CN103944842A - Channel equalization method and communication equipment - Google Patents

Abstract

The invention relates to the communication field and discloses a channel equalization method and communication equipment. The method comprises steps: a receiver receives information of modulation factors, wherein the modulation factors comprise pilot modulation factors and data modulation factors; the receiver receives communication signals, wherein the communication signals comprise pilot signals and data signals; the receiver acquires initial channel state information of the channel where the communication signals pass according to the received pilot signals, the known pilot transmission signals and the pilot modulation factors; the receiver adjusts the initial channel state information according to the data modulation factors and the pilot modulation factors to obtain each piece of final channel state information of the channel; and the receiver carries out channel equalization on the received data signals according to each piece of final channel state information and carries out demodulation and recovery to obtain the transmission signals of the data signals. when the technical scheme is applied, accuracy of channel equalization can be improved, and the data communication effects are improved.

Description

Channel equalization method and communication device

Technical Field

The present invention relates to the field of communications, and in particular, to a channel equalization method and a communication device for mimo communications.

Background

The performance of a wireless communication system is greatly affected by wireless channels, such as shadow fading and frequency selective fading, so that the propagation path between a transmitter and a receiver is very complicated. Wireless channels are not fixed and predictable as wired channels, but rather have a large degree of randomness, which presents a significant challenge to the design of a receiver.

In the existing communication system, in order to accurately recover the transmission signal of the transmitting end at the receiving end, people adopt various measures to resist the influence of the multipath effect on the transmission signal, and therefore, when receiving information, the parameters of the Channel are estimated to obtain accurate Channel state information, and then Channel Equalization (Channel Equalization) is performed at the receiving end by using the accurate Channel state information to correctly demodulate the transmission signal of the data signal.

The current channel estimation method mainly comprises the following steps: adding a Pilot Signal (Pilot Signal) with a certain length in a data Signal, wherein a transmitting Signal of the Pilot Signal is predetermined by a network protocol, and a receiver calculates and estimates channel state information of a current channel according to a receiving Signal of the Pilot Signal in the received Signal and a Pilot Signal transmitting value predicted by the receiver according to the following functional formula (1):

<math> <mrow> <mover> <mi>h</mi> <mo>^</mo> </mover> <mo>=</mo> <mover> <mi>r</mi> <mo>&OverBar;</mo> </mover> <mo>/</mo> <mi>p</mi> <mo>,</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </math>

wherein,r is a received value of a pilot signal received by the receiver, and p is a transmitted value of the pilot signal known to the receiver.

After a receiving end obtains channel state parameters according to pilot signals, the channel state parameters are applied to carry out channel equalization, and the channel equalization is mainly carried out according to the following function:and carrying out recovery equalization on the received data signal so as to demodulate and recover a transmission signal of the data signal, wherein S is the transmission signal of the data signal, and r is a receiving signal of the data signal.

Because the modulation coefficients corresponding to different signal modulation modes in signal modulation are different, in the data channel equalization in the prior art, the data signal and the pilot signal adopt the same modulation mode, thereby avoiding the error of channel estimation caused by different modulation coefficients in the data transmission process.

In addition, in the prior art, in order to ensure the accuracy of the pilot signal, it is determined that the pilot signal generally adopts a modulation method of low order modulation, and meanwhile, as the data communication technology develops, data that needs to be transmitted becomes larger, and modulating the data signal by adopting the low order modulation method is not favorable for the full application of wireless resources, and easily causes a large amount of wireless network data, which affects the efficiency of network transmission.

Disclosure of Invention

A first objective of embodiments of the present invention is to provide a channel equalization method, which can improve accuracy of channel equalization and improve data communication effect.

A second object of the embodiments of the present invention is to provide a communication device, which can improve accuracy of channel equalization and improve data communication effect.

A third objective of the embodiments of the present invention is to provide another communication device, which can improve accuracy of channel equalization and improve data communication effect.

In a first aspect, a channel equalization method provided in an embodiment of the present invention includes:

the receiver receives information of modulation coefficients, the modulation coefficients comprising: pilot modulation coefficients, and data modulation coefficients;

a receiver receives a communication signal, the communication signal comprising: a pilot signal and a data signal;

the receiver obtains the initial channel state information of the channel through which the communication signal passes according to the received pilot signal, the known pilot frequency transmitting signal and the pilot frequency modulation coefficient;

the receiver adjusts the initial channel state information according to the data modulation coefficient and the pilot frequency modulation coefficient to obtain each final channel state information of the channel;

and the receiver performs channel equalization on the received data signals according to the final channel state information, and demodulates and recovers the received data signals to obtain the transmitting signals of the data signals.

With reference to the first aspect, in a first implementation manner, the communication signal is: a multiple-input multiple-output communication signal;

the method comprises the following steps: obtaining initial channel state information of a channel through which the communication signal passes according to the received pilot signal, the known pilot emission signal and the pilot modulation coefficient, including:

the receiver calculates and obtains initial channel state information of a first channel and a second channel corresponding to each receiving antenna of the receiver according to the following functional formula:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the ith receiving corresponding antenna pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna of the receiver,

the above-mentionedAre respectively as: initial channel state information of the first channel and the second channel of an ith receiving antenna;

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the ith receiving antenna receives the pilot signals in the first channel and the second channel, wherein N is the serial number of any subcarrier of the pilot signals, and N is the subcarrier length of the pilot signals.

With reference to the first aspect, in a first implementation manner, the method includes: the receiver adjusts the initial channel state information according to the data modulation coefficient and the pilot modulation coefficient to obtain each final channel state information of the channel, and the method comprises the following steps:

obtaining the final channel state information of the first channel and the second channel corresponding to the ith receiving antenna according to the following functional formula

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

The R is₁Comprises the following steps: the data modulation factor.

With reference to the first aspect, in a first implementation manner, the pilot modulation coefficient is obtained by a transmitter through calculation according to a predetermined algorithm based on hardware configuration information of the transmitter; or,

and the pilot frequency modulation coefficient is obtained by the transmitter through calculation according to a preset algorithm according to the hardware configuration information of the transmitter and the current actual channel estimation state information fed back by the receiver.

With reference to the first aspect, in a first implementation manner, the mimo signal is: an orthogonal frequency division multiplexing signal, or a single carrier signal.

In a second aspect, an embodiment of the present invention provides a communication device, including: an antenna for transmitting and receiving signals, the received signals comprising: receiving externally transmitted information of the modulation factor and transmitting a communication signal,

the modulation coefficients include: pilot modulation coefficients, and data modulation coefficients,

the communication signal includes: a pilot signal and a data signal;

a storage unit, configured to store the pilot modulation coefficients, the data modulation coefficients, and each of the known pilot signals;

a channel estimation unit, configured to obtain initial channel state information of a channel through which the communication signal passes according to the received pilot signal, a known pilot transmission signal, and the pilot modulation coefficient;

a channel state information adjusting unit, configured to adjust the initial channel state information according to the data modulation coefficient and the pilot modulation coefficient, and obtain each final channel state information of the channel;

and the channel equalization unit is used for performing channel equalization on the received data signals according to the final channel state information, and demodulating and recovering to obtain the transmitting signals of the data signals.

With reference to the second aspect, in a first implementation manner, the number of the antennas is at least two,

the channel estimation unit is specifically configured to calculate and obtain initial channel state information of a first channel and a second channel corresponding to each receiving antenna of the receiver according to the following functional expression:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the ith receiving corresponding antenna pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of an ith receiving antenna;

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the pilot signals received by the ith receiving antenna on the first channel and the second channel, where n is the pilot signalAnd any subcarrier serial number of the frequency signal, wherein N is the subcarrier length of the pilot signal.

With reference to the second aspect, in a first implementation manner, the channel state information adjusting unit is specifically configured to obtain final channel state information of the first channel and the second channel corresponding to the ith receiving antenna according to the following function

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

The R is₁Comprises the following steps: the data modulation factor is a function of the data modulation factor,

the R is₁For the purpose of the pilot modulation coefficients,

the above-mentionedRespectively as follows: and initial channel state information of the first channel and the second channel of the ith receiving antenna.

In a third aspect, an embodiment of the present invention provides a communication device, including:

an antenna for transmitting and receiving signals, the received signals comprising: receiving externally transmitted information of the modulation factor and transmitting a communication signal,

the modulation coefficients include: pilot modulation coefficients, and data modulation coefficients,

the communication signal includes: a pilot signal and a data signal;

a memory for storing the pilot modulation coefficients, data modulation coefficients, and each of the known pilot signals;

a channel estimator, configured to obtain initial channel state information of a channel through which the communication signal passes according to the received pilot signal, a known pilot transmission signal, and the pilot modulation coefficient;

a channel state information adjuster, configured to adjust the initial channel state information according to the data modulation coefficient and the pilot modulation coefficient, and obtain each final channel state information of the channel;

and the channel equalizer is used for performing channel equalization on the received data signals according to the final channel state information, and demodulating and recovering to obtain the transmitting signals of the data signals.

With reference to the first implementation manner of the third aspect, in the first implementation manner,

the number of the antennas is at least two,

the channel estimator is specifically configured to calculate and obtain initial channel state information of a first channel and a second channel corresponding to each receiving antenna of the receiver according to the following functional expression:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the ith receiving corresponding antenna pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of an ith receiving antenna;

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the ith receiving antenna receives the pilot signals in the first channel and the second channel, wherein N is the serial number of any subcarrier of the pilot signals, and N is the subcarrier length of the pilot signals.

With reference to the first implementation manner of the third aspect, in a third implementation manner, the channel state information adjuster is specifically configured to obtain final channel state information of the first channel and the second channel corresponding to the ith receiving antenna according to the following functional formula

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

The R is₁Comprises the following steps: the data modulation factor is a function of the data modulation factor,

the R is₁For the purpose of the pilot modulation coefficients,

the above-mentionedRespectively as follows: and initial channel state information of the first channel and the second channel of the ith receiving antenna.

As can be seen from the above, with the technical solution of this embodiment, since the receiver in this embodiment further receives the pilot modulation coefficient corresponding to the pilot signal and the data modulation coefficient corresponding to the data signal before receiving the communication signal including the pilot signal and the data signal, when performing channel estimation, the receiver can perform channel estimation on a channel through which the communication signal passes according to the received pilot signal and the known pilot transmission signal corresponding to the pilot signal, specifically according to the pilot modulation coefficient, to obtain CSI of the channel, which is denoted as initial CSI, after the initial CSI of the channel is obtained according to the pilot signal, the initial CSI is further adjusted according to the received pilot modulation coefficient and data modulation coefficient, to obtain the adjusted final CSI, so as to eliminate the extra demodulation error caused by the difference between the pilot modulation coefficient and the data modulation coefficient in the communication signal in the embodiment to the channel equalization of the data signal.

In summary, the limitations of the present invention are seen relative to the pilot signal and data signal of the same modulation inherent in the prior art. The technical scheme of the embodiment is beneficial to breaking through the inherent limit that the pilot signal and the data signal need to adopt the same modulation, so that the pilot signal modulation and the data signal modulation can be respectively executed according to the respective modulation, demodulation and transmission requirements of the pilot signal and the data signal, and the extra error brought to the channel equalization of the data signal due to the inconsistency of the pilot signal, the pilot modulation coefficient and the data modulation coefficient of the data signal in the communication signal can be eliminated at the receiving end according to the pilot modulation coefficient and the data modulation coefficient which are transmitted by the transmitter in advance during the channel estimation, thereby ensuring the accuracy of the channel equalization of the data signal.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic flowchart of a channel equalization method for mimo communication according to embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a Single RF antenna according to embodiment 2 of the present invention;

FIG. 3 shows the gain B of the transmitted signal in the Single RF antenna according to embodiment 2 of the present invention₀(θ)、B₁(θ)、B₂(θ) a graph of amplitude information;

fig. 4 is a schematic flowchart of a channel equalization method for mimo communication according to embodiment 2 of the present invention;

fig. 5 is a schematic structural diagram of a communication device according to embodiment 3 of the present invention;

fig. 6 is a schematic structural diagram of a communication device according to embodiment 4 of the present invention;

fig. 7 is a schematic structural diagram of a communication device according to embodiment 5 of the present invention;

fig. 8 is a schematic structural diagram of a communication device according to embodiment 6 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1, the present embodiment provides a channel equalization method for mimo communication, where the method mainly includes the following steps:

step 101: the receiver receives the modulation coefficient information.

In this embodiment, before transmitting a communication signal including a service data signal and a pilot signal, a transmitter first transmits modulation coefficient information corresponding to a communication to be transmitted to a receiver at an opposite end, so that the receiver receives the modulation coefficient information corresponding to the communication signal before receiving the communication signal.

The modulation factor includes: pilot modulation coefficients, and data modulation coefficients. The pilot modulation coefficient is a modulation coefficient adopted by the transmitter when modulating the pilot signal in the communication signal, and the data modulation coefficient is a modulation coefficient adopted by the transmitter when modulating the data signal in the communication signal.

In this embodiment, when the communication signal is modulated, the modulation method of the pilot signal located before the data signal and the modulation method of the data signal are independent of each other, and it is not necessary to perform signal modulation in accordance with the same modulation method and the same modulation coefficient.

Such as: the pilot signal in the communication signal of this embodiment may be, but not limited to, Binary Phase Shift Keying (BPSK) Modulation, and the Modulation coefficient thereof is R0, and the data signal employs Quadrature Amplitude Modulation (QAM), and the Modulation coefficient thereof is R1.

Step 102: a receiver receives a communication signal.

And after the transmitter transmits the modulation coefficient information corresponding to the current communication signal to be transmitted to the receiver, the transmitter transmits the communication signal.

At the receiver, the receiver receives the communication signal, the communication signal frame includes a pilot signal and a data signal after the pilot signal, and the frame structure is as follows:

pilot signal

Data signal

Step 103: the receiver obtains initial channel state information of each channel through which the communication signal passes according to the received pilot signal, the known pilot signal and the pilot modulation coefficient.

After receiving the communication signal, the receiver performs Channel estimation on a Channel through which the communication signal passes according to a pilot signal in the received communication signal, a known pilot transmitting signal corresponding to the pilot signal, and a pilot coefficient, to obtain initial Channel State Information (CSI) of the Channel.

Step 104: and the receiver adjusts each initial channel state information of each channel according to the data modulation coefficient and the pilot frequency modulation coefficient to obtain each final channel state information of each channel through which the communication signal passes.

After the receiver performs channel estimation according to the pilot signal in the communication signal to obtain the initial CSI, the initial CSI of the channel is further adjusted according to the pilot modulation coefficient and the data modulation coefficient in this step to eliminate additional deviation caused by different pilot modulation coefficients and data modulation coefficients to channel equalization. In this step, the initial CSI is further adjusted by using the data modulation coefficient and the pilot modulation coefficient, and the adjusted final CSI is obtained, so as to perform channel equalization on the data signal by using the final CSI.

Step 105: and the receiver performs channel equalization on the data signal according to the final channel state information, and demodulates and recovers the transmitting signal of the data signal.

And the receiver applies the adjusted final CSI to perform channel equalization on the data signal in the communication signal, and demodulates the data signal to obtain a transmitting signal of the data signal.

The specific channel equalization method can refer to any channel equalization technical scheme in the prior art without limitation.

As can be seen from the above, with the technical solution of this embodiment, since the receiver in this embodiment further receives the pilot modulation coefficient corresponding to the pilot signal and the data modulation coefficient corresponding to the data signal before receiving the communication signal including the pilot signal and the data signal, when performing channel estimation, the receiver can perform channel estimation on a channel through which the communication signal passes according to the received pilot signal and the known pilot transmission signal corresponding to the pilot signal, specifically according to the pilot modulation coefficient, to obtain CSI of the channel, which is denoted as initial CSI, after the initial CSI of the channel is obtained according to the pilot signal, the initial CSI is further adjusted according to the received pilot modulation coefficient and data modulation coefficient, to obtain the adjusted final CSI, so as to eliminate the extra demodulation error caused by the difference between the pilot modulation coefficient and the data modulation coefficient in the communication signal in the embodiment to the channel equalization of the data signal.

In summary, the limitations of the present invention are seen relative to the pilot signal and data signal of the same modulation inherent in the prior art. The technical scheme of the embodiment is beneficial to breaking through the inherent limit that the pilot signal and the data signal need to adopt the same modulation, so that the pilot signal modulation and the data signal modulation can be respectively executed according to the respective modulation, demodulation and transmission requirements of the pilot signal and the data signal, and the extra error brought to the channel equalization of the data signal due to the inconsistency of the pilot signal, the pilot modulation coefficient and the data modulation coefficient of the data signal in the communication signal can be eliminated at the receiving end according to the pilot modulation coefficient and the data modulation coefficient which are transmitted by the transmitter in advance during the channel estimation, thereby ensuring the accuracy of the channel equalization of the data signal.

Example 2:

this embodiment takes how to receive a MIMO signal sent by a single radio frequency channel MIMO (single RF MIMO) transmitter and perform channel equalization on the received MIMO signal as an example, and further analyzes the technical solution of the present invention in detail.

A Single RF MIMO transmitter has only one radio link channel. In a Single RF mimo network, the structure of its Single RF antenna is shown in fig. 2.

As shown in fig. 2, in the Single RF MIMO communication device, only one antenna entity 201, also called antenna excitation element 201 (active element), is provided, and the antenna excitation element 201 can send and receive signals through a radio frequency link and receive signals from a baseband, as shown in S0;

two parasitic elements 202 (parasiticetlements) are symmetrically arranged beside the antenna excitation element 201. Each parasitic array 202, without a radio frequency link, cannot transmit and receive signals directly, but by adjusting its own Reactance (Reactance, shown as xL in the figure)₁，xL₂) While adjusting the mode in which the signal is transmitted. The distance between each parasitic element 202 and the excitation element 201 is fixed as d:. And theta is an included angle between the incident signal and the antenna array. A control circuit 203 is arranged in front of each parasitic array 202, and the input signal s can be adjusted by adjusting the control circuit 203₀，s₁The reactance of the parasitic elements 202 is realized and thus the data transmission is realized by adjusting the coupling between each parasitic element 202 and the excitation element 201. The data stream transmitted in the Single RF MIMO system is mainly two data streams, one data stream is transmitted by the radio frequency link; the other data stream is realized by coupling between the parasitic element 202 and the excited element 201.

For the ingle RF antenna structure shown in fig. 2, the far field signal with an exit angle θ is denoted as G (θ), which can be expressed as:

wherein,

$X=\left[\begin{array}{ccc}{Z}_s& 0& 0\\ 0& {\mathrm{jX}}_{L1}& 0\\ 0& 0& {\mathrm{jX}}_{L2}\end{array}\right],$

wherein Z is_sIs the source impedance (source impedance), xL, of the parasitic array 202₁，xL₂The adjustable inductances of the parasitic array 202 located beside the excitation array 201 in fig. 2 are respectively, and j represents an imaginary number;

$Z=\left[\begin{array}{ccc}{Z}_{00}& Z_{01}& Z_{02}\\ Z_{10}& Z_{11}& Z_{12}\\ Z_{20}& Z_{21}& Z_{21}\end{array}\right],$ wherein Z_iiIs the self-impedance, Z, of either the excited element 201 or the parasitic element 202_ijTo obtain mutual impedance between the excitation array 201 or the parasitic array 202, i, j is 0, 1, 2. After the structure of the antenna array is determined, the value of z can be obtained according to the circuit principle and the prior art;

λ is the wavelength; v. of_sTo represent the antenna gain, its value can be adjusted by the amplifier of the radio frequency link.

Further expansion of the functional formula (1) can yield:

gain B of the transmitted signal in the above function (2)₀(θ)、B₁(θ)、B₂The amplitude information of (theta) is shown in FIG. 3, where

As can be seen from FIG. 3, from the figureAs can be seen, B₀(theta) and B₁(θ) substantially uniform by calculating B₀(theta) and B₁The energy distribution between (θ) can be obtained as:

wherein the ratio of c =0.9612,

also, as can be derived from the figure and calculation, B₂(theta) and B₀(theta) and B₁(θ) are orthogonal, respectively.

Substituting functional formula (3) into functional formula (2) can obtain functional formula (4):

from the functional formula (4), we see that we can adjust v_sMake xL₁、xL₂The following conditions are satisfied:

$s_0=\frac{v_s}{I_0+c(I_1+I_2)};$

$\mathrm{Rs}=j\frac{I_2-I_1}{I_0+(I_2+I_1)c}=R_0\frac{s_1}{s_0}.$

wherein R is₀The modulation coefficient is used for compensating two orthogonal gains B in the transmission signal in channel equalization₀(theta) and B₂Imbalance of power between (theta), taking R at ideal channel₀3.71. When the transmitting end carries out channel modulation, the modulation coefficient R₀The value of (a) is also determined by the transmitter hardware, and the value of the modulation factor that can be realized at the transmitting end is generally not a continuous value.

As can be seen from the above description, in the Single RF MIMO communication network of the present embodiment, the gain B due to the transmission signal₀(theta) and B₂(θ), so the transmission signal s in the functional formula (4)₀、s₁Can be regarded as reaching the receiver through mutually orthogonal channels, so that the receiving processing can be carried out by adopting the traditional MIMO mode at the receiving end. Put another way, in a Single RF MIMO communication network, B can be assigned₀(θ)、B₂(theta) are respectively regarded as two virtual transmitting antennas, and the data transmitted on each transmitting antenna is s₀And s₁. Correspond toIn the receiving end, any antenna receives data s₀And s₁。

The following further describes the implementation of the channel equalization scheme of the present invention in a Single RF MIMO communication network as an example:

the transmitter obtains a pilot modulation coefficient, denoted as R, to be used when modulating the pilot signal according to its hardware measurement (which may also be, but is not limited to, combining CSI of the channel between the current channel and the receiver)₀The data modulation factor to be used when obtaining the modulated data signal is denoted as R₁. The transmitter sends modulation coefficient information to the receiver to inform the receiving end of the current pilot frequency modulation coefficient and data modulation coefficient. The manner in which the transmitter sends the modulation factor information to the receiver may be, but is not limited to, signaling or notification.

The transmitter uses the pilot modulation factor R₀And a data modulation factor R₁And performing signal modulation. The frame structure obtained by modulation is as follows:

pilot signal P (n)

Data signal

The data length N of the pilot signal and the length of the data length M of the data signal in this embodiment can be set as needed. For example, but not limited to, the architecture is compatible with Long Term Evolution (LTE), where N is 144 and M is 4048.

When the transmitter modulates and encodes the pilot signal, the pilot signal may be, but is not limited to, signal-modulated by using Quadrature Phase Shift Keying (QPSK) or Binary Phase Shift Keying (BPSK), so as to ensure the accuracy of channel estimation according to the pilot signal.

The transmitter selects a determined modulation mode according to the traffic demand of the current data signal and the network requirement to modulate the data signal, wherein the modulation mode may be, but is not limited to, QPSK or BPSK modulation, and the modulation order may be, but is not limited to, higher than the modulation order of the pilot signal.

As shown in functional formula (4), pilot p in the Single RF MIMO network system of the present embodiment₁(n) and p₂(n) the construction is as follows:

<math> <mrow> <mi>p</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>B</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mfrac> <mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <msub> <mi>B</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>)</mo> </mrow> <mo>)</mo> </mrow> </mrow> </math>

wherein B is₀(theta) and B₂And (theta) is the transmission gain of two orthogonal channels in an orthogonal antenna directional diagram, and p (n) is a pseudo-random sequence which can be used for channel estimation and synchronization. B is₀(θ)，B₂(theta) and R₀Respectively according to the reactance values xL generated in advance₁，xL₂And (4) generating.

Referring to fig. 4, at the receiver, the processing flow of the receiver mainly includes the following steps:

step 401: the receiver receives the modulation coefficient information.

This step is the same as step 101 in example 1.

Step 402: the receiver receives a MIMO signal.

This embodiment takes as an example that the receiver has 2 antennas (first antenna, second antenna), and the case of reception of MIMO signals by a receiver having more than 2 antennas is similar.

For the first antenna, the transmission signal gain B of the antenna pattern corresponding to the first antenna₀(theta) and B₂The channels of (theta) are respectively h₁₁And h₁₂The first antenna passes through channel h₁₁And channel h₁₂The two pilot signal streams received respectively can be expressed as a function (5):

$\left(\begin{array}{c}{r}_{11}\left(n\right)=p_1\left(n\right)h_{11}+p_2\left(n\right){R0h}_{12}\\ r_{12}\left(n\right)=p_1\left(n\right)h_{11}+p_2\left(n\right){R0h}_{12}\end{array}\right.,---\left(5\right)$

wherein p is₁(n)、p₂(n) are respectively: two pilot transmission signal streams, R, from the transmitter, known to the receiver₀Is pilot frequency modulation coefficient, n is pilot frequency sequence number, h in the above formula₁₁、h₁₂Are respectively a channel h₁₁、h₁₂Of (3) is determined.

Similarly, the transmission signal gain B of the antenna pattern corresponding to the second antenna₀(theta) and B₂The channels of (theta) are respectively h₂₁、h₂₂The first antenna passes through channel h₂₁And channel h₂₂The two pilot signal streams received respectively can be expressed as a function (5'):

$\left(\begin{array}{c}{r}_{21}\left(n\right)=p_1\left(n\right)h_{21}+p_2\left(n\right){R0h}_{22}\\ r_{22}\left(n\right)=p_1\left(n\right)h_{21}+p_2\left(n\right){R0h}_{22}\end{array}\right.,---\left(5^{\text{'}}\right),$

step 403: the receiver obtains initial channel state information of each channel through which the MIMO signal passes according to the received pilot signal, the known pilot signal and the pilot modulation coefficient.

For a first antenna of the receiver, time-domain correlating function (5) yields function (6):

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>11</mn> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>11</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>11</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>12</mn> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>12</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>12</mn> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>11</mn> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>11</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>11</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>12</mn> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>12</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>12</mn> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math>

obtaining channel h according to function (6)₁₁、h₁₂Of the CSI estimateSee the following functional formula:

$\left\{\begin{array}{c}{\hat{h}}_{11}=\frac{{{\hat{r}}_{11}}^{\left(1\right)}+{{\hat{r}}_{12}}^{\left(1\right)}}{2}\\ {\hat{h}}_{12}=\frac{{{\hat{r}}_{11}}^{\left(2\right)}+{{\hat{r}}_{12}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,---\left(6\right),$

for the second antenna of the receiver, time-domain correlating the function (5 ') to obtain a function (6'):

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>21</mn> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>21</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>21</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>22</mn> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>22</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>22</mn> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>21</mn> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>21</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>21</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mn>22</mn> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mn>22</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mn>22</mn> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <msup> <mn>6</mn> <mo>'</mo> </msup> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math>

obtaining the channel h according to the function (6₂₁、h₂₂Of the CSI estimateSee the following functional formula:

$\left\{\begin{array}{c}{\hat{h}}_{21}=\frac{{{\hat{r}}_{21}}^{\left(1\right)}+{{\hat{r}}_{22}}^{\left(1\right)}}{2}\\ {\hat{h}}_{22}=\frac{{{\hat{r}}_{21}}^{\left(2\right)}+{{\hat{r}}_{22}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,---\left(6^{\text{'}}\right),$

therefore, the pilot signals received by each antenna of the receiver are used to obtain the antenna pattern B corresponding to each antenna₀(theta) and B₂Initial CSI of the channel of (θ).

Step 404: and the receiver adjusts each initial channel state information of each channel according to the data modulation coefficient and the pilot modulation coefficient to obtain each final channel state information of each channel through which the MIMO signal passes.

In this embodiment, due to the limitation of the Single RF MIMO architecture itself, the modulation coefficients at the time of pilot signal and data signal modulation are different, and at the receiver side, the receiver transmits a signal p using the first pilot₁(n) and a second pilot transmission signal p₂(n) each channel h obtained₁₁、h₁₂、h₂₁、h₂₂After the initial CSI, each channel h is further processed in this step₁₁、h₁₂、h₂₁、h₂₂Is adjusted according to the following function (7), and a channel h is obtained₁₁、h₁₂、h₂₁、h₂₂Final CSI of (a): and

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mn>11</mn> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mn>11</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mn>12</mn> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mn>12</mn> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mn>21</mn> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mn>21</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mn>22</mn> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mn>21</mn> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> <mo>,</mo> </mrow> </math>

step 405: and the receiver performs channel equalization on the data signal according to the final channel state information, and demodulates and recovers the transmitting signal of the data signal.

And after the adjusted final CSI of each channel is obtained, carrying out channel equalization on the data signal according to the CSI of each channel, and demodulating and recovering a transmitting signal of the data signal. This step may be performed, but is not limited to, using existing techniques.

As can be seen from the above, in addition to the beneficial effects of embodiment 1, the application of the technical solution of this embodiment is also particularly suitable for a Single RF MIMO radio frequency architecture, and ensures that in the Single RF MIMO radio frequency architecture, due to the inherent hardware limitation of the Single RF MIMO radio frequency architecture, a pilot modulation coefficient is inconsistent with a data modulation coefficient, thereby eliminating an additional error brought to channel equalization of a data signal due to inconsistency between the pilot modulation coefficient and the data modulation coefficient in the MIMO signal, and ensuring accuracy of the channel equalization in this situation.

It should be noted that the MIMO signal in the present embodiment may be, but not limited to, a single-carrier signal, or a multi-carrier signal, such as an Orthogonal Frequency Division Multiplexing (OFDM) signal. The technical scheme of performing the CSI estimation and CSI adjustment of each channel according to the pilot signal is the same as the above.

Example 3:

referring to fig. 5, the present embodiment provides a communication apparatus mainly including the following components: antenna 501, storage section 502, channel estimation section 503, channel state information adjustment section 504, and channel equalization section 505. The connection relation and the working principle of each part are as follows:

the antenna 501 is a radio frequency component of the communication device, and is used for transmitting and receiving signals.

In this embodiment, the signal received by the communication device through the antenna 501 includes: the receiving transmitter transmits modulation factor information to the communication device before transmitting a signal containing a pilot signal and a data signal, wherein the modulation factor information includes: pilot modulation coefficients, and data modulation coefficients. When receiving the modulation factor information, the antenna 501 stores the pilot modulation factor and the data modulation factor in the storage unit 502.

The communication information number received by the antenna 501 of the communication device as a receiving end further comprises: the communication signal includes a pilot signal and a data signal, where the pilot signal and the data signal correspond to a pilot modulation coefficient and a data modulation coefficient, which may be different, but not limited to different.

The storage unit 502 is used for storing data, and the stored data includes: the receiver receives a pilot signal and a data signal in a communication signal to be received, wherein the pilot signal and the data signal respectively comprise a pilot modulation coefficient, a data modulation coefficient and a pilot emission signal of the pilot signal in the communication signal to be received.

The channel estimation unit 503 is connected to the antenna 501, and configured to perform channel estimation on a signal-to-interference ratio of the signal according to the pilot modulation coefficient, the pilot transmission signal, and the currently received pilot signal stored in the storage unit 502 after the antenna 501 receives the communication signal including the pilot signal and the data signal, and obtain initial CSI of each channel. The further principle can be, but is not limited to, the descriptions of step 103 and step 403 in embodiments 1 and 2.

Channel state information adjusting section 504 is electrically connected to channel estimating section 503, and is configured to adjust CSI of each channel according to the pilot modulation coefficient and the data modulation coefficient stored in storage section 502 after channel estimating section 503 obtains initial CSI of each channel, obtain final CSI of each channel, and input the final CSI of each channel to channel equalizing section 505.

And a channel equalization unit 505, electrically connected to the antenna 501 and the channel state information adjustment unit 504, respectively, and configured to perform channel equalization on the data signal in the communication signal received by the current antenna 501 according to the final CSI of each channel, and demodulate and recover the data signal to obtain a transmission signal of the data signal.

As can be seen from the above, with the technical solution of this embodiment, since the communication device in this embodiment further receives the pilot modulation coefficient corresponding to the pilot signal and the data modulation coefficient corresponding to the data signal before receiving the communication signal including the pilot signal and the data signal, and prestores the pilot modulation coefficient and the data modulation coefficient in the storage unit 502, when the channel estimation unit 503 performs channel estimation, the channel estimation may be performed on the channel through which the communication signal passes according to the received pilot signal and the known pilot transmission signal corresponding to the pilot signal specifically according to the pilot modulation coefficient, so as to obtain CSI of the channel, which is denoted as initial CSI, after the channel estimation unit 503 obtains the initial CSI of the channel according to the pilot signal, the channel state information adjustment unit 504 further adjusts the initial CSI according to the received pilot modulation coefficient and data modulation coefficient, to obtain the adjusted final CSI, so as to eliminate the extra demodulation error caused by the difference between the pilot modulation coefficient and the data modulation coefficient in the communication signal in the embodiment to the channel equalization of the data signal.

In summary, the limitations of the present invention are seen relative to the pilot signal and data signal of the same modulation inherent in the prior art. The technical scheme of the embodiment can break through the inherent limit that the pilot signal and the data signal need to adopt the same modulation, so that the modulation of the pilot signal and the modulation of the data signal by the transmitting terminal can be respectively executed according to the respective modulation, demodulation and transmission requirements of the pilot signal and the data signal, and the communication equipment can eliminate extra errors brought to the channel equalization of the data signal due to the inconsistency of the pilot modulation coefficient and the data modulation coefficient of the pilot signal and the data signal in the communication signal during the channel estimation according to the pilot modulation coefficient and the data modulation coefficient which are transmitted by the transmitter in advance, thereby ensuring the accuracy of the channel equalization of the data signal.

Example 4:

referring to fig. 6, the present embodiment provides a communication device, which is different from embodiment 3 mainly in that:

at least two antennas 601 are provided in the communication device of this embodiment, which is a multiple-input multiple-output communication device.

As a detailed description of embodiment 1, the channel estimation unit 605 in the communication device of this embodiment is specifically configured to calculate and obtain initial channel state information of the first channel and the second channel corresponding to each receiving antenna 601 of the receiver according to the following functional formula:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the i-th receiving corresponding antenna 601 pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna 601 of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of the ith receiving antenna 601,

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the pilot signals received by the ith receiving antenna 601 in the first channel and the second channel, where N is a serial number of any subcarrier of the pilot signals, and N is a length of a subcarrier of the pilot signals.

As a detailed description of embodiment 1, the channel state information adjusting unit 604 in the communication device of this embodiment is specifically configured to obtain final channel state information of the first channel and the second channel corresponding to the ith receiving antenna 601 according to the following functional formula

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math> Wherein R is₁Comprises the following steps: number ofAccording to the modulation factor.

As can be seen from the above, by applying the technical solution of this embodiment, in addition to the beneficial effects described in embodiment 3, the communication device of this embodiment is further particularly suitable for an MIMO communication network, and is particularly suitable for receiving an MIMO signal from a Single RF MIMO radio frequency architecture, so as to ensure that a pilot modulation coefficient is inconsistent with a data modulation coefficient due to the inherent hardware limitation of the Single RF MIMO radio frequency architecture in the Single RF MIMO radio frequency architecture, eliminate an additional error caused by the inconsistency of the pilot modulation coefficient and the data modulation coefficient in the MIMO signal to channel equalization of a data signal, ensure accuracy of channel equalization in this situation, and improve communication effects due to popularization of application of the Single RF MIMO radio frequency architecture.

Example 5:

referring to fig. 7, the present embodiment provides a communication apparatus mainly including the following components: antenna 501, memory 702, channel estimator 703, channel state information adjuster 704, and channel equalizer 705. The connection relation and the working principle of each part are as follows:

the antenna 501 is a radio frequency component of the communication device, and is used for transmitting and receiving signals.

In this embodiment, the signal received by the communication device through the antenna 501 includes: the receiving transmitter transmits modulation factor information to the communication device before transmitting a signal containing a pilot signal and a data signal, wherein the modulation factor information includes: pilot modulation coefficients, and data modulation coefficients. Upon receiving the modulation factor information, the antenna 501 stores the pilot modulation factor and the data modulation factor in the memory 702.

The communication information number received by the antenna 501 of the communication device as a receiving end further comprises: the communication signal includes a pilot signal and a data signal, where the pilot signal and the data signal correspond to a pilot modulation coefficient and a data modulation coefficient, which may be different, but not limited to different.

The memory 702 is used for storing data, which includes: the receiver receives a pilot signal and a data signal in a communication signal to be received, wherein the pilot signal and the data signal respectively comprise a pilot modulation coefficient, a data modulation coefficient and a pilot emission signal of the pilot signal in the communication signal to be received.

The channel estimator 703 is connected to the antenna 501, and configured to perform channel estimation on a signal passing through the signal according to the pilot modulation coefficient, the pilot transmission signal, and the currently received pilot signal stored in the memory 702 after the antenna 501 receives the communication signal including the pilot signal and the data signal, and obtain initial CSI of each channel. The further principle can be, but is not limited to, the descriptions of step 103 and step 403 in embodiments 1 and 2.

And a channel state information adjuster 704, electrically connected to the channel estimator 703, for adjusting CSI of each channel according to the pilot modulation coefficient and the data modulation coefficient stored in the memory 702 after the channel estimator 703 obtains initial CSI of each channel, obtaining final CSI of each channel, and inputting the final CSI of each channel to the channel equalizer 705.

The channel equalizer 705 is electrically connected to the antenna 501 and the channel state information adjuster 704, and configured to perform channel equalization on a data signal in the communication signal received by the antenna 501 according to the final CSI of each channel, and demodulate and recover the data signal to obtain a transmission signal of the data signal.

As can be seen from the above, with the technical solution of this embodiment, since the communication device in this embodiment further receives the pilot modulation coefficient corresponding to the pilot signal and the data modulation coefficient corresponding to the data signal before receiving the communication signal including the pilot signal and the data signal, and prestores the pilot modulation coefficient and the data modulation coefficient in the memory 702, when performing channel estimation by the channel estimator 703, the channel estimator may perform channel estimation on a channel through which the communication signal passes according to the received pilot signal and the known pilot transmission signal corresponding to the pilot signal specifically according to the pilot modulation coefficient, obtain CSI of the channel, which is denoted as initial CSI, and after the channel estimator 703 obtains the initial CSI of the channel according to the pilot signal, the channel state information adjuster 704 further adjusts the initial CSI according to the received pilot modulation coefficient and data modulation coefficient, to obtain the adjusted final CSI, so as to eliminate the extra demodulation error caused by the difference between the pilot modulation coefficient and the data modulation coefficient in the communication signal in the embodiment to the channel equalization of the data signal.

In summary, the limitations of the present invention are seen relative to the pilot signal and data signal of the same modulation inherent in the prior art. The technical scheme of the embodiment can break through the inherent limit that the pilot signal and the data signal need to adopt the same modulation, so that the modulation of the pilot signal and the modulation of the data signal by the transmitting terminal can be respectively executed according to the respective modulation, demodulation and transmission requirements of the pilot signal and the data signal, and the communication equipment can eliminate extra errors brought to the channel equalization of the data signal due to the inconsistency of the pilot modulation coefficient and the data modulation coefficient of the pilot signal and the data signal in the communication signal during the channel estimation according to the pilot modulation coefficient and the data modulation coefficient which are transmitted by the transmitter in advance, thereby ensuring the accuracy of the channel equalization of the data signal.

Example 6:

referring to fig. 8, the present embodiment provides a communication device, which is different from embodiment 5 mainly in that:

at least two antennas 601 are provided in the communication device of this embodiment, which is a multiple-input multiple-output communication device.

As a further detailed description of embodiment 1, the channel estimator 805 in the communication device of this embodiment is specifically configured to calculate and obtain initial channel state information of the first channel and the second channel corresponding to each receiving antenna 601 of the receiver according to the following functional formula:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the i-th receiving corresponding antenna 601 pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna 601 of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of the ith receiving antenna 601,

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the pilot signals received by the ith receiving antenna 601 in the first channel and the second channel, where N is a serial number of any subcarrier of the pilot signals, and N is a length of a subcarrier of the pilot signals.

As a detailed description of embodiment 1, the channel state information adjuster 804 in the communication device of this embodiment is specifically configured to obtain final channel state information of the first channel and the second channel corresponding to the ith receiving antenna 601 according to the following functional formula

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math> Wherein R is₁Comprises the following steps: and (4) data modulation coefficients.

As can be seen from the above, by applying the technical solution of this embodiment, in addition to the beneficial effects described in embodiment 3, the communication device of this embodiment is further particularly suitable for an MIMO communication network, and is particularly suitable for receiving an MIMO signal from a Single RF MIMO radio frequency architecture, so as to ensure that a pilot modulation coefficient is inconsistent with a data modulation coefficient due to the inherent hardware limitation of the Single RF MIMO radio frequency architecture in the Single RF MIMO radio frequency architecture, eliminate an additional error caused by the inconsistency of the pilot modulation coefficient and the data modulation coefficient in the MIMO signal to channel equalization of a data signal, ensure accuracy of channel equalization in this situation, and improve communication effects due to popularization of application of the Single RF MIMO radio frequency architecture.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims (11)

1. A method for channel equalization, comprising:

the receiver receives information of modulation coefficients, the modulation coefficients comprising: pilot modulation coefficients, and data modulation coefficients;

a receiver receives a communication signal, the communication signal comprising: a pilot signal and a data signal;

the receiver obtains the initial channel state information of the channel through which the communication signal passes according to the received pilot signal, the known pilot frequency transmitting signal and the pilot frequency modulation coefficient;

the receiver adjusts the initial channel state information according to the data modulation coefficient and the pilot frequency modulation coefficient to obtain each final channel state information of the channel;

and the receiver performs channel equalization on the received data signals according to the final channel state information, and demodulates and recovers the received data signals to obtain the transmitting signals of the data signals.

2. The channel equalization method of claim 1,

the communication signals are: a multiple-input multiple-output communication signal;

the method comprises the following steps: obtaining initial channel state information of a channel through which the communication signal passes according to the received pilot signal, the known pilot emission signal and the pilot modulation coefficient, including:

the receiver calculates and obtains initial channel state information of a first channel and a second channel corresponding to each receiving antenna of the receiver according to the following functional formula:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the ith receiving corresponding antenna pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of an ith receiving antenna;

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the ith receiving antenna receives the pilot signals in the first channel and the second channel, wherein N is the serial number of any subcarrier of the pilot signals, and N is the subcarrier length of the pilot signals.

3. The channel equalization method of claim 2,

the method comprises the following steps: the receiver adjusts the initial channel state information according to the data modulation coefficient and the pilot modulation coefficient to obtain each final channel state information of the channel, and the method comprises the following steps:

obtaining the final channel state information of the first channel and the second channel corresponding to the ith receiving antenna according to the following functional formula

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

The R is₁Comprises the following steps: the data modulation factor.

4. The channel equalization method of claim 1,

the pilot frequency modulation coefficient is obtained by the transmitter through calculation according to the hardware configuration information of the transmitter and a preset algorithm; or,

and the pilot frequency modulation coefficient is obtained by the transmitter through calculation according to a preset algorithm according to the hardware configuration information of the transmitter and the current actual channel estimation state information fed back by the receiver.

5. The channel equalization method of claim 1,

the multiple-input multiple-output signal is: an orthogonal frequency division multiplexing signal, or a single carrier signal.

6. A communication device, comprising:

an antenna for transmitting and receiving signals, the received signals comprising: receiving externally transmitted information of the modulation factor and transmitting a communication signal,

the modulation coefficients include: pilot modulation coefficients, and data modulation coefficients,

the communication signal includes: a pilot signal and a data signal;

a storage unit, configured to store the pilot modulation coefficients, the data modulation coefficients, and each of the known pilot signals;

a channel estimation unit, configured to obtain initial channel state information of a channel through which the communication signal passes according to the received pilot signal, a known pilot transmission signal, and the pilot modulation coefficient;

a channel state information adjusting unit, configured to adjust the initial channel state information according to the data modulation coefficient and the pilot modulation coefficient, and obtain each final channel state information of the channel;

and the channel equalization unit is used for performing channel equalization on the received data signals according to the final channel state information, and demodulating and recovering to obtain the transmitting signals of the data signals.

7. The communication device of claim 6,

the number of the antennas is at least two,

the channel estimation unit is specifically configured to calculate and obtain initial channel state information of a first channel and a second channel corresponding to each receiving antenna of the receiver according to the following functional expression:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the ith receiving corresponding antenna pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of an ith receiving antenna;

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the ith receiving antenna receives the pilot signals in the first channel and the second channel, wherein N is the serial number of any subcarrier of the pilot signals, and N is the subcarrier length of the pilot signals.

8. The communication device of claim 6 or 7,

the channel state information adjusting unit is specifically configured to obtain final channel state information of the first channel and the second channel corresponding to the ith receiving antenna according to the following functional expression

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

The R is₁Comprises the following steps: the data modulation factor is a function of the data modulation factor,

the R is₁For the purpose of the pilot modulation coefficients,

the above-mentionedRespectively as follows: and initial channel state information of the first channel and the second channel of the ith receiving antenna.

9. A communication device, comprising:

an antenna for transmitting and receiving signals, the received signals comprising: receiving externally transmitted information of the modulation factor and transmitting a communication signal,

the modulation coefficients include: pilot modulation coefficients, and data modulation coefficients,

the communication signal includes: a pilot signal and a data signal;

a memory for storing the pilot modulation coefficients, data modulation coefficients, and each of the known pilot signals;

a channel estimator, configured to obtain initial channel state information of a channel through which the communication signal passes according to the received pilot signal, a known pilot transmission signal, and the pilot modulation coefficient;

a channel state information adjuster, configured to adjust the initial channel state information according to the data modulation coefficient and the pilot modulation coefficient, and obtain each final channel state information of the channel;

and the channel equalizer is used for performing channel equalization on the received data signals according to the final channel state information, and demodulating and recovering to obtain the transmitting signals of the data signals.

10. The communication device of claim 9,

the number of the antennas is at least two,

the channel estimator is specifically configured to calculate and obtain initial channel state information of a first channel and a second channel corresponding to each receiving antenna of the receiver according to the following functional expression:

$\left\{\begin{array}{c}{\hat{h}}_{i1}=\frac{{{\hat{r}}_{i1}}^{\left(1\right)}+{{\hat{r}}_{i2}}^{\left(1\right)}}{2}\\ {\hat{h}}_{i2}=\frac{{{\hat{r}}_{i1}}^{\left(2\right)}+{{\hat{r}}_{i2}}^{\left(2\right)}}{{2R}_0}\end{array}\right.,$

wherein, the first channel and the second channel are respectively the ith receiving corresponding antenna pattern emission signal gain B₀(theta), transmit signal gain B₂(theta) a corresponding one of the channels,

b is₀(θ)、B₂(theta) are orthogonal to each other,

the i is the serial number of the receiving antenna of the receiver,

the above-mentionedRespectively as follows: initial channel state information of the first channel and the second channel of an ith receiving antenna;

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msup> <msub> <mover> <mi>r</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>r</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <msub> <mi>p</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>&ap;</mo> <msub> <mi>h</mi> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>R</mi> <mn>0</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

the R is₀Comprises the following steps: the pilot frequency modulation coefficient is used for modulating the pilot frequency,

said r_i1(n)、r_i2(n) are respectively: the ith receiving antenna receives the pilot signals in the first channel and the second channel, wherein N is the serial number of any subcarrier of the pilot signals, and N is the subcarrier length of the pilot signals.

11. The communication device of claim 9 or 10,

the channel state information adjuster is specifically configured to obtain final channel state information of the first channel and the second channel corresponding to the ith receiving antenna according to the following function

<math> <mrow> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>1</mn> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mover> <mi>h</mi> <mo>&OverBar;</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>h</mi> <mo>^</mo> </mover> <mrow> <mi>i</mi> <mn>2</mn> </mrow> </msub> <mo>/</mo> <msub> <mi>R</mi> <mn>0</mn> </msub> <mo>*</mo> <msub> <mi>R</mi> <mn>1</mn> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow> </math>

The R is₁Comprises the following steps: the data modulation factor is a function of the data modulation factor,

the R is₁For the purpose of the pilot modulation coefficients,

the above-mentionedRespectively as follows: and initial channel state information of the first channel and the second channel of the ith receiving antenna.