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Adaptive feeding back method of multi-user system under Rice channel

A multi-user system and channel technology, applied in the limited feedback field of Rice flat and slow fading channel, can solve the problem of wasteful feedback overhead

Inactive Publication Date: 2011-12-14
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the Ricean channel, the channel vector directions are no longer isotropic distribution but concentrated in a certain direction area, so this limited feedback method designed for Rayleigh channel will still lead to waste of feedback overhead

Method used

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  • Adaptive feeding back method of multi-user system under Rice channel
  • Adaptive feeding back method of multi-user system under Rice channel
  • Adaptive feeding back method of multi-user system under Rice channel

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Embodiment 1

[0041] In the multi-input multi-output multi-user system of this embodiment, a downlink multi-user MIMO system with 100 users is adopted in the adaptive feedback method for the Rice channel, and the base station is equipped with M=4 transmitting antennas, and each user is equipped with 1 receiving antenna , so each user's channel h k Both are a 1×4 vector. Assume that each user channel vector obeys the independent and identically distributed Rice distribution, and the maximum number of bits fed back by the user to the base station in each time slot is FB=8bits, then the initial random vector codebook set size of the base station and the user end is 256, and the constant The threshold value ε=0.05, and the constant factor σ=0.35 in the transmission user set selection algorithm.

[0042] The specific operation steps are as follows:

[0043] The base station uses the uplink channel estimation to obtain the average channel of each user channel; compared with the instantaneous in...

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Abstract

The invention discloses a self-adaptive feedback method aiming at rician channels in a multi-input and multi-output multi-user system, which is characterized in that channel mean information of each user known by a base station is used for calculating a threshold value chosen by the codeword; the base station and each user end utilize respective threshold value to delete the codeword which is next to the channel vector direction of the user and has small probability in an initial codebook for each user; each user end is based on the corresponding user end codebook to quantize the channel vector direction; the user can feedback channel gain and vector index based on the user end codebook in each time slot to the base station; when the user end codebook is an empty set, the user can only feedback the channel gain and the base station can rebuild the channel of users according to the codebook of each user in the base station end; when the codebook of the corresponding user is the empty set, the base station uses the vector direction information of the channel mean value for rebuilding the channels. In the rician channels, the method can lower the feedback expense and improve the throughput of the system; besides, the method is of low complexity and suitable for being used in a practical system, thus reducing the use cost.

Description

technical field [0001] The invention belongs to the technical field of multiple-input multiple-output (MIMO) multi-user systems in wireless communication, and particularly relates to a limited feedback method for Rician flat and slow fading channels. Background technique [0002] The multi-user selective space division multiplexing method in the downlink MIMO system is an effective method to improve the throughput of the wireless communication system. A zero-forcing beam based on "International Institute of Electronics and Electrical Engineers" (IEEE Journal on Selected Areas in Communications (JSAC), Special Issue on4G Wireless Systems, vol.24, issue3, Mar.2006, pp.528-541) proposed The multi-user selection method of multi-input multi-output system based on shaping (ZFBF) approached the upper limit of throughput in MIMO multi-user system with lower computational complexity. However, this method requires all users in the system to feed back the accurate value of their chann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/06H04B7/08
Inventor 杨亥娟邱玲
Owner UNIV OF SCI & TECH OF CHINA
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