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Transmission method using limiting feedback information in multi-antenna two-hop relay system

A relay system and transmission method technology, applied in the field of precoding transmission method design, to achieve good performance, improve received signal strength, and achieve the effect of low complexity

Inactive Publication Date: 2012-10-03
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the uplink and downlink are not completely symmetrical, so there is inevitably an estimation error in the channel information obtained by the base station through reciprocity

Method used

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  • Transmission method using limiting feedback information in multi-antenna two-hop relay system
  • Transmission method using limiting feedback information in multi-antenna two-hop relay system
  • Transmission method using limiting feedback information in multi-antenna two-hop relay system

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0023] Such as figure 1 Shown: the specific implementation steps of the present invention are as follows:

[0024] 1) The system is based on the transmission power P of the base station and relay station 1 , P 2 And the number of antennas M, N t , and the performance loss threshold defined by b and the number of user antennas N r and other information, according to the following formula to determine the two-level feedback bit number B from the relay station to the base station and from the user to the relay station 1 and B 2 the size of:

[0025] B 1 = Ceil { ( M - 1 ) ( log 2 P 2 - ...

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Abstract

The invention discloses a transmission method using limiting feedback information in a multi-antenna two-hop relay system. The transmission method comprises the following steps: firstly, the system confirms the feedback bit number on two feedback links according to information such as the transmitting power and the antenna numbers of a base station and a relay station, the limited performance loss thresholds, the user antenna numbers and the like, and selects a limited number of multi-antenna users which meet the requirement on the antenna number to wait for receiving the data by adopting a random schedule method; secondly the relay station and each user obtain the channel information from the base station to the relay station and from the relay station to the user through the channel estimation respectively; subsequently the relay station and the user quantize the obtained channel information respectively, and feed back the information to a prior stage through a limited number of bits determined by the system; finally, the base station and the relay station carry out precoding transmission according to the channel information obtained through the feedback respectively. With the adoption of the transmission method, the covering range of a cell of origin is widened effectively; and a system accessible transmission rate which is approximate to ideal channel information condition is obtained.

Description

technical field [0001] The invention relates to a transmission method based on information feedback in a multi-antenna two-hop relay system, and belongs to the field of precoding transmission method design in a multi-antenna relay system. Background technique [0002] In the existing cellular communication system, due to the strong interference of adjacent cell signals, the received signal-to-interference-noise ratio (SINR) of cell edge users is generally relatively low, which seriously affects the communication quality of edge users and restricts the further improvement of system performance. . In order to solve this problem, in recent years, researchers have tried to introduce relay stations into the cell, which can boost the power of the base station signal of the cell and forward it to the edge users of the cell, so as to improve the signal strength received by them, thereby expanding the coverage of the cell and improving the coverage of the cell. The achievable transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L25/02
Inventor 许威梁乐沈弘赵春明
Owner SOUTHEAST UNIV
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