CN102281127A - Signal transmission method, system thereof, transmitter and receiver - Google Patents

Abstract

The invention discloses a signal transmission method which comprises the following steps: according to receiver feedback information, a transmitter determines a present mobile speed mode of a receiver; when the mobile speed mode is a low speed mobile mode, a coding mode of a coherent emission mode is employed to code a sending signal, and when the mobile mode is a high speed mobile mode, a coding mode of a noncoherent emission mode is employed to code the sending signal; a signal after coding is sent to the receiver. In addition, the invention also discloses a signal transmission system, the transmitter and the receiver. According to a technical scheme disclosed in the invention, wireless transmission has good system performance under different mobile environments.

Description

A kind of method for transmitting signals, system and transmitter and receiver

Technical field

The present invention relates to wireless communication technology, relate in particular to a kind of method for transmitting signals, system and transmitter and receiver.

Background technology

Along with development of wireless communication devices, people have higher requirement to the validity and the reliability of wireless transmission.Multi-antenna technology is greatly improved the availability of frequency spectrum and link reliability because the multipath that can make full use of in the radio transmission transmits, and has therefore obtained extensive use.

Consider to be subjected to the influence of wireless channel fading effect when signal transmits that in wireless channel therefore, in multi-antenna technology was used, the coding emission of adopting the coherent transfer detection technique to carry out signal was resolved with reception more.The coherent transfer detection technique combines the diversity gain of many antennas and the coding gain of chnnel coding, can effectively resist the fading effect of wireless channel under the prerequisite that does not reduce data transmission rate, realizes the reliable transmission of data.But coherent detection need obtain precise channels to be estimated, when there are bigger relative velocity in transmitting terminal and receiving terminal, under high-speed mobile environment, because coherence time is less, when the pilot sequence density that is used for channel estimating is not enough, precision of channel estimation can reduce greatly, and then causes performance loss bigger.Yet if use a large amount of pilot frequency sequences, can reduce system spectral efficiency again, and under the low speed mobile environment, using a large amount of pilot frequency sequences also is a kind of waste, makes the cost of channel estimating become very big.So the system that under the high-speed mobile environment employing coherent transfer is detected is a kind of challenge.

For this reason, in multi-antenna technology is used, also there is a kind of incoherent transmission detection technique.Incoherent detection does not need channel estimating, therefore is not subjected to the influence of high-speed mobile environment, and owing to do not need channel information, making incoherent transmission detect does not need extra pilot-frequency expense.But incoherent transmission detection detects to compare with coherent transfer and exists performance loss, and the decoding complex degree of incoherent detection is very high, and usually with transmitting antenna and constellation sizes exponential increase, this has limited the application that incoherent transmission detects again.

For this reason, how to make having all under different mobile environment preferably that systematic function is the problem that present wireless transmission need solve.

Summary of the invention

In view of this, provide a kind of method for transmitting signals on the one hand among the present invention, provide a kind of signal transmission system and transmitter and machine to receive machine on the other hand, so that wireless transmission all has systematic function preferably under different mobile environment.

Method for transmitting signals provided by the present invention comprises:

Transmitter is determined receiver current movement speed pattern;

When described translational speed pattern is the low speed Move Mode, adopt the coded system of coherent transmission mode that signal to be sent is encoded, when described translational speed pattern is the high-speed mobile pattern, adopt the coded system of noncoherent transmission modes that signal to be sent is encoded;

Signal behind the coding is sent to receiver.

Signal transmission system provided by the present invention comprises: transmitter and receiver;

Described transmitter is used for determining receiver current movement speed pattern, when described translational speed pattern is the low speed Move Mode, adopt the coded system of coherent transmission mode that signal to be sent is encoded, when described translational speed pattern is the high-speed mobile pattern, adopt the coded system of noncoherent transmission modes that signal to be sent is encoded, the signal behind the coding is sent to described receiver;

Described receiver is used to receive the signal from described transmitter, and the signal utilization and the corresponding decoding process of coded system that are received are decoded.

Transmitter provided by the present invention comprises:

The velocity mode determination module is used for determining that receiver current movement speed pattern is low speed Move Mode or high-speed mobile pattern;

First coding module is used for when the translational speed pattern that described velocity mode determination module is determined is the low speed Move Mode, adopts the coded system of coherent transmission mode that signal to be sent is encoded;

Second coding module is used for when the translational speed pattern that described velocity mode determination module is determined is the high-speed mobile pattern, adopts the coded system of noncoherent transmission modes that signal to be sent is encoded;

Signal transmitting module is used for the signal behind described first coding module or second coding module coding is sent to receiver.

Receiver provided by the present invention comprises:

Signal receiving module, be used to receive signal from transmitter, when the coded system of determining described signal is the coded system of coherent transmission mode, described signal is transferred to first decoder module, when the coded system of determining described signal is the coded system of noncoherent transmission modes, described signal is transferred to second decoder module;

First decoder module is used for the signal to described signal receiving module transmission, adopts the decoding process of coherent detection pattern to decode;

Second decoder module is used for the signal to described signal receiving module transmission, adopts the decoding process of incoherent detection pattern to decode.

From such scheme as can be seen, translational speed that can be different according to receiver in the embodiment of the invention adopts different coded systems that data to be sent are encoded, thereby has realized adaptive signal transmission.And in this self-adapting signal transmission plan, by under the low speed mobile environment, employing has the coherent transfer detection technique of better performance, and under high-speed mobile environment, employing need not the incoherent transmission detection technique of channel estimating, makes that the technical scheme in the embodiment of the invention can both obtain preferable performance under different mobile environment.

In addition, by two kinds of difference empty time-codes after the simplification are provided, make under high-speed mobile environment when adopting incoherent transmission detection technique in the embodiment of the invention, can reduce complexity of decoding.

Description of drawings

Fig. 1 is the exemplary process diagram of method for transmitting signals in the embodiment of the invention;

Fig. 2 is the schematic diagram of code method during first kind of difference empty in the embodiment of the invention;

The schematic diagram of code method when Fig. 3 is first kind of difference empty of embodiment of the invention illustrated;

Fig. 4 is the schematic diagram of code method during second kind of difference empty in the embodiment of the invention;

The schematic diagram of code method when Fig. 5 is second kind of difference empty of embodiment of the invention illustrated;

Fig. 6 is the exemplary block diagram of signal transmission system in the embodiment of the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.

Fig. 1 is the exemplary process diagram of method for transmitting signals in the embodiment of the invention.As shown in Figure 1, this flow process comprises the steps:

Step 101, transmitter are determined receiver current movement speed pattern, when described translational speed pattern is the low speed Move Mode, and execution in step 102; When described Move Mode is the high-speed mobile pattern, execution in step 103.

In this step, can with the translational speed mode division of receiver low speed Move Mode and high-speed mobile pattern.When specifically determining the translational speed pattern of receiver, can be undertaken determining alternately that this moment, transmitter can be determined receiver current movement speed pattern according to the feedback information of receiver by Receiver And Transmitter.Perhaps also can assist transmitter to determine by third party's module.Wherein, when being undertaken determining alternately, can have following two kinds of definite modes at least by Receiver And Transmitter.

Mode one:

Receiver detects the current translational speed of self, current translational speed that detects and the threshold speed of presetting are compared, if described current translational speed is higher than described threshold speed, determine that then self current movement speed pattern is the high-speed mobile pattern, otherwise determine that self current movement speed pattern is the low speed Move Mode, indicates determined current translational speed pattern to transmitter; Transmitter is determined receiver current movement speed pattern according to the indication of described receiver.

Wherein, when receiver is indicated determined current translational speed pattern to transmitter,, can adopt the information of 1 bit that determined current translational speed pattern is indicated to transmitter for conserve system resources.As, utilize 1 expression low speed Move Mode, 0 expression high-speed mobile pattern.

Mode two:

Receiver detects the current translational speed of self, and the current translational speed that is detected is indicated to transmitter; Transmitter compares receiver current translational speed that detects and the threshold speed of presetting, if described current translational speed is higher than described threshold speed, determine that then receiver current movement speed pattern is the high-speed mobile pattern, otherwise determine that receiver current movement speed pattern is the low speed Move Mode.

In the above-mentioned dual mode, receiver can periodically detect the current translational speed of self according to predetermined period, perhaps also can detect the current translational speed of self when satisfying the trigger condition of setting.

Step 102 adopts the coded system of coherent transmission mode that signal to be sent is encoded.

In this step, the coded system of coherent transmission mode can be for the coded system of any coherent transmission mode of the prior art, and as Space Time Coding, code encoding method is placed when promptly the information bit of input being modulated the back according to sky, finishes Space Time Coding.

In addition, the coded system of coherent transmission mode also can be the coded system of newly-increased various coherent transmission mode.

Step 103 adopts the coded system of noncoherent transmission modes that signal to be sent is encoded.

In this step, the coded system of noncoherent transmission modes can be the coded system of any incoherent sending mode of the prior art, as various difference empty time-codes of the prior art etc.

In addition, the coded system of noncoherent transmission modes also can be the coded system of newly-increased various noncoherent transmission modes.

Step 104 sends to receiver with the signal behind the coding.

Receiver is decoded to signal utilization behind the described coding and the corresponding decoding process of coded system after receiving from the signal behind the transmitter coding.

During specific implementation, if the coded system of the coded system of coherent transmission mode and noncoherent transmission modes has only a kind of coded system selective respectively, then receiver can be determined the received signal corresponding coding manner according to self determined current translational speed pattern.Perhaps, transmitter also can be indicated the translational speed pattern or the coded system of signal encoding correspondence to receiver, and receiver is determined the received signal corresponding coding manner according to the described indication of transmitter.For example, transmitter can provide an indication information in downstream signal, with the coded system of explanation present encoding employing.

Coded system selective and/or noncoherent transmission modes has more than a kind of coded system selective if the coded system of coherent transmission mode has more than a kind of coded system, then can the signal encoding corresponding coding manner be indicated to receiver by transmitter, receiver is determined the received signal corresponding coding manner according to the described indication of transmitter.For example, transmitter can provide an indication information in downstream signal, with the coded system of explanation present encoding employing.

In the embodiment of the invention, in order to reduce the decoding complex degree of incoherent detection, consider that the empty time-code code check of Alamouti is than higher, simultaneously bigger diversity gain and lower decoding complex degree are arranged again, code method when providing the difference empty of two kinds of simplification based on the empty time-code of Alamouti again in the above-mentioned steps 103.

Fig. 2 is the schematic diagram of code method during first kind of difference empty in the embodiment of the invention.As shown in Figure 2, the cataloged procedure of first kind of difference empty time-code comprises:

Input two-way information bit is modulated described two-way information bit, promptly described two-way information bit is carried out the Alamouti differential space-time coding, obtains code signal s ₁And s ₂

To described code signal s ₁And s ₂The precoding processing that comprises empty block code (SFBC) frequently and matrix mapping is promptly to described code signal s ₁And s ₂Carry out the Alamouti Space Time Coding, obtain sky time-code matrix

Utilize encoder matrix W _{M * 2}, with described empty time-code matrix

Expand to the M transmit antennas, obtain the matrix that transmits

Wherein, subscript * represents complex conjugate, and W is any two row of M * M unitary matrix, and M is the arbitrary integer more than or equal to 2.

Situation with two-phase PSK (BPSK) modulation and four transmit antennas is an example below, and said process is illustrated.As shown in Figure 3, cataloged procedure comprises:

Input information bits a ₁And a ₂Carry out the Alamouti differential space-time coding, obtain code signal s ₁And s ₂Then to code signal s ₁And s ₂Carry out the Alamouti Space Time Coding, obtain

Afterwards, use encoder matrix W _{4 * 2}The empty time-code of Alamouti is expanded to 4 transmit antennas, obtain the matrix that transmits

$\left(\begin{array}{cc}{d}_{11}& d_{12}\\ d_{21}& d_{22}\\ d_{31}& d_{32}\\ d_{41}& d_{42}\end{array}\right).$

As seen above-mentioned, when adopting the BPSK modulation, import two information bits at every turn, when adopting quarternary phase-shift keying (QPSK) (QPSK) modulation, then import four information bits, two information bits in promptly every road at every turn.

Fig. 4 is the schematic diagram of code method during second kind of difference empty in the embodiment of the invention.As shown in Figure 4, the cataloged procedure of second kind of difference empty time-code comprises:

Corresponding N transmit antennas sets in advance N/2 Alamouti differential space-time coding unit, and wherein, N is the even number more than or equal to 2.

Corresponding each Alamouti differential space-time coding unit is imported the two-way information bit respectively, each road information bit to input is modulated, be that each Alamouti differential space-time coding unit carries out the Alamouti differential space-time coding to the two-way information bit of importing self respectively, obtain code signal s ₁, s ₂..., s _N-1, s _N

To described code signal s ₁, s ₂..., s _N-1, s _NCarry out sky block code SFBC+ frequency switching frequently and send diversity FSTD Space Time Coding, i.e. precoding obtains the matrix that transmits

Wherein, subscript * represents complex conjugate.

Be example still below, said process is illustrated with the situation of BPSK modulation and four transmit antennas.As shown in Figure 5, cataloged procedure comprises:

Corresponding 4 transmit antennas set in advance 2 Alamouti differential space-time coding unit.

Input information bits a ₁And a ₂Carry out the Alamouti differential space-time coding, obtain code signal s ₁And s ₂Input information bits a ₃And a ₄Carry out the Alamouti differential space-time coding, obtain code signal s ₃And s ₄Then to code signal s ₁, s ₂, s ₃And s ₄Carry out the SFBC+FSTD Space Time Coding, obtain the matrix that transmits

$\left(\begin{array}{cccc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}& 0& 0\\ s_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HSA00000150869400012.png,HSA00000150869400022.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& {\mathrm{<figure-callout\; id="3"\; label="s"\; filenames="HSA00000150869400022.png"\; state="\{\{state\}\}">s</figure-callout>}}_3^{*}\end{array}\right).$

As seen above-mentioned, when adopting the BPSK modulation, import four information bits at every turn, when adopting the QPSK modulation, then import eight information bits, two information bits in promptly every road at every turn.

Still be modulated to example with BPSK below, the Alamouti differential space-time coding process during to above-mentioned two kinds of difference empty in the code method is described in detail.

Initialization is provided with

During t=1

Wherein A and B are determined by input information bits, when input bit is a ₁And a ₂The time can calculate corresponding A and B, obtain s ₃And s ₄According to input information bits a ₃And a ₄Obtain new A and B, thus can basis

Calculate s ₅And s ₆Parameter A, B can be calculated by following formula

$A=\mathrm{Map}\left(a_3\right)\frac{1}{\sqrt{2}}+\mathrm{Map}\left(a_4\right)\frac{1}{\sqrt{2}}$

, wherein Map () expression bit is to the mapping of symbol.

An if last moment signal

Current input bit is (1 0), and bit (1 0) is mapped as symbol (1 1), obtains A=0, B=1.So

Correspondingly, receiver adopts corresponding decoding method to carry out the frequency domain differential decoding between the received signal of two continuous frames after receiving from first kind of difference empty time-code of employing of transmitter or second kind of difference empty time-code encoded signals.For high-visible, the situation with BPSK modulation, 4 transmit antennas and 1 reception antenna is an example below, and the homographic solution code method to above-mentioned two kinds of coding methods is described in detail respectively.

The coding/decoding method of first kind of difference empty time-code comprises:

Suppose that channel matrix is H=(h ₁₁h ₁₂h ₁₃h ₁₄), matrix transmits

Then received signal is R=HC+N, and wherein N is a noise matrix.

The moment 1 received signal

The moment 2 received signals $\left(\begin{array}{cc}{r}_3& r_4\end{array}\right)=\mathrm{HW}\begin{array}{c}\left(\begin{array}{cc}{s}_3& -s_4^{*}\\ s_4& {\mathrm{<figure-callout\; id="3"\; label="s"\; filenames="HSA00000150869400022.png"\; state="\{\{state\}\}">s</figure-callout>}}_3^{*}\end{array}\right)+N^{\&prime;\&prime;}\end{array},$

Because code signal s ₃, s ₄With s ₁, s ₂And the emission information bit has relation, received signal r ₁, r ₂, r ₃And r ₄Inherent contact is also arranged.R to received signal ₁, r ₂, r ₃And r ₄Handle, obtain variable R ₁And R ₂

${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HSA00000150869400012.png,HSA00000150869400022.png"\; state="\{\{state\}\}">R</figure-callout>}}_1=\left(\begin{array}{cc}{r}_3& r_4^{*}\end{array}\right)\&CenterDot;{\left(\begin{array}{cc}{r}_1& {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^{*}\end{array}\right)}^{*}=\left(\begin{array}{cc}{s}_3& s_4\end{array}\right)\left(\begin{array}{cc}{h}_{11}^{\&prime;}& -{h_{12}^{\&prime;}}^{*}\\ h_{12}^{\&prime;}& {h_{11}^{\&prime;}}^{*}\end{array}\right){\left(\begin{array}{cc}{h}_{11}^{\&prime;}& -{h_{12}^{\&prime;}}^{*}\\ h_{12}^{\&prime;}& {h_{11}^{\&prime;}}^{*}\end{array}\right)}^{*}{\left(\begin{array}{cc}{s}_1^{*}& {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}\end{array}\right)}^T+N^{\&prime;\&prime;\&prime;}=({\left|h_{11}^{\&prime;}\right|}^2+{\left|h_{12}^{\&prime;}\right|}^2)A+N^{\&prime;\&prime;\&prime;}$

${\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">R</figure-callout>}}_2=\left(\begin{array}{cc}{r}_3& r_4^{*}\end{array}\right)\&CenterDot;{\left(\begin{array}{cc}{r}_2& -{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HSA00000150869400012.png,HSA00000150869400022.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{*}\end{array}\right)}^{*}=\left(\begin{array}{cc}{s}_3& s_4\end{array}\right)\left(\begin{array}{cc}{h}_{11}^{\&prime;}& {{-h}_{12}^{\&prime;}}^{*}\\ h_{12}^{\&prime;}& {h_{11}^{\&prime;}}^{*}\end{array}\right){\left(\begin{array}{cc}{h}_{11}^{\&prime;}& -{h_{12}^{\&prime;}}^{*}\\ h_{12}^{\&prime;}& {h_{11}^{\&prime;}}^{*}\end{array}\right)}^{*}{\left(\begin{array}{cc}-s_2& s_1\end{array}\right)}^T+N^{\&prime;\&prime;\&prime;\&prime;}=({\left|h_{11}^{\&prime;}\right|}^2+{\left|h_{12}^{\&prime;}\right|}^{2}B+N^{\&prime;\&prime;\&prime;\&prime;}$

R ₁And R ₂Can be considered as a convergent-divergent that size is identical, so can obtain to A and B maximal possibility estimation to A and B

$\left(\begin{array}{cc}{R}_1& {\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">R</figure-callout>}}_2\end{array}\right)=({\left|h_{11}^{\&prime;}\right|}^2+{\left|h_{12}^{\&prime;}\right|}^2)\left(\begin{array}{cc}A& B\end{array}\right)+\left(\begin{array}{cc}{N}^{\&prime;\&prime;\&prime;}& N^{\&prime;\&prime;\&prime;\&prime;}\end{array}\right)$

$\left(\begin{array}{cc}A& B\end{array}\right)=\arg \underset{\left(\begin{array}{cc}A& B\end{array}\right)\&Element;V}{\max }\mathrm{Re}\{\left(\begin{array}{cc}A& B\end{array}\right)\&CenterDot;\left(\begin{array}{cc}{R^{*}}_1& {R^{*}}_2\end{array}\right)\}$

N ' and N in the following formula " being noise signal, N " ' with N " " are the relevant signal of noise, and V is the set of vectors that (A B) forms.Calculate (A B) by following formula.

Because vector (A B) has mapping relations one by one with the emission information bit, so can obtain launching information bit by (A B), finishes decoding.

The coding/decoding method of second kind of difference empty time-code comprises:

Suppose that channel matrix is H=(h ₁₁h ₁₂h ₁₃h ₁₄), matrix transmits

Then received signal is R=HC+N, and wherein N is a noise matrix.

Received signal can be written as again

$\left(\begin{array}{cccc}{r}_1& r_2& r_3& r_4\end{array}\right)=\left(\begin{array}{cccc}{h}_{11}& h_{12}& h_{13}& h_{14}\end{array}\right)\left(\begin{array}{cccc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}& 0& 0\\ s_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HSA00000150869400012.png,HSA00000150869400022.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& {\mathrm{<figure-callout\; id="3"\; label="s"\; filenames="HSA00000150869400022.png"\; state="\{\{state\}\}">s</figure-callout>}}_3^{*}\end{array}\right)+\left(\begin{array}{c}{n}_1\\ n_2\\ n_3\\ n_4\end{array}\right)$

$\left(\begin{array}{cccc}{r}_5& r_6& r_7& r_8\end{array}\right)=\left(\begin{array}{cccc}{h}_{11}& h_{12}& h_{13}& h_{14}\end{array}\right)\left(\begin{array}{cccc}{s}_5& -s_6^{*}& 0& 0\\ s_6& s_5^{*}& 0& 0\\ 0& 0& s_7& -s_8^{*}\\ 0& 0& s_8& s_7^{*}\end{array}\right)+\left(\begin{array}{c}{n}_5\\ n_6\\ n_7\\ n_8\end{array}\right)$

Received signal r ₁, r ₂With s emission signal s ₁, s ₂Relation is arranged, r ₅, r ₆With s emission signal s ₅, s ₆Relation is arranged.Because s in cataloged procedure ₅, s ₆With s ₁, s ₂, the emission bit of making a start has relation, the received signal r that it is corresponding ₅, r ₆With r ₁, r ₂Inner link is also arranged.

Calculate following formula

${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HSA00000150869400012.png,HSA00000150869400022.png"\; state="\{\{state\}\}">R</figure-callout>}}_1=\left(\begin{array}{cc}{r}_5& r_6^{*}\end{array}\right)\&CenterDot;{\left(\begin{array}{cc}{r}_1& {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^{*}\end{array}\right)}^{*}=\left(\begin{array}{cc}{s}_5& s_6\end{array}\right)\left(\begin{array}{cc}{h}_{11}& -h_{12}^{*}\\ h_{12}& h_{11}^{*}\end{array}\right){\left(\begin{array}{cc}{h}_{11}& -h_{12}^{*}\\ h_{12}& h_{11}^{*}\end{array}\right)}^{*}{\left(\begin{array}{cc}{s}_1^{*}& {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}\end{array}\right)}^T+N^{\&prime;\&prime;\&prime;}$

$=({\left|h_{11}\right|}^2+{\left|h_{12}\right|}^2)A+N^{\&prime;\&prime;\&prime;}$

${\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HSA00000150869400012.png,HSA00000150869400013.png"\; state="\{\{state\}\}">R</figure-callout>}}_2=\left(\begin{array}{cc}{r}_5& r_6^{*}\end{array}\right)\&CenterDot;{\left(\begin{array}{cc}{r}_2& {-\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HSA00000150869400012.png,HSA00000150869400022.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{*}\end{array}\right)}^{*}=\left(\begin{array}{cc}{s}_5& s_6\end{array}\right)\left(\begin{array}{cc}{h}_{11}& -h_{12}^{*}\\ h_{12}& h_{11}^{*}\end{array}\right){\left(\begin{array}{cc}{h}_{11}& -h_{12}^{*}\\ h_{12}& h_{11}^{*}\end{array}\right)}^{*}{\left(\begin{array}{cc}-s_2& s_1\end{array}\right)}^T+N^{\&prime;\&prime;\&prime;\&prime;}$

$=({\left|h_{11}\right|}^2+{\left|h_{12}\right|}^2)B+N^{\&prime;\&prime;\&prime;\&prime;}$

Wherein N " ' with N " " is the relevant signal of noise.By following formula R as can be known ₁And R ₂Be respectively A and B channel mould value and convergent-divergent, and the convergent-divergent multiple is identical.So can carry out maximal possibility estimation to A and B by following formula

$\left(\begin{array}{cc}A& B\end{array}\right)=\arg \underset{\left(\begin{array}{cc}A& B\end{array}\right)\&Element;V}{\max }\mathrm{Re}\{\left(\begin{array}{cc}A& B\end{array}\right)\&CenterDot;\left(\begin{array}{cc}{R^{*}}_1& {R^{*}}_2\end{array}\right)\}$

V is the set of vectors that (A B) forms in the following formula.After obtaining (A B).Because vector (A B) has mapping relations one by one with the emission information bit, thus can obtain launching information bit by (A B), thus finish decoding.

During specific implementation, also can at first determine selectivity of channel frequency in the embodiment of the invention, when selectivity of channel frequency is strong, code method during preferred first kind of difference empty; In the time of a little less than selectivity of channel frequency, code method in the time of can adopting first kind of difference empty, code method in the time of also can adopting second kind of difference empty.At this moment, transmitter can be indicated current selected coded system to receiver.

Above the method for transmitting signals in the embodiment of the invention is described in detail, again the signal transmission system in the embodiment of the invention is described in detail below.

Fig. 6 is the exemplary block diagram of signal transmission system in the embodiment of the invention.As shown in Figure 6, this system comprises: transmitter and receiver.

Wherein, transmitter is used for determining receiver current movement speed pattern, when described translational speed pattern is the low speed Move Mode, adopt the coded system of coherent transmission mode that signal to be sent is encoded, when described Move Mode is the high-speed mobile pattern, adopt the coded system of noncoherent transmission modes that signal to be sent is encoded, the signal behind the coding is sent to receiver.

Receiver is used to receive the signal from described transmitter, and the signal utilization and the corresponding decoding process of coded system that are received are decoded.

Wherein, if the coded system of the coded system of coherent transmission mode and noncoherent transmission modes has only a kind of coded system selective respectively, then receiver can be determined the received signal corresponding coding manner according to self determined current translational speed pattern, afterwards described received signal utilization and the corresponding decoding process of coded system is decoded.Perhaps, transmitter can further be indicated signal corresponding coding manner behind the described coding or translational speed pattern to receiver, by translational speed pattern or the coded system of receiver according to the coding correspondence of transmitter indication, determine the received signal corresponding coding manner, afterwards described received signal utilization and the corresponding decoding process of coded system are decoded.

Coded system selective and/or noncoherent transmission modes has more than a kind of coded system selective if the coded system of coherent transmission mode has more than a kind of coded system, then can the signal encoding corresponding coding manner be indicated to receiver by transmitter, receiver is determined the received signal corresponding coding manner according to the described indication of transmitter, afterwards described received signal utilization and the corresponding decoding process of coded system is decoded.

During specific implementation, transmitter can be determined receiver current movement speed pattern according to the feedback information of receiver.

For example, receiver can further detect the current translational speed of self, current translational speed that detects and the threshold speed of presetting are compared, if determined current translational speed is higher than described threshold speed, determine that then self current movement speed pattern is the high-speed mobile pattern, otherwise determine that self current movement speed pattern is the low speed Move Mode, indicates determined current translational speed pattern to transmitter.Correspondingly, transmitter is determined receiver current movement speed pattern according to the indication of receiver.Wherein, receiver can utilize the information of 1 bit that determined current translational speed pattern is indicated to transmitter.

Perhaps, receiver is indicated the current translational speed that is detected to transmitter after the current translational speed that detects self.Correspondingly, by transmitter the current translational speed of the receiver that received and default threshold speed are compared, if described current translational speed is higher than described threshold speed, determine that then receiver current movement speed pattern is the high-speed mobile pattern, otherwise determine that receiver current movement speed pattern is the low speed Move Mode.

Corresponding with the method in the present embodiment, when transmitter is encoded to signal to be sent in the coded system that adopts noncoherent transmission modes, code method in the time of can adopting Fig. 2 to difference empty shown in Figure 5 equally.Correspondingly, receiver can carry out the frequency domain differential decoding between the received signal of two continuous frames after definite received signal corresponding coding manner.During specific implementation, transmitter also can at first be determined selectivity of channel frequency, when selectivity of channel frequency is strong, and code method during preferred first kind of difference empty; In the time of a little less than selectivity of channel frequency, code method in the time of can adopting first kind of difference empty, code method in the time of also can adopting second kind of difference empty.At this moment, transmitter can be indicated current selected coded system to receiver.

During specific implementation, the transmitter in the embodiment of the invention can specifically comprise as shown in Figure 6: velocity mode determination module, first coding module, second coding module and signal transmitting module.

Wherein, the velocity mode determination module is used for determining that receiver current movement speed pattern is low speed Move Mode or high-speed mobile pattern.During specific implementation, the velocity mode determination module can be determined receiver current movement speed pattern according to the feedback information of receiver.

First coding module is used for when the translational speed pattern that described velocity mode determination module is determined is the low speed Move Mode, adopts the coded system of coherent transmission mode that signal to be sent is encoded.

Second coding module is used for when the translational speed pattern that described velocity mode determination module is determined is the high-speed mobile pattern, adopts the coded system of noncoherent transmission modes that signal to be sent is encoded.

Signal transmitting module is used for the signal behind described first coding module or second coding module coding is sent to receiver.

Wherein, the velocity mode determination module can directly be determined the present speed pattern of receiver according to the current translational speed pattern of receiver indication, also can be according to the current translational speed of receiver indication, by comparing to determine the current translational speed pattern of receiver with default threshold speed.

Further, if the coded system of the coded system of coherent transmission mode and noncoherent transmission modes has only a kind of coded system selective respectively, then signal transmitting module can be indicated signal corresponding coding manner behind the described coding or translational speed pattern to receiver.

Coded system selective and/or noncoherent transmission modes has more than a kind of coded system selective if the coded system of coherent transmission mode has more than a kind of coded system, and then signal transmitting module can be indicated the signal encoding corresponding coding manner to receiver.

During specific implementation, described second coding module can be used for realizing that Fig. 2 is to differential space-time coding method shown in Figure 5, correspondingly, when corresponding diagram 2 and differential space-time coding method shown in Figure 3, this second coding module can specifically comprise: first modulation module and first precoding module (not shown among Fig. 6).

Wherein, first modulation module is used for the two-way information bit of current input is carried out the Alamouti differential space-time coding, obtains code signal s ₁And s ₂First precoding module is used for code signal s that described modulation module is obtained ₁And s ₂Carry out the Alamouti Space Time Coding, obtain sky time-code matrix

Utilize encoder matrix W _{M * 2}, with described empty time-code matrix Expand to the M transmit antennas, obtain the matrix that transmits

Wherein, W is any two row of M * M unitary matrix, and M is the arbitrary integer more than or equal to 2, and subscript * represents complex conjugate.

When corresponding diagram 4 and differential space-time coding method shown in Figure 5, this second coding module can specifically comprise: second modulation module and second precoding module (not shown among Fig. 6).

Wherein, second modulation module comprises N/2 the Alamouti differential space-time coding unit that corresponding N transmit antennas sets in advance, each Alamouti differential space-time coding unit carries out the Alamouti differential space-time coding to the two-way information bit of importing self respectively, obtains code signal s ₁, s ₂..., s _N-1, s _NWherein, N is the even number more than or equal to 2.Second precoding module is used for described code signal s ₁, s ₂..., s _N-1, s _NCarry out sky block code SFBC+ frequency switching frequently and send diversity FSTD Space Time Coding, obtain the matrix that transmits

Wherein, subscript * represents complex conjugate.

Perhaps, this second coding module also can comprise above-mentioned first modulation module, the first precoding mould, second modulation module, second precoding module simultaneously, and a selectivity of channel frequency determination module.

Wherein, the selectivity of channel frequency determination module is used for determining selectivity of channel frequency, when selectivity of channel frequency is strong, notifies first modulation module and first precoding module to treat code signal and encode; In the time of a little less than selectivity of channel frequency, notify first modulation module and first precoding module or second modulation module and second precoding module to treat code signal and encode.At this moment, signal transmitting module can be indicated current selected coded system to receiver.

During specific implementation, the receiver in the embodiment of the invention can specifically comprise as shown in Figure 6: signal receiving module, first decoder module and second decoder module.

Wherein, signal receiving module is used to receive the signal from transmitter, when the coded system of determining described signal is the coded system of coherent transmission mode, described signal is transferred to first decoder module decodes, when the coded system of determining described signal is the coded system of noncoherent transmission modes, described signal is transferred to second decoder module decodes.

First decoder module is used for the signal to described signal receiving module transmission, adopts the decoding process of coherent detection pattern to decode.

Second decoder module is used for the signal to described signal receiving module transmission, adopts the decoding process of incoherent detection pattern to decode.

Further, this receiver also can comprise: speed detection module, pattern determination module and information indicating module.

Wherein, the speed detection module is used to detect the current translational speed of described receiver.

The pattern determination module is used for current translational speed that the speed detection module is detected and the threshold speed of presetting and compares, if described current translational speed is higher than described threshold speed, determine that then self current movement speed pattern is the high-speed mobile pattern, otherwise determine that self current movement speed pattern is the low speed Move Mode.

The information indicating module is used for the current translational speed pattern that described pattern determination module is determined is indicated to transmitter.

Perhaps, also can not comprise this pattern determination module, then the information indicating module can be used for the current translational speed that the speed detection module detects is indicated to transmitter, is determined the translational speed pattern of receiver by transmitter.

During specific implementation, signal receiving module can be according to the determined current translational speed pattern of pattern determination module, or according to the translational speed pattern or the coded system of the coding correspondence of transmitter indication, determines the signal corresponding coding manner that is received.

In addition, corresponding with the coded system that transmitter is adopted, second decoder module also can further comprise difference empty time-code decoder module, is used for carrying out between the received signal of two continuous frames the frequency domain differential decoding.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.

It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.

Part steps in the embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, as CD or hard disk etc.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, and is within the spirit and principles in the present invention all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (20)

1. a method for transmitting signals is characterized in that, this method comprises:

Transmitter is determined receiver current movement speed pattern;

When described translational speed pattern is the low speed Move Mode, adopt the coded system of coherent transmission mode that signal to be sent is encoded, when described translational speed pattern is the high-speed mobile pattern, adopt the coded system of noncoherent transmission modes that signal to be sent is encoded;

Signal behind the coding is sent to receiver.

2. the method for claim 1, it is characterized in that, this method further comprises: receiver detects the current translational speed of self, current translational speed that detects and the threshold speed of presetting are compared, if described current translational speed is higher than described threshold speed, determine that then self current movement speed pattern is the high-speed mobile pattern, otherwise determine that self current movement speed pattern is the low speed Move Mode, indicates determined current translational speed pattern to transmitter;

Described transmitter determines that receiver current movement speed pattern is: transmitter is determined receiver current movement speed pattern according to the indication of described receiver.

3. method as claimed in claim 2 is characterized in that, described determined current translational speed pattern is indicated to transmitter is: utilize the information of 1 bit that determined current translational speed pattern is indicated to transmitter.

4. the method for claim 1 is characterized in that, this method further comprises: receiver detects the current translational speed of self, and the current translational speed that is detected is indicated to transmitter;

Described transmitter determines that receiver current movement speed pattern is: transmitter compares the current translational speed of the receiver that received and default threshold speed, if described current translational speed is higher than described threshold speed, determine that then receiver current movement speed pattern is the high-speed mobile pattern, otherwise determine that receiver current movement speed pattern is the low speed Move Mode.

5. the method for claim 1, it is characterized in that, this method further comprises: receiver receives the described signal from transmitter, according to self determined current translational speed pattern, or according to the translational speed pattern or the coded system of the coding correspondence of transmitter indication, determine the received signal corresponding coding manner, described received signal utilization and the corresponding decoding process of coded system are decoded.

6. as each described method in the claim 1 to 4, it is characterized in that the coded system of described employing noncoherent transmission modes is encoded to signal to be sent and comprised: adopt the differential space-time coding mode that signal to be sent is encoded.

7. method as claimed in claim 6 is characterized in that, described employing differential space-time coding mode is encoded to signal to be sent and comprised:

Input two-way information bit carries out the Alamouti differential space-time coding to described two-way information bit, obtains code signal s ₁And s ₂

To described code signal s ₁And s ₂Carry out the Alamouti Space Time Coding, obtain sky time-code matrix

Wherein, subscript * represents complex conjugate;

Utilize encoder matrix W _{M * 2}, with described empty time-code matrix

Expand to the M transmit antennas, obtain the matrix that transmits

Wherein, W is any two row of M * M unitary matrix, and M is the arbitrary integer more than or equal to 2.

8. method as claimed in claim 6 is characterized in that, described employing differential space-time coding mode is encoded to signal to be sent and comprised:

Corresponding N transmit antennas sets in advance N/2 Alamouti differential space-time coding unit, and N is the even number more than or equal to 2;

Corresponding each Alamouti differential space-time coding unit is imported the two-way information bit respectively, and each Alamouti differential space-time coding unit carries out the Alamouti differential space-time coding to the two-way information bit of importing self respectively, obtains code signal s ₁, s ₂..., s _N-1, s _N

To described code signal s ₁, s ₂..., s _N-1, s _NCarry out sky block code SFBC+ frequency switching frequently and send diversity FSTD Space Time Coding, obtain the matrix that transmits

Wherein, subscript * represents complex conjugate.

9. method as claimed in claim 6 is characterized in that, described employing differential space-time coding mode is encoded to signal to be sent and comprised:

Determine selectivity of channel frequency, when described selectivity of channel frequency was strong, coding mode was treated and is sent signal and encode when adopting first kind of difference empty; In the time of a little less than described selectivity of channel frequency, when adopting first kind of difference empty when coding mode or second kind of difference empty coding mode treat and send signal and encode;

Coding mode is treated and is sent signal and encode and comprise during first kind of difference empty of described employing:

Input two-way information bit carries out the Alamouti differential space-time coding to described two-way information bit, obtains code signal s ₁And s ₂

To described code signal s ₁And s ₂Carry out the Alamouti Space Time Coding, obtain sky time-code matrix

Wherein, subscript * represents complex conjugate;

Utilize encoder matrix W _{M * 2}, with described empty time-code matrix

Expand to the M transmit antennas, obtain the matrix that transmits

Wherein, W is any two row of M * M unitary matrix, and M is the arbitrary integer more than or equal to 2;

Coding mode is treated and is sent signal and encode and comprise during second kind of difference empty of described employing:

Corresponding N transmit antennas sets in advance N/2 Alamouti differential space-time coding unit, and N is the even number more than or equal to 2;

Corresponding each Alamouti differential space-time coding unit is imported the two-way information bit respectively, and each Alamouti differential space-time coding unit carries out the Alamouti differential space-time coding to the two-way information bit of importing self respectively, obtains code signal s ₁, s ₂..., s _N-1, s _N

To described code signal s ₁, s ₂..., s _N-1, s _NCarry out sky block code SFBC+ frequency switching frequently and send diversity FSTD Space Time Coding, obtain the matrix that transmits

Wherein, subscript * represents complex conjugate.

10. method as claimed in claim 9 is characterized in that, this method further comprises:

The signal corresponding coding manner of transmitter after with described coding indicated to receiver;

Receiver receives the described signal from transmitter, determines described signal corresponding coding manner according to the coded system of transmitter indication, and described signal utilization and the corresponding decoding process of coded system are decoded.

11. a signal transmission system is characterized in that this system comprises: transmitter and receiver;

Described transmitter is used for determining receiver current movement speed pattern, when described translational speed pattern is the low speed Move Mode, adopt the coded system of coherent transmission mode that signal to be sent is encoded, when described translational speed pattern is the high-speed mobile pattern, adopt the coded system of noncoherent transmission modes that signal to be sent is encoded, the signal behind the coding is sent to described receiver;

Described receiver is used to receive the signal from described transmitter, and the signal utilization and the corresponding decoding process of coded system that are received are decoded.

12. system as claimed in claim 11, it is characterized in that, described receiver is further used for detecting the current translational speed of self, current translational speed that detects and the threshold speed of presetting are compared, if described current translational speed is higher than described threshold speed, determine that then self current movement speed pattern is the high-speed mobile pattern, otherwise determine that self current movement speed pattern is the low speed Move Mode, indicates determined current translational speed pattern to described transmitter;

Described transmitter is determined described receiver current movement speed pattern according to the indication of described receiver.

13. a transmitter is characterized in that, this transmitter comprises:

The velocity mode determination module is used for determining that receiver current movement speed pattern is low speed Move Mode or high-speed mobile pattern;

First coding module is used for when the translational speed pattern that described velocity mode determination module is determined is the low speed Move Mode, adopts the coded system of coherent transmission mode that signal to be sent is encoded;

Second coding module is used for when the translational speed pattern that described velocity mode determination module is determined is the high-speed mobile pattern, adopts the coded system of noncoherent transmission modes that signal to be sent is encoded;

Signal transmitting module is used for the signal behind described first coding module or second coding module coding is sent to receiver.

14. transmitter as claimed in claim 13 is characterized in that, described signal transmitting module is further indicated signal corresponding coding manner behind the described coding or translational speed pattern to receiver.

15., it is characterized in that described second coding module comprises as claim 13 or 14 described transmitters:

First modulation module is used for the two-way information bit of current input is carried out the Alamouti differential space-time coding, obtains code signal s ₁And s ₂

First precoding module is used for the code signal s that described first modulation module is obtained ₁And s ₂Carry out the Alamouti Space Time Coding, obtain sky time-code matrix

Utilize encoder matrix W _{M * 2}, with described empty time-code matrix

Expand to the M transmit antennas, obtain the matrix that transmits Wherein, W is any two row of M * M unitary matrix, and M is the arbitrary integer more than or equal to 2, and subscript * represents complex conjugate.

16., it is characterized in that described second coding module comprises as claim 13 or 14 described transmitters:

Second modulation module, comprise N/2 the Alamouti differential space-time coding unit that corresponding N transmit antennas sets in advance, each Alamouti differential space-time coding unit carries out the Alamouti differential space-time coding to the two-way information bit of importing self respectively, obtains code signal s ₁, s ₂..., s _N-1, s _NWherein, N is the even number more than or equal to 2;

Second precoding module is used for described code signal s ₁, s ₂..., s _N-1, s _NCarry out sky block code SFBC+ frequency switching frequently and send diversity FSTD Space Time Coding, obtain the matrix that transmits

Wherein, subscript * represents complex conjugate.

17., it is characterized in that described second coding module comprises as claim 13 or 14 described transmitters: selectivity of channel frequency determination module, first modulation module, first precoding module, second modulation module and second precoding module;

Described selectivity of channel frequency determination module is used for determining selectivity of channel frequency, when selectivity of channel frequency is strong, notifies first modulation module and first precoding module to treat code signal and encode; In the time of a little less than selectivity of channel frequency, notify first modulation module and first precoding module or second modulation module and second precoding module to treat code signal and encode;

First modulation module is used for the two-way information bit of current input is carried out the Alamouti differential space-time coding, obtains code signal s ₁And s ₂

First precoding module is used for the code signal s that described first modulation module is obtained ₁And s ₂Carry out the Alamouti Space Time Coding, obtain sky time-code matrix

Utilize encoder matrix W _{M * 2}, with described empty time-code matrix

Expand to the M transmit antennas, obtain the matrix that transmits Wherein, W is any two row of M * M unitary matrix, and M is the arbitrary integer more than or equal to 2, and subscript * represents complex conjugate;

Second modulation module, comprise N/2 the Alamouti differential space-time coding unit that corresponding N transmit antennas sets in advance, each Alamouti differential space-time coding unit carries out the Alamouti differential space-time coding to the two-way information bit of importing self respectively, obtains code signal s ₁, s ₂..., s _N-1, s _NWherein, N is the even number more than or equal to 2;

Second precoding module is used for described code signal s ₁, s ₂..., s _N-1, s _NCarry out sky block code SFBC+ frequency switching frequently and send diversity FSTD Space Time Coding, obtain the matrix that transmits

Wherein, subscript * represents complex conjugate;

Described signal transmitting module is further used for the signal corresponding coding manner behind the described coding is indicated to receiver.

18. a receiver is characterized in that, this receiver comprises:

Signal receiving module, be used to receive signal from transmitter, when the coded system of determining described signal is the coded system of coherent transmission mode, described signal is transferred to first decoder module, when the coded system of determining described signal is the coded system of noncoherent transmission modes, described signal is transferred to second decoder module;

First decoder module is used for the signal to described signal receiving module transmission, adopts the decoding process of coherent detection pattern to decode;

Second decoder module is used for the signal to described signal receiving module transmission, adopts the decoding process of incoherent detection pattern to decode.

19. receiver as claimed in claim 18 is characterized in that, this receiver further comprises:

The speed detection module is used to detect the current translational speed of described receiver;

The pattern determination module, being used for current translational speed that described speed detection module is detected and the threshold speed of presetting compares, if described current translational speed is higher than described threshold speed, determine that then self current movement speed pattern is the high-speed mobile pattern, otherwise determine that self current movement speed pattern is the low speed Move Mode;

The information indicating module is used for the current translational speed pattern that described pattern determination module is determined is indicated to transmitter.

20., it is characterized in that described second decoder module comprises as claim 18 or 19 described receivers: difference empty time-code decoder module is used for carrying out the frequency domain differential decoding between the received signal of two continuous frames.

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