CN106027136A - Non-digital-signal-processing amplifying and forwarding repeater and relay method - Google Patents

Abstract

The invention relates to a DSP-free (Digital Signal Processing: digital signal processing) amplifying and forwarding repeater and a repeating method, belonging to the technical field of relay communication, mainly including a radio frequency signal receiving module and a baseband signal unified amplifying module. The radio frequency signal receiving module is mainly responsible for receiving radio frequency signals and transforming multi-carrier radio frequency signals into baseband signals and transforming baseband signals into high frequency signals and amplifying them before transmitting them. The important innovation of the present invention is that the baseband signal unified amplification module is proposed to replace the traditional amplification and forwarding relay DSP circuit, thereby reducing the complexity of the circuit, saving the power consumption of the circuit part, and meeting the current design requirements of green and energy-saving communication.

Description

A DSP-free amplification and forwarding repeater and repeating method

technical field

The invention relates to a DSP-free (Digital Signal Processing: digital signal processing) amplification and forwarding repeater and a repeating method, which belong to the technical field of relay communication.

Background technique

In order to meet the rapid growth of users who require high-speed access anytime and anywhere, the fourth-generation mobile communication technology (such as TD-LTE-Advanced) adopts relay communication technology. Relay technology mainly includes two categories: Amplify-and-forward (AF: Amplify-and-forward) and Decode-and-forward (DF: Decode-and-forward). The working method of the amplification and forwarding relay link is to deploy multiple relay stations in the cell. After the base station sends the data to a certain relay station, the data is amplified by the relay station and forwarded to a certain user, thereby improving network coverage and transmission rate. However, because the traditional relay needs to use DSP circuits to achieve independent amplification of multiple carriers, the traditional amplification and forwarding relay of OFDM signals usually filters the baseband signal sent by the RF signal transceiver module and then converts it to the digital domain through an analog-to-digital conversion device. Then FFT demodulates the signal through the DSP circuit, and linearly weights the demodulated sub-signals to achieve independent adjustment and amplification of each sub-signal, and then performs IFFT modulation on the signal and converts it through a digital-to-analog conversion device The baseband signal is filtered again and then sent to the radio frequency signal transceiver module for transmission. This traditional amplification and forwarding relay needs to process the signal in the digital domain, which makes the relay circuit more complicated, and the hardware cost increases. The important thing is to increase the extra circuit power consumption, which is inconsistent with the current development trend of green communication.

Contents of the invention

Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a DSP-free amplification and forwarding repeater and a repeating method.

To achieve the above object, the present invention adopts the following technical solutions:

A DSP-free amplification and forwarding repeater, including a radio frequency signal transceiver module and a baseband signal unified amplification module; the radio frequency signal transceiver module includes an antenna, a bandpass filter, a low noise amplifier, a down conversion unit, a frequency synthesis unit, Frequency conversion unit, RF (radio frequency) amplifier; the output end of the antenna is connected to the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected to the second input end of the down-conversion unit, and the output ends of the frequency synthesis unit are respectively connected to the up-conversion unit The first input end of the down-conversion unit is connected to the first input end, the output end of the up-conversion unit is connected to the input end of the RF amplifier, and the output end of the RF amplifier is connected to the input end of the antenna; the baseband signal unified amplification module includes Two filters and operational amplifiers, the input of the first filter is connected to the output of the down-conversion unit, the output of the first filter is connected to the input of the operational amplifier, and the output of the operational amplifier is connected to the second The input end of the filter is connected, and the output end of the second filter is connected with the second input end of the up-conversion unit.

The repeater of the present invention adopts a half-duplex working mode, and completes the work of receiving signals and transmitting signals in the first time slot and the second time slot respectively.

A DSP-free amplification and forwarding relay method, using the above-mentioned DSP-free amplification and forwarding repeater, comprises the following steps:

(1) The radio frequency signal transceiver module receives the multi-carrier signal with OFDM modulation through the antenna, filters out the noise signal through the band-pass filter, and then amplifies it through the low-noise amplifier, and then down-converts it to the baseband signal by the down-conversion unit;

(2) The baseband signal is sent to the baseband signal unified amplification module, the noise is first filtered out by the filter, and then uniformly amplified by the operational amplifier, and the noise is filtered out by the filter again, and the signal is sent back to the RF signal transceiver module;

(3) The signal sent in the previous step is transferred to high frequency by the up-conversion unit, and finally amplified by the RF amplifier and sent to the antenna for emission.

Compared with prior art, the present invention has following advantage:

The present invention aims at the problem of excessive power consumption of the circuit caused by the introduction of the DSP circuit into the traditional amplification and forwarding relay, and proposes a unified baseband signal amplification module that only needs to send the baseband signal to the operational amplifier after being filtered by a filter to complete the process for each subcarrier The unified amplification of the signal, and then filtered by the filter, can be sent to the radio frequency signal transceiver module for transmission, eliminating the need for many cumbersome processes such as analog-to-digital conversion, digital-to-analog conversion, IFFT modulation, and FFT demodulation. The circuit design is simple and easy to use, and Since DSP circuits are not required for processing in the digital domain, the power consumption of the circuit part is reduced and the demand for green energy saving is met.

Description of drawings

Fig. 1 is a schematic diagram of the DSP-free amplification and forwarding relay circuit of the present invention.

Fig. 2 is a working flowchart of the DSP-free amplification and forwarding relay of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a kind of DSP-free amplification and forwarding repeater includes a radio frequency signal transceiver module and a baseband signal unified amplification module; the radio frequency signal transceiver module includes an antenna, a bandpass filter, a low noise amplifier, and a frequency down conversion unit , a frequency synthesis unit, an up-conversion unit, and an RF amplifier; the output end of the antenna is connected to the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected to the second input end of the down-conversion unit, and the output ends of the frequency synthesis unit are respectively connected to the The first input end of the up-conversion unit is connected to the first input end of the down-conversion unit, the output end of the up-conversion unit is connected to the input end of the RF amplifier, and the output end of the RF amplifier is connected to the input end of the antenna; the baseband signal is unified The amplification module includes two filters and operational amplifiers, the input terminal of the first filter is connected to the output terminal of the down-conversion unit, the output terminal of the first filter is connected to the input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the input terminal of the operational amplifier. The input end of the second filter is connected, and the output end of the second filter is connected with the second input end of the up-conversion unit. The single-pole double-throw switch is used to simulate the half-duplex working mode, and the work of receiving signals and transmitting signals is completed in the first time slot and the second time slot respectively.

A DSP-free amplification and forwarding relay method, using the above-mentioned DSP-free amplification and forwarding repeater, comprises the following steps:

The radio frequency signal transceiver module receives the multi-carrier signal using OFDM modulation through the antenna, and filters out the interference signal in the non-target frequency band through the band-pass filter, because the signal is bound to have a certain degree of loss when it is transmitted from the base station to the relay station, so it is necessary to send the signal to Input the low noise amplifier (LNA) to amplify, and then output to the down-conversion unit. The down-conversion unit also needs the local oscillator signal provided by the frequency synthesis unit to down-convert the signal from the LNA to make it a baseband signal and send it to Baseband signal unified amplification module;

After the baseband signal is sent to the baseband signal unified amplification module, the noise needs to be filtered out by the filter before being amplified to prevent the noise signal from being amplified at the same time, and then the noise needs to be filtered out by the filter again after being uniformly amplified by the operational amplifier. Only then can the signal be sent back to the radio frequency signal transceiver module;

The radio frequency signal transceiver module will transfer the signal sent by the baseband signal unified amplification module to high frequency by the up-conversion unit, and finally amplify it through the RF amplifier to make it have a strong power, and then send it to the antenna for emission.

So far, the amplification and forwarding of the multi-carrier signal adopting the OFDM modulation mode has been completed, and the entire working process is shown in FIG. 2 .

Claims (3)

1. the amplification forwarding repeater exempting from DSP, it is characterised in that: include that radio frequency signal transceiving module and baseband signal unify amplification module；Described radio frequency signal transceiving module includes antenna, band filter, low-noise amplifier, down-converter unit, frequency synthesis unit, upconverting unit, RF amplifier；The outfan of antenna is connected with the input of low-noise amplifier, the outfan of low-noise amplifier is connected with the second input of down-converter unit, the outfan of frequency synthesis unit is connected with the first input end of upconverting unit, the first input end of down-converter unit respectively, the outfan of upconverting unit is connected with the input of RF amplifier, and the outfan of RF amplifier is connected with the input of antenna；Described baseband signal is unified amplification module and is included two wave filter and operational amplifier, the input of first wave filter is connected with the outfan of down-converter unit, the outfan of first wave filter is connected with the input of operational amplifier, the input of the outfan of operational amplifier and second wave filter is connected, and the outfan of second wave filter is connected with the second input of upconverting unit.

The amplification forwarding repeater exempting from DSP the most according to claim 1, it is characterised in that: use semiduplex working method, be respectively completed at the first time slot and the second time slot and receive signal and launch the work of signal.

3. exempt from an amplification forwarding trunking method of DSP, use the above-mentioned amplification forwarding repeater exempting from DSP, it is characterised in that comprise the following steps:

(1) radio frequency signal transceiving module receives the multi-carrier signal using OFDM modulation system by antenna, filters noise signal through band filter, then amplifies through low-noise amplifier, then by down-converter unit, it is downconverted to baseband signal；

(2) baseband signal is admitted to baseband signal and unifies amplification module, first passes through wave filter and filters noise, then unify to amplify to it through operational amplifier, is again filtered noise by wave filter, signal is returned to radio frequency signal transceiving module；

(3) signal is moved tremendously high frequency by upconverting unit by the signal sent in previous step, delivers to antenna and launch after finally amplifying via RF amplifier.