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Orthogonality difference space-time network coding method of double-direction relay channel model

A two-way relay, channel model technology, applied in the direction of error prevention, error prevention/detection through diversity reception, digital transmission system, etc., can solve the problems of high diversity gain, inability to obtain, etc. Easy to achieve effects

Active Publication Date: 2014-01-15
HANGZHOU BOOGOOB TECH CO LTD
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Problems solved by technology

Based on this, using differential modulation technology, a differential network coding (D-NC) scheme for a two-way relay channel network can be implemented. The conventional D-NC scheme does not need to know the channel information, but only realizes single-antenna transmission. , cannot obtain higher diversity gain

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  • Orthogonality difference space-time network coding method of double-direction relay channel model
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  • Orthogonality difference space-time network coding method of double-direction relay channel model

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Embodiment 1

[0063] An embodiment of a receiver-end MSDSD method based on detection and forwarding network coding in the TWRC model, wherein:

[0064] (1) The system model adopts two sources including and , a TWRC model of a relay node R, the channel can be a Rayleigh fading channel, and the channel model can be Doppler frequency shift fd 1 =0.0075 for slow fading channels and fd 2 =0.03 for fast fading channels. Assuming that the bit source information generated by the two source nodes is independent of each other, each source passes its input bit stream through constellation mapping, Alamouti coding, and differential modulation, (such as DBPSK Modulation mode) to form a coding matrix.

[0065] (2) According to the encoding matrix, the two sources independently broadcast their respective information, and the relay node receives them, and adopts multi-packet processing. Here, the packet length is respectively taken as N = 2, 3, 4, and 5 for instance verification. The relay de...

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Abstract

The invention discloses an orthogonality difference space-time network coding method of a double-direction relay channel model. The model comprises two information sources and a relay R. A multi-antenna mechanism is introduced into the information sources, and a plurality of antennas are arranged. The method comprises the following steps that a signal transmission process is divided into two stages, namely an information source transmission stage and a relay broadcasting stage. In the information source transmission stage, bit flow obtains an emitting signal matrix by constellation labeling, Alamouti coding, difference space-time modulation. In the relay broadcasting stage, signal receiving, detecting and demodulation are achieved, then two information source information xor network coding and differential modulation are achieved, and sending symbols are formed by mapping and are broadcasted to the two information sources. Multi-grouping processing is used during signal receiving, signal detecting is achieved by multiple-symbol difference spherical decoding, and the method is suitable for received signal decoding of an uplink relay and a downlink information source.

Description

technical field [0001] The invention belongs to the field of wireless communication, and mainly relates to an orthogonal differential space-time network coding (ODSTNC) method in a multiple input multiple output two-way relay channel (Multiple input multiple output Two-Way Relay Channel, MIMO-TWRC) model. Background technique [0002] At present, MIMO-TWRC is a two-way multi-hop relay network, which combines the two-way relay communication model and MIMO technology, which can make full use of space resources and further expand the network Coverage, not only can obtain high diversity gain, but also can further improve transmission efficiency. In the TWRC network, the terminal can be two base stations that are far away, and the relay can be a mobile device, such as a mobile phone, so this network can be used to complete the information transfer between two base stations that are far away in the public wireless network. In addition, the MIMO-TWRC model can also be used for in...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06
Inventor 金小萍韩新强朱瑞鑫
Owner HANGZHOU BOOGOOB TECH CO LTD
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