Minimum mean square error beam forming-based information transmission method in two-way channel

A minimum mean square error, beamforming technology, applied in baseband system components, error prevention/detection through diversity reception, space transmit diversity, etc., can solve problems such as poor bit error rate performance, high complexity, and errors

Inactive Publication Date: 2010-06-16
XIDIAN UNIV
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Problems solved by technology

[0005] The beamforming method in the wireless communication network designs the beamforming matrix according to the state of the fading channel, and uses the beamforming matrix to preprocess the transmitted signal to eliminate inter-channel interference, improve the transmission performance in the multipath fading channel, and the capacity of the two-way relay channel is optimal The beamforming method is different from the design in the traditional

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  • Minimum mean square error beam forming-based information transmission method in two-way channel
  • Minimum mean square error beam forming-based information transmission method in two-way channel
  • Minimum mean square error beam forming-based information transmission method in two-way channel

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Embodiment Construction

[0030] refer to figure 2 , an information transmission method based on minimum mean square error beamforming in a two-way channel, comprising the following steps:

[0031] Step 1, two source nodes send information at the same time

[0032] refer to figure 1 , use Turbo code to compare the data information d of two source nodes 1 , d 2 Encode separately to obtain the encoding sequence x 1 , x 2 , modulate the encoded sequence, and the modulated signal s 1 (n) and s 2 (n) with power p 1 and p 2 At the same time, it is sent to the relay node.

[0033] Step 2, the relay node constructs the beamforming matrix

[0034] The relay node constructs the beamforming matrix according to the minimum mean square error criterion:

[0035] (2.1) Let the uplink channel H UL =[h 1 , h 2 ], downlink channel H DL =[h 2 , h 1 ] T , h 1 and h 2 are the channels from the source node to the relay node, and for the uplink channel H UL Perform singular value decomposition H UL =U∑...

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Abstract

The invention discloses a minimum mean square error beam forming-based information transmission method in a two-way channel, belongs to the technical field of wireless communication, and mainly solves the problem of high technical complexity of the prior art. Particularly, the invention provides the information transmission method capable of improving channel capacity and error ratio performance, and reducing complexity at the same time by aiming at a wireless communication network of two source nodes and a relay node. The method comprises the following steps that: the two source nodes simultaneously send encoding information to the relay node; the relay node builds a beam forming matrix according to a minimum mean square error rule; the relay node carries out beam forming processing on the received source node mixed information, and then broadcasts the source node mixed information after the beam forming processing to the source nodes; and the source nodes are decoded to acquire information of other parts. The method reduces the complexity and ensures the correctness of transmission without great influence on system performance, and can be used for reliable information transmission in a two-way relay system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to network coding and beam forming, in particular to a wireless communication network of two source nodes and a relay node, which can be used to improve channel capacity and bit error rate performance. Background technique [0002] Using relays to help mobile users forward data can obtain additional diversity gain and improve the bit error BER performance of the receiving end. It is one of the effective means to improve the call quality of mobile users at the edge of the cell. against figure 1 In the shown wireless two-way relay channel, when two source nodes exchange information through a relay node, four time slots are usually required, that is, two source nodes occupy one time slot to communicate with the relay node, and the relay node occupies Two time slots, forwarding data for two source nodes respectively. [0003] As a design scheme in modern communication net...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L1/06H04L25/02
Inventor 李颖李海强孙岳
Owner XIDIAN UNIV
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