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Space-time code transmission and decoding method in y channel

A space-time code and decoding technology, which is applied in the field of space-time code transmission and decoding, can solve the problems of reducing computational complexity and high computational complexity

Inactive Publication Date: 2018-01-23
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0005] Aiming at the problem of high computational complexity of the existing scheme, the present invention proposes a space-time code transmission and decoding method in the Y channel, which is suitable for the Y channel of three users and one relay node, and the user and the relay node Nodes are equipped with two antennas, this method can reduce the computational complexity

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Embodiment Construction

[0055] An embodiment of the present invention is given below to further describe the present invention in detail.

[0056] System model such as figure 1 As shown, there are 3 users and 1 relay node, all of which are configured with two antennas. With the help of the relay, user i expects the codeword S ji Send to user j and receive codeword S from user j at the same time ij , i=1,2,3, j=1,2,3, i≠j. Assuming that there is no wireless link between users, all codeword transmission must go through the relay node. S ji and S ij The expression form is as follows

[0057]

[0058] Among them, s k ji and s k ij is the modulation symbol, k=1,2. S ji and S ij All have the structure of the Alamouti codeword.

[0059] The transmission of the signal is divided into two phases, the MA phase and the BC phase. In the MA phase, the signal transmission is divided into two steps. Step 1, three users send V 21 S 21 +V 31 S 31 , V 12 S 12 +V 32 S 32 and V 13 S 13 +V 2...

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Abstract

The invention discloses a space time code transmission method and a decoding method in a Y information channel and is suitable for three users and the Y information channel where the user and a relay node are all configured with two antennas. In multiple-access stage, each user performs Alamouti coding and pre-coding to a modulating signal thereof, and transmits pre-coded codons twice according to certain rules while the relay node performs linear operation to a receiving signal so as to reduce the number of codons which are mutually interfered with each other and decodes by using an orthogonal property of an equivalent channel matrix corresponding to the Alamouti codons; in broadcast stage, the relay node transmits signals obtained by decoding in the multiple-access stage after performing the Alamouti coding at twice, and the three users use the orthogonal property of the equivalent channel matrix corresponding to the Alamouti codons to decode the signals transmitted by the relay node, thereby obtaining signals which expects to receive by the users themselves.

Description

technical field [0001] The invention relates to the communication field, in particular to a space-time code transmission and decoding method in a Y channel. Background technique [0002] Relay technology can expand cell coverage and improve spectrum utilization, which is one of the current research hotspots in wireless communication. Scholars have made various extensions to the relay channel model, and proposed models such as multi-user two-way relay channel and multi-user multi-direction relay channel, and Y channel is one of them. [0003] The Y channel model contains multiple users and 1 relay node. There is no direct link between users, and each user sends information to other users through relay nodes. There are three transmission modes of the Y channel, namely TDMA mode, MU-MIMO mode and two-slot transmission mode. For the Y channel model of three users, the TDMA mode requires 6 time slots to complete an information exchange, and the MU-MIMO mode requires 4 time slo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/0456H04L25/03
CPCH04B7/0456H04L1/0618H04L25/03006
Inventor 田心记李亚王瑞孙江峰司马海峰杨冬
Owner HENAN POLYTECHNIC UNIV
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