CN1933467B - Wideband single carrier/multi-carrier equalizing receiver and receiving method thereof - Google Patents

Abstract

The present invention provides a broadband single-carrier/multi-carrier equalization receiving device and its receiving method, including: a radio frequency receiving module, a synchronization and channel estimation module, a serial/parallel conversion module, a frequency domain equalization module, and a switching module, which are used for performing single-carrier Or the switching of multi-carrier demultiplexing and de-framing; the single-carrier signal recovery/de-frame module is used to recover the symbols transmitted by single-carrier; the multi-carrier signal recovery/de-frame module is used to recover the symbols transmitted by multi-carriers. The device of the present invention can be applied to equalized receiving devices for single-carrier transmission and multi-carrier transmission at the same time, and expands the limitation that multi-carrier equalization must be equalized in frequency domain sub-channels, and directly performs frequency domain equalization for the sampling signal of the received signal, simplifying It eliminates the complexity of equalizing the reception, makes the data recovery at the back end easier, and improves the flexibility of the receiver application.

Description

Broadband single-carrier/multi-carrier equalization receiving device and receiving method thereof

technical field

The invention relates to an equalized receiving device and its basic receiving method applied in the field of wireless mobile communication, in particular to an equalized receiving device and its receiving method in the case of a fading channel in a wireless communication system.

Background technique

In a communication system, due to the time-domain dispersion characteristics of the channel, the receiver simultaneously receives multiple multipath fading signals with different delays of the transmitted signal, and the multipath effect of the channel will lead to inter-symbol interference. The receiver must adopt certain techniques To overcome multipath fading and restore the original transmitted signal.

In the second-generation mobile communication system, the Viterbi equalizer is used to overcome multipath fading, and its complexity is an exponential function of the channel memory length, so it is not suitable for broadband communication systems. In the third-generation mobile communication system WCDMA/HSDPA, time-domain linear equalizer is used to compensate channel distortion. The disadvantage of this technology is that the complexity of its implementation is the third power of the channel memory length, and its performance is affected by residual intersymbol interference. Influence. The multi-carrier transmission technology can effectively overcome the multipath fading of the channel. It divides the entire bandwidth into several orthogonal sub-carriers, which makes the symbol duration longer. Each sub-carrier channel is approximately flat fading, and the receiver only needs to do low-complexity degree of single-point equilibrium. The single-carrier/multi-carrier transmission technology based on cyclic prefix (CP) can effectively isolate the influence of channel multipath fading, so that low-complexity frequency domain equalization can be used for channel equalization.

As shown in Fig. 1 is the equalized receiving device of the existing single-carrier transmission system, which includes sequentially connected: antenna, cyclic prefix removal module, serial/parallel conversion module, FFT (fast Fourier transform) module, subchannel equalization module, IFFT (inverse Fourier transform) module, parallel/serial conversion module, demapping module, channel decoding module, and information bit module.

What Fig. 2 shows is the equalized receiving device of existing multi-carrier transmission system, and this device comprises successively connected: radio frequency receiving module, series/parallel conversion module, multi-channel time-domain filtering module, the first Fourier transform module, multi-channel A frequency domain equalization module, a parallel/serial conversion module, a demapping and deinterleaving module, a channel decoding module, and an information bit module. Each of the frequency domain equalization modules described therein includes sequentially connected: a cyclic prefix removal module, a Fourier transform module, a sub-channel equalization module, and an inverse Fourier transform module.

The shortcoming of traditional single-carrier/multi-carrier transmission system equalized receiving method is that it must match its transmission mode and has high complexity. Single-carrier equalization must be performed on virtual subcarriers in the frequency domain. Multi-carrier equalization must be performed on subcarriers after multi-carrier demodulation. Frequency-domain equalization needs to be performed on each subcarrier. Fast Fourier Transform (FFT) is required. The number is twice the number of subcarriers. When the number of sub-carriers is large, the complexity of the system is high, which is not conducive to actual system implementation. Due to the different equalization methods of traditional single-carrier and multi-carrier transmission, when the third generation mobile communication system adopts single-carrier transmission for uplink and multi-carrier transmission for downlink, the system needs to adopt different equalization strategies for uplink and downlink, which is not conducive to the realization of the system .

Contents of the invention

The technical problem to be solved by the present invention is to provide an equalized receiving device that can be applied to both single-carrier transmission and multi-carrier transmission. The signal is equalized in the frequency domain, which simplifies the complexity of equalized reception, makes the data recovery at the back end easier, and improves the flexibility of the receiver application.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A broadband single-carrier/multi-carrier equalization receiving device is provided, including: a radio frequency receiving module, a synchronization and channel estimation module, and a serial/parallel conversion module, characterized in that it also includes:

A frequency domain equalization module, which is connected to the output of the serial/parallel conversion module and the synchronization and channel estimation module, uses the estimated channel fading coefficient to perform frequency domain equalization on the sampled signal;

A switching module, which is connected to the output end of the frequency domain equalization module, and is used for switching single carrier or multi-carrier demultiplexing and deframing;

A single carrier signal recovery/deframing module, which is connected to the output of the switching module 8, for recovering symbols transmitted by a single carrier;

The multi-carrier signal recovery/deframing module is connected to the output end of the switching module 8, and is used for recovering symbols transmitted by the multi-carrier.

Further, the present invention also provides a broadband single-carrier/multi-carrier balanced receiving method, including: a radio frequency receiving step, a synchronization and channel estimation step, a serial/parallel conversion step, and:

A frequency domain equalization step, utilizing the estimated channel fading coefficient to perform frequency domain equalization on the sampled signal;

The switching step is to perform switching of single carrier or multi-carrier demultiplexing and deframing;

A single carrier signal recovery/deframing step, used to recover symbols transmitted by a single carrier;

The multi-carrier signal recovery/de-framing step is used to recover symbols transmitted by the multi-carrier.

The broadband single-carrier/multi-carrier balanced receiving device of the present invention can be widely used in the field of wireless broadband communication and mobile communication, especially in the field of fourth-generation mobile communication, and will have broad development prospects. It is mainly used to receive broadband wireless signals. The same receiver can receive single-carrier transmission signals and multi-carrier transmission signals. It can adapt to more communication scenarios that traditional single-carrier and multi-carrier cannot fully adapt to, adding a new design freedom to the communication system. The broadband single-carrier/multi-carrier equalization receiving device theoretically unifies the single-carrier and multi-carrier equalization reception technologies based on cyclic prefix, and the latter two are special applications of the former.

Description of drawings

FIG. 1 is a schematic structural diagram of an equalized receiving device of an existing single-carrier transmission system.

Fig. 2 is a schematic structural diagram of an equalized receiving device of an existing multi-carrier transmission system.

FIG. 3 is a schematic structural diagram of a broadband single-carrier/multi-carrier equalization receiving device of the present invention.

Fig. 4 is a schematic diagram of an application example of the present invention.

Detailed ways

As shown in Figures 3 and 4, the broadband single-carrier/multi-carrier equalization receiving device of the present invention includes:

The radio frequency receiving module 1 receives the signal in the wireless channel, converts the frequency to the baseband for processing. After the receiving antenna and the radio frequency processing module, the receiver outputs the baseband signal.

The synchronization and channel estimation module 2 is connected with the output terminal of the radio frequency receiving module, and is used to complete the time-frequency synchronization of the received signal and the channel fading coefficient estimation.

Remove the cyclic prefix (CP) module 3, which is connected with the output of the radio frequency receiving module, and is used to delete the signal cyclic prefix subjected to intersymbol interference, eliminate interblock interference, and isolate the influence of channel delay expansion, so as to facilitate the frequency of the receiver domain balance.

The serial/parallel conversion module 4 is responsible for converting the input serial data sequence into a parallel output data sequence.

A frequency domain equalization module, which is connected to the output of the serial/parallel conversion module and the synchronization and channel estimation module, uses the estimated channel fading coefficient to perform frequency domain equalization on the sampled signal;

The switching module 8 is connected to the output terminal of the frequency domain equalization module, and is used for switching single carrier or multi-carrier demultiplexing and deframing for further processing.

A single carrier signal recovery/deframing module, which is connected to the output of the switching module 8, for recovering symbols transmitted by a single carrier;

A multi-carrier signal recovery/de-framing module, which is connected to the output of the switching module 8, for recovering the symbols transmitted by the multi-carrier;

Wherein, the frequency domain equalization module includes sequentially connected:

FFT transformation module 5, it is connected with the output terminal of serial/parallel conversion module, is used for the received signal data block conversion of certain length to frequency domain, so that frequency domain equalization eliminates the influence of channel to this data block;

A single-point equalization module 6, which is connected to the output of the FFT transformation module, is used to compensate the channel impairment in the frequency domain for phase and amplitude;

The IFFT transformation module 7 is connected to the output terminal of the single-point equalization module, and is used to restore the frequency-domain sub-band signals that have been equalized in the frequency domain to the time domain for further processing.

The single carrier signal recovery/deframing module includes sequentially connected:

A parallel/serial conversion module 10, which is connected to the output end of the switching module, is used to convert the input parallel data sequence into a serial output data sequence.

The demapping and deinterleaving module 11 is configured to demap the input data sequence into a corresponding digital sequence according to the symbol mapping rule of the sending end, and perform bit deinterleaving. If the channel decoding to be performed is based on hard decision input information, a hard information digital sequence composed of 0 and 1 is output. Otherwise symbol demapping will provide the corresponding digital sequence of soft information based on digital bit quantization.

The channel decoding module 12 is configured to execute a corresponding channel decoding algorithm. Through the channel decoding module, the input coded bit data sequence is transformed into an information bit data sequence.

The information bit module 13 is used to transfer the information bit data sequence recovered by the receiver to the upper layer application module for processing.

The described multi-carrier signal recovery/deframing module includes sequentially connected:

The multi-channel time-domain filtering module 9 is connected to the output terminal of the frequency-domain equalization module, and is used to perform sub-band filtering on the multi-carrier transmission signal.

The FFT transformation module 5 performs fast Fourier transformation on the filtered signal.

The parallel/serial conversion module 10 is used for converting the input parallel data sequence into a serial output data sequence.

The demapping and deinterleaving module 11 is configured to demap the input data sequence into a corresponding digital sequence according to the symbol mapping rule of the sending end, and perform bit deinterleaving. If the channel decoding to be performed is based on hard decision input information, a hard information digital sequence composed of 0 and 1 is output. Otherwise symbol demapping will provide the corresponding digital sequence of soft information based on digital bit quantization.

The channel decoding module 12 is configured to execute a corresponding channel decoding algorithm. Through the channel decoding module, the input coded bit data sequence is transformed into an information bit data sequence.

The information bit module 13 is used to transfer the information bit data sequence recovered by the receiver to the upper layer application module for processing.

With the present invention, the receiver can receive both single-carrier transmission signals and multi-carrier transmission signals, adopt frequency domain equalization reception based on signal sampling to uniformly equalize the received signals, and then perform single-carrier or multi-carrier transmission according to the transmission The signal is switched, and the transmitted information bit sequence is obtained from the equalized signal by using the corresponding signal demultiplexing/deframing method.

Further, the broadband single-carrier/multi-carrier balanced receiving method of the present invention includes:

The radio frequency receiving step is to receive the signal in the wireless channel, convert the frequency to the baseband for processing. After the receiving antenna and the radio frequency processing module, the receiver outputs the baseband signal.

The synchronization and channel estimation step is used to complete the time-frequency synchronization of the received signal and the channel fading coefficient estimation.

The step of removing cyclic prefix (CP) is used to delete the signal cyclic prefix subject to inter-symbol interference, eliminate inter-block interference, and isolate the influence of channel delay expansion, so as to facilitate frequency domain equalization of the receiver.

The serial/parallel conversion step is responsible for converting the input serial data sequence into a parallel output data sequence.

A frequency domain equalization step, utilizing the estimated channel fading coefficient to perform frequency domain equalization on the sampled signal;

The handover step is used to perform handover of single carrier or multi-carrier demultiplexing and deframing for further processing.

A single carrier signal recovery/deframing step, used to recover symbols transmitted by a single carrier;

A multi-carrier signal recovery/deframing step for recovering symbols transmitted by the multi-carrier;

Wherein, the frequency domain equalization step includes:

The FFT transformation step is used to transform the received signal data block of a certain length into the frequency domain, so as to facilitate frequency domain equalization and eliminate the influence of the channel on the data block;

A single-point equalization step for phase and amplitude compensation of channel impairments in the frequency domain;

The IFFT transformation step, which is connected to the output end of the single-point equalization module, is used to restore the frequency-domain sub-band signals that have been equalized in the frequency domain to the time domain for further processing.

The steps of recovering/deframing the single carrier signal include:

The parallel/serial conversion step is used to convert the input parallel data sequence into a serial output data sequence.

The demapping and deinterleaving step is used to demap the input data sequence into a corresponding digital sequence according to the symbol mapping rule of the sending end, and perform bit deinterleaving. If the channel decoding to be performed is based on hard decision input information, a hard information digital sequence composed of 0 and 1 is output. Otherwise symbol demapping will provide the corresponding digital sequence of soft information based on digital bit quantization.

The channel decoding step is used to execute a corresponding channel decoding algorithm. Through the channel decoding module, the input coded bit data sequence is transformed into an information bit data sequence.

The information bit step is used to transfer the information bit data sequence recovered by the receiver to the upper layer application module for processing.

The steps of recovering/deframing the multi-carrier signal include:

The multi-channel time-domain filtering step is used to perform sub-band filtering on the multi-carrier transmission signal.

An FFT transformation step, which performs fast Fourier transformation on the filtered signal.

The parallel/serial conversion step is used to convert the input parallel data sequence into a serial output data sequence.

The demapping and deinterleaving step is used to demap the input data sequence into a corresponding digital sequence according to the symbol mapping rule of the sending end, and perform bit deinterleaving. If the channel decoding to be performed is based on hard decision input information, a hard information digital sequence composed of 0 and 1 is output. Otherwise symbol demapping will provide the corresponding digital sequence of soft information based on digital bit quantization.

The channel decoding step is used to execute a corresponding channel decoding algorithm. Through the channel decoding module, the input coded bit data sequence is transformed into an information bit data sequence.

The information bit step is used to transfer the information bit data sequence recovered by the receiver to the upper layer application module for processing.

For the reception and transmission system shown in Figure 3, it can be assumed that the length of the transmitted signal block is M, and the length of the cyclic prefix (CP) is greater than the maximum delay extension of the channel. At this time, the baseband sampling signal vector after removing the CP at the receiving end can be expressed as :

                                                                                                                                                                                                

Where x is the baseband sampling vector sent in M×1 dimension; z is the zero-mean white Gaussian noise vector, and satisfies $\mathrm{E.}\left\{{\mathrm{zz}}^h\right\}={\mathrm{\σ}}_z^2{I}_m;$ H is the channel matrix, which is a circular matrix and can be expressed in the following form:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>{\left[\begin{array}{cccccc}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; L</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; L</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\\ \mathrm{<span\; class="notranslate">\; m</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; o</span>}& \mathrm{<span\; class="notranslate">\; L</span>}& \mathrm{<span\; class="notranslate">\; o</span>}& \mathrm{<span\; class="notranslate">\; m</span>}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; m</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; o</span>}& \mathrm{<span\; class="notranslate">\; L</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\\ \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; m</span>}& \mathrm{<span\; class="notranslate">\; o</span>}& \mathrm{<span\; class="notranslate">\; o</span>}& \mathrm{<span\; class="notranslate">\; m</span>}\\ \mathrm{<span\; class="notranslate">\; m</span>}& \mathrm{<span\; class="notranslate">\; m</span>}& \mathrm{<span\; class="notranslate">\; o</span>}& \mathrm{<span\; class="notranslate">\; m</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; L</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>& \mathrm{<span\; class="notranslate">\; L</span>}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>\end{array}\right]}_{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

h=[h(0), h(1)...., h(L-1)] ^T is the channel response vector between the transmitting antenna and the receiving antenna, and L is the maximum resolvable path of the channel. Since H is a circulant matrix, it can be diagonalized, then H can be expressed as:

H=F ^H ΛF (3)

Wherein, F represents the normalized DFT transformation matrix, Λ=diag{H(0), H(1),..., H(M-1)}, H(k) is the DFT transformation of h, namely:

[H(0), H(1), .., H(M-1)] ^T = sqrt(M)Fh (4)

When the channel impulse response and noise statistical characteristics are known, the minimum mean square error (MMSE) of the baseband transmitted sample signal vector obtained from the baseband received signal sample vector y is estimated as:

${\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}}_{\mathrm{<span\; class="notranslate">\; MMSE</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; Wy</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; f</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}\mathrm{<span\; class="notranslate">\; \&Lambda;</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; )</span>}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

Therefore, the estimate of the sampled signal vector x transmitted at baseband is:

${\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}}_{\mathrm{<span\; class="notranslate">\; MMSE</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; f</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}\mathrm{<span\; class="notranslate">\; \&Lambda;</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; )</span>}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}\mathrm{<span\; class="notranslate">\; Fy</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

The estimation method given by the above formula requires one DFT and one IDFT operation, and at the same time, calculating the frequency domain response of the channel requires one DFT operation. The complexity of the receiver has nothing to do with the number of sub-carriers transmitted by the system information, that is, the transmitted baseband sampling signal can be restored by one frequency domain equalization.

An estimate of the signal vector x from the baseband samples sent by Single-carrier or multi-carrier demultiplexing and de-framing can restore the original information of single-carrier or multi-carrier transmission.

Claims (5)

1. broadband single-carrier/multi-carrier equalizing receiver comprises: Receiver Module, synchronously and channel estimation module, serial/parallel modular converter, it is characterized in that, and also comprise:

The frequency domain equalization module, its with serial/parallel modular converter, be connected with the output of channel estimation module synchronously, it utilizes the estimated channel fading coefficients that sampled signal is carried out frequency domain equalization;

Handover module, its output with the frequency domain equalization module is connected, and is used to carry out the switching that single carrier or multicarrier demultiplexing are separated frame;

Frame module is recovered/separated to single-carrier signal, and it is connected with the output of handover module, is used to recover the symbol of single carrier transmission;

Multi-carrier signal recovers/separates frame module, and it is connected with the output of handover module, is used to recover the symbol of multi-carrier transmission.

2. broadband single-carrier/multi-carrier equalizing receiver according to claim 1 is characterized in that, also comprises:

Remove cyclic prefix module, be connected, be used to delete the signal cycle prefix that is subjected to intersymbol interference, eliminate inter-block-interference, isolate the influence of channel delay expansion with the output of Receiver Module, the input of serial/parallel modular converter.

3. broadband single-carrier/multi-carrier equalizing receiver according to claim 1 and 2 is characterized in that, described frequency domain equalization module comprises successively and to connect:

The FFT conversion module, it is connected with the output of serial/parallel modular converter, is used for the received signal data block of certain-length is transformed to frequency domain;

The single-point balance module, its output with the FFT conversion module is connected, and is used at frequency domain channel impairments being carried out the compensation of phase place and amplitude;

The IFFT conversion module, its output with the single-point balance module is connected, and the frequency domain subband signal that is used for passing through frequency domain equalization returns to time domain.

4. broadband single-carrier/multi-carrier equalizing receiver according to claim 1 and 2 is characterized in that, described single-carrier signal is recovered/separated frame module and comprises successively and to connect:

Parallel/serial modular converter, it is connected with the output of handover module, is used for the parallel data sequence transformation of input is become the dateout sequence of serial;

Separate the mapping de-interleaving block, be used for the data sequence of input being separated and be mapped to the corresponding digital sequence, and carry out the bit deinterleaving according to the sign map rule of transmitting terminal;

The channel decoding module is used to carry out corresponding channel decoding algorithm;

The information bit module is used for that receiving system is recovered information bit data sequence and passes to the upper application module processing.

5. broadband single-carrier/multi-carrier equalizing receiver according to claim 1 and 2 is characterized in that, described multi-carrier signal recovers/separates frame module and comprises successively and to connect:

Multichannel time-domain filtering module, its output with the frequency domain equalization module is connected, and is used for multi-carrier transmission signal is carried out sub-band filter;

The FFT conversion module, it carries out fast fourier transform to filtered signal;

Parallel/serial modular converter, it is used for the parallel data sequence transformation of input is become the dateout sequence of serial;

Separate the mapping de-interleaving block, be used for the data sequence of input being separated and be mapped to the corresponding digital sequence, and carry out the bit deinterleaving according to the sign map rule of transmitting terminal;

The channel decoding module is used to carry out corresponding channel decoding algorithm;

The information bit module is used for that receiving system is recovered information bit data sequence and passes to the upper application module processing.

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