, for LTE, all stages of the filter are activated, while for GSM, only two-thirds of the stages are activated. The filter may be adjusted by, for example, switching a capacitor or a resistor. The power consumption of the mobile terminal 120 can be configured according to criteria used to measure the current of the RF receiver 123a or to bypass stages not required by the filter.

Fig. 2 is a schematic block diagram of an exemplary LTE radio providing an on-demand variable system in accordance with an embodiment of the present invention. Referring to fig. 2, an LTE wireless platform 200 includes an LTE chip 210, antennas 201A and 201B, antenna switches 203A and 203B, filters 205A-205F, duplexers (duplexers) 206A and 206B, amplifiers 207A-207E, and a crystal oscillator 217.

The LTE chip 210 includes Low Noise Amplifiers (LNAs) 209A-209N, RF Programmable Gain Amplifiers (PGAs) 209O-209S, mixers 211A-211F, filters 208A-208F, analog-to-digital converters (ADCs) 213A-213D, digital filters 215A and 215B, a crystal oscillator control module 219, a wireless transceiver DSP 221, Voltage Controlled Oscillators (VCOs) 223A and 223B, Low Pass Filters (LPFs) 225A and 225B, Phase Frequency Detector (PFD)/Charge Pump (CP) modules 227A and 227B, multi-modulus dividers (MMDs) 229A and 229B, a phase modulator 231, a reference PLL 233, a digital function module (digital function) 235, and digital-to-analog converters (DACs) 237A and 237B.

The antennas 201A and 201B include electromagnetic signal transmission and/or reception capabilities capable of transmitting or receiving RF signals processed by the LTE chip 210. The antenna switches 203A and 203B may comprise suitable circuitry, logic, and/or code and may be adapted to select a channel for transmitting signals out of the LTE chip 210 and/or a channel for transmitting received signals to the LTE chip 210.

The filters 205A-205F and the baseband filters 208A-208F may comprise suitable circuitry, logic, and/or code and may be adapted to filter received signals. In this regard, signals at the desired frequency may be transmitted through the filters 205A-205F and the baseband filters 208A-208F, while signals outside the desired frequency range may be attenuated. The baseband filters 208A-208F may be configured, including on and off stages, and may be frequency configurable to ensure multi-band, multi-standard operation.

The duplexers 206A and 206B may comprise suitable circuitry, logic, and/or code and may comprise suitable circuitry, logic and/or code that may enable Tx and Rx operations to be performed simultaneously in a single channel. Duplexers 206A and 206B filter out Tx signals to the antenna and Rx signals from the antenna, and may also isolate the chip including Tx and Rx parts, for example, in a printed circuit board.

The amplifiers 207A-207E may comprise suitable circuitry, logic, and/or code and may be adapted to amplify the signal to be transmitted to a desired amplitude suitable for transmission via the antenna 201B. The Low Noise Amplifiers (LNAs) 209A-209N may comprise suitable circuitry, logic, and/or code and may be adapted to amplify received signals and to configure desired gain levels and desired noise figure (noise figure) based on requirements of the standard in which RF communications are being used. The RF PGA 209O-209S may comprise suitable circuitry, logic, and/or code and may be adapted to amplify the transmit signal and provide an interface for components external to the LTE chip 210.

The mixers 211A-211F may comprise suitable circuitry, logic, and/or code and may be adapted to up-convert and/or down-convert baseband or intermediate frequency signals to and/or from RF frequencies to and/or from intermediate or baseband frequencies. Mixers 211A-211F receive as input the signals to be converted, the local oscillator signals enable frequency conversion by generating sum (sum) and difference (difference) signals, the unwanted signals being successively filtered out, leaving only the signals at the desired frequency.

The ADCs 213A-213D may comprise suitable circuitry, logic, and/or code that may be adapted to receive analog signals and generate digital output signals. The DACs 237A and 237B comprise suitable circuitry, logic, and/or code for receiving digital signals and generating analog output signals.

The digital filters 215A and 215B may comprise suitable circuitry, logic, and/or code and may be adapted to perform channel matching filtering (channel matching filtering), de-inversion (de-rotation), and/or digital filtering of the received signal in the digital domain. In this regard, unwanted signals generated by the ADCs 213A and 213B are removed before being passed to the wireless transceiver DSP 221.

The crystal oscillator 217 includes a crystal that oscillates at a characteristic frequency determined by the crystal material itself. The crystal oscillator control module 219 may comprise suitable circuitry, logic, and/or code and may be adapted to control the crystal oscillator 217. The crystal oscillator control module 219 receives a signal at the characteristic frequency of the crystal oscillator 217, amplifies the signal, and feeds this amplified signal back to the crystal oscillator 217. In this way, a stable clock signal is generated at the characteristic frequency of the crystal oscillator 217.

The wireless transceiver DSP 221 comprises suitable circuitry, logic, and/or code that may process digital signals through any function defined by user preferences and/or programming. The digital signal comprises, for example, a baseband signal representing information to be transmitted via antenna 201B and/or received via antenna 201A.

VCOs 223A and 223B include suitable circuitry, logic, and/or code for generating an output signal at a desired frequency defined by an input voltage. The oscillation frequency is configured by changing the input voltage.

The LPFs 225A and 225B may comprise suitable circuitry, logic, and/or code that may be adapted to filter out high frequency signals and allow low frequency signals to pass. LPFs 225A and 225B include feedback loops in the PLL to ensure error correction and frequency lock of the PLL. The signals input to the PLL may include, for example, signals from the crystal oscillator 217 and the reference PLL 233.

The PFD/CP blocks 227A and 227B may comprise suitable circuitry, logic, and/or code and may be adapted to generate error signals from reference signals and feedback signals received from frequency dividers such as MMDs 229A and 229B. The error signal is passed to LPFs 225A and 225B to adjust the generated frequency before being passed to VCOs 223A and 223B.

MMDs 229A and 229B may comprise suitable circuitry, logic, and/or code that may be enabled to divide a received signal from VCO 223A or 223B. The divided signal is passed to PFD/CP blocks 227A and 227B to generate an error signal for frequency locking VCOs 223A and 223B.

Phase modulator 231 comprises suitable circuitry, logic, and/or code that may be adapted to modulate the phase of a signal (generated from a signal received from digital function 235). In this manner, the phase of the LO (local oscillator) signal generated by VCO 223B is configurable.

The reference PLL 233 may comprise suitable circuitry, logic, and/or code that may be operable to generate a desired frequency signal. The output signals are passed to PFD/CP blocks 227A and 227B to provide a reference LO signal for configuring VCO 223B.

Digital function block 235 comprises suitable circuitry, logic, and/or code for performing specific digital functions on the digital baseband signal prior to passing the digital baseband signal to DACs 237A and 237B or phase modulator 231. Digital functions may include, for example, channel matched filtering, rotation (cordic), and calibration.

During operation, the LTE wireless platform (radio platform)200 may support bands I through XIV, and may also support standards such as HSPA +, HSPA, UMTS, and GSM/EDGE. Additionally, WCDMA/LTE systems may support up to 3 bands using dedicated WCDMA/LTE Tx outputs, or up to 5 bands using, for example, a multimode Power Amplifier (PA). Similarly, the LTE wireless platform 200 may support quad-band (quad-band) GSM/EDGE transmission and reception, LTE/WCDMA diversity for 2Rx/1Tx channels (diversity), and FDD and TDD operations. In Tx (transmit), bands V, VI and VII may be supported, with multimode output (a single output may support GSM/EDGE/WCDMA) and independent output. On the Rx (receive) side, new frequency bands such as VII, XI, XIII and XIV can be supported using a single Rx VCO, Rx diversity. In addition, Rx enables implementation of linearity on demand (linear), Tx leakage mitigation, no Tx or Rx inter-stage (interstage) filters or external LNAs. Similarly, a reduction in required supply voltage (e.g., 2.3-2.5V) may support improved battery technology.

In one embodiment of the present invention, the frequencies of the plurality of wireless standard signals may be known based on the location of the LTE wireless platform 200 as determined by GPS data, base station ID, and/or other location acquisition information. In this manner, a blocking signal at a given geographic location may be known and, thus, the LTE wireless platform 200 may be configured to attenuate the blocking signal through configuration of the baseband filters 205A-205F and/or gain control of the LNAs 209A-209N.

Fig. 3 is a schematic block diagram of an exemplary baseband filter in accordance with an embodiment of the present invention. Referring to fig. 3, a baseband (BB) filter 300 includes amplifiers O11, O21, Oint, O12, and O22, resistors R11A, R21A, R31, R11B, Rin, RintA, RintB, R12A, R22A, R32, R12B, and R22B, capacitors C11A, C21A, C11B, C21B, RintA, RintB, C12A, C12B, C22A, and C22B.

In another embodiment of the present invention, below the BB filter 300 is the first stage of the BB filter 300, which includes amplifiers O11B and O21B, resistors R1A, R1B, R3A, R2A, R2B, and R3B, and capacitors C1A, C1B, C2A, and C2B. Also shown is a mixer 301 for receiving as inputs the input voltage Vin and the LO signal. The mixer can essentially replace the resistor used as a voltage-to-current converter at the filter input. In this way, mixer operation can be incorporated into the filter to improve out-of-band rejection for Rx blocking (blocker) appearing at the mixer output.

The BB filter 300 includes an analog filter for limiting the received signal or the signal of the ADC dynamic range, and suppressing (suppressing) an undesired signal such as a blocking signal or an LTE interfering signal. BB filter 300 comprises a reconfigurable 5-order filter such as a dual-pole-dual-stage (biquad) as shown in fig. 3. In one embodiment of the invention, the resistors R11A, R21A, R31, R11B, Rin, PintA, RintB, R12A, R12B, R22A, R32, R12B and R22B, and the capacitors C11A, C21A, C11B, C21B, CintA, CintB, C12A, C12B, C22A and C22B are switchable impedances, so that the resistance or capacitance values can be adjusted by, for example, switching CMOS transistors, to configure the filter characteristics. Example characteristics of the filter configuration include, for example, cutoff (cutoff) frequency, ripple (ripple), and roll-off steepness (droop).

The amplifiers O11, O21, Oint, O12, and O22 comprise suitable circuitry, logic, and/or code that provides gain to the input signal and, when connected with feedback provided by resistors and capacitors, is used to configure, for example, a multi-pole Chebyshev or Butterworth filter. In one embodiment of the invention, each stage can be switched within or outside BB filter 300 to meet the requirements of the wireless standard used on the filter response, such as passband ripple (pass), cutoff frequency, and roll off. For example, the filtering portion may be bypassed to reduce power consumption. Similarly, a high filter cutoff frequency requires a high amplifier bandwidth, resulting in high power consumption. The amplifier power consumption is then programmed by using a low cut-off frequency.

The number of stages of the BB filter 300 is not limited to the values shown in fig. 3. In general, any number of stages may be combined depending on the requirements of the system filter.

FIG. 4 is a block diagram of an exemplary transmit architecture that enables system on-demand variability in accordance with an embodiment of the present invention. Referring to fig. 4, the multi-standard Tx400 includes baseband PGAs 401A-401G, envelope detectors (envelope detectors) 403A and 403B, baluns (balun)405A and 405B, mixer/PGAs 407A-407D, 90-degree phase blocks 409A and 409B, filters 411A and 411B, DAC 413A and 413B, and a Tx DSP 415.

The baseband PGAs 401G-401F, RF PGAs 401A-401E, DAC 413A and 413B are substantially similar to the amplifiers 207A-207E, RF PGAs 209P-209 35237A and 237B shown in FIG. 2.

The envelope detectors 403A and 403B comprise diodes, for example, to enable detection of the envelope function of the amplified signal at the output of the RF PGA 401A-401E. In this way, the output power of the multi-standard Tx400 is determined, so that the output power can be controlled by feedback to the RF PGA.

The baluns 405A and 405B include converters, for example, for converting a balanced signal into an unbalanced signal for transmission through an antenna.

The mixers/PGAs 407A-407D may comprise suitable circuitry, logic, and/or code and may be adapted to up-convert a baseband signal or IF signal to an RF signal and process the RF signal with a configurable gain. mixers/PGAs 407A-407D receive the LO signal and the baseband/IF signal as inputs for up-conversion processing.

The mixers/PGAs 407A-407D include IQ up-converters (upconverters) for IQ/Polar and GSM direct (PLL) modulation for WCDMA/LTE, EDGE. The architecture includes flexible configuration of the front-end at the same output, multi-mode outputs such as WCDMA/LTE and GSM/EDGE, with multi-standard Power Amplifiers (PAs) for EDGE, legacy (legacy) PAs, and polar PAs.

The 90 degree phase block may comprise suitable circuitry, logic, and/or code that may be adapted to provide a phase shift (e.g., 90 degrees) for a received signal. In this regard, the I and Q mixers receive LO signals from the same source, one of which is phase shifted by 90 degrees.

The filters 411A and 411B include low pass filters for reconstruction (reconstruction) and smoothing (smooth) to filter out signals outside the desired frequency band and allow signals within the desired frequency band to pass through. Filters 411A and 411B are configurable filters having multiple stages, each stage functioning or not depending on the type and operating characteristics of the desired filter. For example, a 5-stage Chebyshev filter with 1dB ripple (ripple) is used in LTE, while a 3-stage Butterworth filter is used for GSM/EDGE. In this manner, multiple wireless standards may be transmitted over the same Tx channel. Similarly, a high filter cutoff frequency requires a high amplifier bandwidth, resulting in high power consumption. Then, the amplifier power consumption can be programmed by using a low cut-off frequency.

The Tx DSP 415 comprises suitable circuitry, logic, and/or code for processing digital signals by any function defined by user preference and/or programming. The digital signal comprises, for example, a baseband signal representing information transmitted via the antenna of the multi-standard Tx 400.

During operation, baseband signals are processed by the Tx DSP 415 to generate I and Q signals that are delivered to the DACs 413A and 413B, respectively. The DACs 413A and 413B convert the received signals to analog signals before passing them to the baseband PGAs 401F and 401G (adding gain to the received signals).

The amplified signals are then passed to filters 411A and 411B to filter out unwanted signals before the desired signals are passed to mixers/PGAs 407A-407D. The filtered signal is up-converted to an RF signal by the LO signal received by the mixer/PGA 407A-407D. Each mixer/PGA 407A-407D may up-convert the I or Q signal, passing the I and Q signals to each balun 405A and 405B, which may convert the received signal to an unbalanced signal. The converted signals may be communicated to the RF PGAs 401A-401E. The PGAs 401A-401E may be activated to amplify the desired signal depending on the standard and/or frequency band used.

In one embodiment of the present invention, filters 411A and 411B may be configured for use in the wireless standard used by multi-standard Tx 400. The number or type of stages can be configured for a particular standard and one or more stages in the bypass filter can be configured when power reduction is desired. Alternatively, the amplifier power consumption may be programmable, so that a low filter cut-off frequency is selected for power saving.

Fig. 5 is a schematic block diagram of a receive architecture in accordance with an embodiment of the present invention. Referring to FIG. 5, a multi-standard Rx500 includes LNAs 501A-501G, mixers 503A-503D, envelope detectors 505A and 505B, 90 degree phase blocks 507A and 507B, filters 509A and 509B, ADC 511A and 511B, and an Rx DSP 513.

The LNAs 501A-501G, mixers 503A-503D, envelope detectors 505A and 505B, 90-degree phase blocks 507A and 507B, filters 509A and 509B, ADC 511A and 511B are substantially similar to the LNAs 209A-209W, envelope detectors 403A and 403B, 90-degree phase blocks 409A and 409B, filters 411A and 411B, ADC213A-213D shown in fig. 2 and 4.

The Rx DSP513 comprises suitable circuitry, logic, and/or code for processing digital signals with any functions defined by user preferences and/or programming. The digital signals comprise, for example, baseband signals representing information received via the multi-standard Rx 500.

During operation, RF signals from one or more of the multiple wireless standards are received by the multi-standard Rx500 through an antenna (e.g., antenna 201A shown in fig. 2). The received signal is amplified by LNAs 501A-501G according to the frequency of the received signal and the wireless standard before being down-converted by mixers 503A-503D.

Mixers 503A-503D down-convert the amplified signal and generate I and Q signals using a 90 degree phase block. The I and Q signals are amplified by PGAs 501H and 501I before being filtered by filters 509A and 509B. The filtered signals are then passed to ADCs 511A and 511B for conversion to digital signals that may be processed by Rx DSP 513.

The envelope detectors 505A and 505B measure the received signal and a Wideband Received Signal Strength Indicator (WRSSI) that is used to control the gain of the LNAs 501A-501G and determine the presence of blocking signals. In this manner, the gain of the appropriate LNA 501A-501G in the presence of the blocking signal will be reduced. In addition, the linearity characteristics of the multi-standard Rx500 are configured by monitoring WRSSI and adjusting the gain of the LNAs 501A-501G.

In one embodiment of the invention, the filters 509A and 509B may be configured for the wireless standard used by the multi-standard Rx 500. The number or type of filter stages used may be configured for a particular standard, as well as one or more stages in the bypass filter when power reduction is desired. In another embodiment of the present invention, in the absence of a blocking signal, the current of the multi-standard Rx500 may be adjusted (scale) to optimize the desired received signal. Alternatively, the amplifier power consumption may be programmable, so that a low filter cut-off frequency is selected for power saving.

The multi-standard Rx500 includes low IF for EDGE/GSM and direct conversion capability for WCDMA/LTE and may also include reconfigurable BB filters and ADCs. The multi-standard Rx500 can ensure the required linearity characteristics by, for example, adjusting (scale) the Rx current in the absence of the blocking signal.

The multi-standard Rx500 includes multiple HB and LB LNAs (including LNAs 501A-501G) for driving multiple HB and LB mixers (mixers 503A-503D). LNAs 501A-501G include, for example, common source cascode (common source common base) technology, which may provide fine and coarse gain adjustment magnitudes through control of current.

Fig. 6 is a diagram illustrating a wideband received signal strength indication according to an embodiment of the invention. Referring to fig. 6, the Rx channel 600 includes an LNA 601, mixers 603A and 603B, a 90 degree phase module 605, an analog RSSI module 607, an LO 609, DC servo units (DC servo)611A-611D, LNA613A-613D, filters 615A and 615B, ADC 617 and 617B, channel filters 619A and 619B, and an Automatic Gain Control (AGC) algorithm module 621.

The LNA 601, mixers 603A and 603B, 90 degree phase block 605, analog RSSI block 607, LO 609, filters 615A and 615B, ADC 617 and 617B are substantially similar to LNAs 501A-501G, mixers 503A-503D, 90 degree phase blocks 507A and 507B, envelope detectors 505A and 505B, filters 509A and 509B, ADC 511A and 511B shown in FIG. 5.

The DC servo units 611A-611D may comprise suitable circuitry, logic, and/or code and may be adapted to minimize a DC offset (offset) in the signal to avoid saturation of subsequent gain stages. The DC servo units 611A-611D include feedback channels around the LNAs 613A-613D, low pass filters that determine the DC offset and subtract the offset at the input of the LNAs 613A-613D.

The channel filters 619A and 619B include digital filters for selecting a desired channel from the signals received by the I and Q Rx paths. The channel filter receives input signals from the ADCs 617A and 617B and passes output signals to the AGC algorithm block 621.

The AGC algorithm block 621 may comprise suitable circuitry, logic, and/or code and may be adapted to control the gain stage of the Rx path 600 to provide, for example, desired linearity characteristics and/or blocking signal rejection.

During operation, the received signal is amplified by LNA 601 and downconverted by mixers 603A and 603B using LO 609 and a 90 degree phase shifted LO signal, generating I and Q signals. The I and Q signals are then amplified by PGAs 613A and 613B, filtered by lowpass filters 615A and 615B, and then amplified by LNAs 613C-613D. The amplified and filtered signals are then converted to digital signals by ADCs 617A and 617B and then filtered by channel filters 619A and 619B. Thus, a desired signal (WS) AGC indication is determined by the AGC algorithm block 621 and provides an RSSI value for the desired signal therefrom.

In addition, the analog RSSI block 607 provides a WRSSI signal to the AGC algorithm block 621 to provide gain stage configuration for proper AGC strategy and desired linearity characteristics. The WRSSI AGC is directed to provide RSSI values for the LNA input signals, including WS and any out-of-band (out-of-band) and out-of-channel (out-of-channel) jammer signals (interferers).

In one embodiment of the present invention, the frequencies of the plurality of wireless standard signals may be known based on the location of the Rx channel 600 as determined by GPS data, base station ID, and/or other location acquisition information. In this manner, the blocking signal frequency and power level at a given geographic location may be known, and the Rx channel 600 may be configured to attenuate this known blocking signal through the configuration of the filters 615A and 615B and/or the gain control of the LNAs 613A-613D.

FIG. 7 is a flow chart of method steps for ensuring system on-demand variability, in accordance with embodiments of the present invention. In step 703, which follows step 701, filters 205A-205F, 208A-208F, 300, 509A/509B and/or 615A/615B are configured according to the desired frequency band and wireless standard, and then step 705 is entered for measuring the wideband received signal strength indication and the desired signal strength. In another embodiment of the present invention, the filters 205A-205F, 208A-208F, 300, 509A/509B and/or 615A/615B are adjusted based on a known blocking signal determined by the location of the wireless receiver 500/600. In step 707, the gain of the Rx channel 600 is adjusted using the comparison of the measured signal strengths. In a subsequent step 709, RF signals are transmitted and/or received using the desired wireless standard and in the desired frequency band.

In one embodiment of the present invention, a variable on demand method and system is set forth. In various embodiments of the present invention, one or more of the filters 205A-205F, 208A-208F in the Tx channel 400 or the Rx channel 600 may be configured to operate in one or more frequency bands and/or one or more communication standards. The presence of a blocking signal in the Rx channel 600 may be determined and the Rx channel 600 may be configured to remove the blocking signal. One or more blocking signals may be predicted based on the location of the wireless transmitter and/or wireless receiver prior to receiving the signal. The desired received signal strength indication is compared to the wideband received signal strength indication to reduce blocking signals. Based on the comparison, one or more gain stages are configured in the Rx path 600. The linearity of the Rx channel 600 may be configured to reduce blocking signals. One or more of the filters 205A-205N include a baseband filter. One or more filters 205A-205N are located at the output of the Rx path 600. One or more of the filters 205A-205N include multiple stages, one or more of which are bypassed in order to configure the one or more filters. The one or more filters comprise a mixer as an input. One or more capacitors C11A, C21A, C11B, C21B, CintA, CintB, C12A, C12B, C22A, and C22B, and/or one or more resistors R11A, R21A, R31, R11B, Rin, RintA, RintB, R12A, R22A, R32, R12B, and R22B are configured in the one or more filters.

Another embodiment of the present invention provides a machine and/or computer readable storage and/or medium, having stored thereon, a machine code and/or a computer program comprising at least one piece of code executable by a machine and/or a computer, to cause the machine and/or computer to perform the steps described herein for an on-demand variable system.

In general, the invention can be implemented in hardware, software, firmware, or a combination thereof. The present invention can be realized in an integrated manner in at least one computer system or in a separate manner by placing different components in a plurality of interconnected computer systems. Any kind of computer system or other apparatus adapted for carrying out the methods described herein is suited. A typical combination of hardware, software, and firmware may be a specialized computer system with a computer program that, when being loaded and executed, controls the computer system such that it carries out the methods described herein.

Embodiments of the present invention may be implemented as a board level product (board level product), such as a single chip, an Application Specific Integrated Circuit (ASIC), or as separate components integrated with other portions of the system on a single chip with varying degrees of integration. The degree of integration of the system depends primarily on speed and cost considerations. Modern processors are so diverse that processors currently found on the market can be employed. Additionally, if the processor is available as an ASIC core or logic module, an economically viable processor may be implemented as part of an ASIC device with multiple functions implemented by firmware.

The present invention can also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods described herein. Once loaded in a computer system, the article of manufacture is capable of performing these methods. The computer program in the present invention may be in any form, language, code or notation, having a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: a) conversion to another language, code or notation; b) reproduced in different material ways. However, other forms of computer programs, as would be understood by one of ordinary skill in the art, are also contemplated by the present invention.

The present invention has been described in detail with reference to the above embodiments, and it should be understood that various changes can be made therein by those skilled in the art without departing from the scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. A signal processing method, comprising:

in a multi-band, multi-standard wireless transmitter and/or wireless receiver:

configuring one or more filters in the wireless transmitter and/or wireless receiver to operate in accordance with a desired frequency band and a desired communication standard;

determining that a blocking signal is present in a signal received by the wireless receiver in the operating;

configuring the wireless receiver to attenuate the blocking signal.

2. The signal processing method of claim 1, comprising comparing a wideband received signal strength indication with an expected received signal strength indication, wherein the wideband received signal strength indication is related to a signal received by the wireless receiver.

3. The method of claim 2, comprising configuring one or more gain levels in the wireless receiver based on the comparison.

4. A method according to claim 1, comprising predicting one or more blocking signals based on the location of the wireless transmitter and/or wireless receiver prior to said running.

5. The signal processing method of claim 1, comprising configuring a linear characteristic of the wireless receiver to attenuate the blocking signal.

6. The method of claim 1, wherein the one or more filters comprise a baseband filter.

7. A signal processing system comprising:

one or more circuits in a multi-band, multi-standard wireless transmitter and/or wireless receiver; wherein the one or more circuits are operable to configure one or more filters in the wireless transmitter and/or wireless receiver to operate in accordance with a desired frequency band and a desired communication standard; wherein

The one or more circuits are operable to determine that a jamming signal is present in a signal received by the wireless receiver in the operation; and

the one or more circuits are operable to configure the wireless receiver to attenuate the blocking signal.

8. The signal processing system of claim 7, wherein the one or more circuits are configured to compare a wideband received signal strength indication with an expected received signal strength indication, wherein the wideband received signal strength indication is associated with a signal received by the wireless receiver.

9. The signal processing system of claim 8, wherein the one or more circuits are configured to configure one or more gain levels in the wireless receiver based on the comparison.

10. The signal processing system of claim 7, wherein the one or more circuits are operable to predict one or more blocking signals based on a location of the wireless transmitter and/or wireless receiver prior to the running.