HIGH-DIMENSIONAL SIGNAL TRANSMISSION METHOD

Abstract

A high-dimensional signal transmission method is provided. The method generates M M-dimensional first signals on the basis of M original signals and generates M M-dimensional second signals on the basis of a precoding signal and of the first signals, and finally, a transmitter sums all of the second signals and then transmits by utilizing M subchannels. As such, each subchannel carries information of the M original signals; hence, when any subchannel experiences deep fading, the deep fading is shared jointly by M signals, thus preventing the deep fading from causing a particularly severe impact on any signal. Moreover, all of the original signals can be recovered by utilizing the signals on the other subchannels, thus increasing the systematic resistance against subchannel deep fading. Meanwhile, the system implements the parallel transmission of the M original signals, thus ensuring the throughput of a communication system.

Claims

1. A high-dimensional signal transmission method, wherein in the method, a transmitter for processing and sending an original signal, a receiver for receiving a signal and recovering the original signal, and a plurality of subchannels for the transmitter and the receiver are provided; the plurality of subchannels comprise: time domain, frequency domain, space domain and code domain subchannels; and the high-dimensional signal transmission method comprises the following steps: step 1: generating, by the transmitter, M M-dimensional precoding signals .sub.1(t), .sub.2(t), . . . , .sub.M(t), and generating, by the receiver, M M-dimensional matched signals .sub.1(t), .sub.2(t), . . . , .sub.M(t), wherein M is equal to a number of the subchannels, the precoding signals and the matched signals satisfy: .sub.i.sup.H(t)diag $\left({}_i\left(t\right)\right)=\left[\underset{M}{\underset{}{\begin{array}{cccc}1& 1& .Math.& 1\end{array}}}\right],$ diag(.sub.i(t)) represents a diagonal matrix composed of .sub.i(t) elements, .sub.i.sup.H(t) represents a conjugate transposition of .sub.i.sup.H(t), and i=1, 2, 3, . . . , M; step 2: generating, by the transmitter, M M-dimensional first signals s.sub.1(t), s.sub.2(t), . . . , s.sub.M(t) according to M original signals q.sub.1(t), q.sub.2(t), . . . , q.sub.M(t), wherein the original signals represent to-be-sent data signals, and the generated first signals satisfy:
.sub.i.sup.H(t)diag(.sub.i(t))s.sub.i(t)=q.sub.i(t) step 3: generating, by the transmitter, M M-dimensional second signals x.sub.1(t), x.sub.2(t), . . . , x.sub.M(t) according to the precoding signals and the first signals, wherein a generation method is as follows:
x.sub.j(t)=diag(.sub.j(t))s.sub.j(t),j=1,2, . . . ,M summing up, by the transmitter, all of the second signals to obtain an M-dimensional transmission signal $y\left(t\right)=\underset{j=1}{\overset{M}{.Math.}}{x}_j\left(t\right),$ and sending the transmission signal to the receiver by M subchannels, wherein one subchannel is used to send one dimension of the transmission signal; and step 4: sending, by the transmitter, the transmission signal y(t) to the receiver, estimating, by the receiver, the transmission signal y(t) to obtain a received signal r(t), and generating by the receiver, an estimation of the M original signals according to the matched signals and the received signal, wherein the generation method is as follows:
.sub.i(t)=.sub.i.sup.H(t)r(t),i=1,2, . . . ,M .sub.i(t) represents an estimation of an i.sup.th original signal.

2. The high-dimensional signal transmission method according to claim 1, wherein the precoding signals and the matched signals are time-varying signals.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a block diagram of signal processing of a transmitter according to the present invention;

[0016] FIG. 2 is a block diagram of signal processing of a receiver according to the present invention; and

[0017] FIG. 3 is a schematic diagram of the worst-case error rate performance of a method disclosed by the present invention when different numbers of subchannels experience deep fading.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] A specific embodiment of the present invention is given below with reference to block diagrams of the specification. In this embodiment, a transmitter adopts a transmitter signal processing block diagram shown in FIG. 1, the transmitter maps a bit stream into constellation signals first, and a group of original signals q.sub.1(t), q.sub.2(t), . . . , q.sub.M(t) are formed by M constellation signals. In this embodiment, M=64, and the original signals are QPSK signals.

[0019] The transmitter generates M M-dimensional precoding signals .sub.1(t), .sub.2(t), . . . , .sub.M(t), and the receiver generates M M-dimensional matched signals .sub.1(t), .sub.2(t), . . . , .sub.M(t). In this embodiment,

[00003]${}_1\left(t\right)=\mathrm{vec}\left(\left[\begin{array}{cccc}{e}^{j2f_{1}t}{e}^{j2f_{2}t}& e^{j4f_{1}t}{e}^{j2f_{2}t}& .Math.& e^{j16f_{1}t}{e}^{j2f_{2}t}\\ e^{j2f_{1}t}{e}^{j4f_{2}t}& e^{j4f_{1}t}{e}^{j4f_{2}t}& .Math.& e^{j16f_{1}t}{e}^{j4f_{2}t}\\ .Math.& .Math.& .Math.& .Math.\\ e^{j2f_{1}t}{e}^{j16f_{2}t}& e^{j4f_{1}t}{e}^{j16f_{2}t}& .Math.& e^{j16f_{1}t}{e}^{j16f_{2}t}\end{array}\right]\right)$

[0020] where f.sub.1=100 kHz, f.sub.2=800 kHz, and a function vec(A) indicates that columns of a matrix A are extracted and put together in order to forma new column vector.

.sub.i(t)=.sub.1(t+(i1)),i=2,3, . . . ,M

.sub.i(t)=.sub.i*(t),i=2,3, . . . ,M

[0021] where

[00004]$=\frac{1}{64{10}^5},$

and .sub.i*(t) represents a vector that is obtained by conjugating each elements in the vector .sub.i(t).

[0022] The transmitter generates M M-dimensional first signals s.sub.1(t), s.sub.2(t), . . . , s.sub.M(t) according to M original signals q.sub.1(t), q.sub.2(t), . . . , q.sub.M(t), where the first signals satisfy:

.sub.i.sup.H(t)diag(.sub.i(t))s.sub.i(t)=q.sub.i(t)

[0023] The transmitter generates M M-dimensional second signals x.sub.1(t), x.sub.2(t), . . . , x.sub.M(t), where the generation method is as follows:

[0024] x.sub.j(t)=diag(.sub.j(t))s.sub.j(t), j=1, 2, . . . , M. The transmitter sums up all of the second signals to obtain an M-dimensional transmission signal

[00005]$y\left(t\right)=\underset{j=1}{\overset{M}{.Math.}}{x}_j\left(t\right),$

and sends the transmission signal to the receiver by M subchannels, where one subchannel is used to send one dimension of the transmission signal.

[0025] The receiver adopts a receiver signal processing block diagram shown in FIG. 2. The receiver estimates the transmission signal y(t) to obtain a received signal r(t). The receiver generates an estimation of M original signals according to the matched signals and the received signal, where the generation method is as follows:

.sub.i(t)=.sub.i.sup.H(t)r(t),i=1,2, . . . ,M

[0026] FIG. 3 simulates the worst-case error rate performance of a method provided by this embodiment when different numbers of subchannels experience deep fading, where the worst-case error rate performance refers to the error performance of a path with the worst performance in M signals. It can be seen that when 10 subchannels experience 5 dB deep fading, the worst-case performance loss is limited to be within 1.5 dB by the method provided by this embodiment, which has a gain exceeding 3.5 dB compared with the traditional method. Therefore, the method provided by this embodiment can improve the tolerance of the system on the deep fading of the subchannels while ensuring the throughput of the system.