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Joint distribution method of limited feedback number of bits in multi-point cooperation system

A technology of feedback bit and multi-point cooperation, which is applied in the direction of baseband system components, electrical components, wireless communication, etc., and can solve the problem of total system data rate loss and other issues

Active Publication Date: 2012-12-05
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The total data rate of the system will be lost due to the quantization error introduced by the channel feedback

Method used

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  • Joint distribution method of limited feedback number of bits in multi-point cooperation system
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  • Joint distribution method of limited feedback number of bits in multi-point cooperation system

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Embodiment Construction

[0069] Below in conjunction with accompanying drawing, the method of the present invention is further described: present embodiment is carried out under the premise of technical solution of the present invention, has provided detailed embodiment and concrete operation process, but protection scope of the present invention is not limited to following Example.

[0070] In this embodiment, the number of antennas M of the main base station and the auxiliary base station is 1 = M 2 =M=4, the number of user antennas is N=1, the backward and forward channels are both Rayleigh (Rayleigh) flat fading, and the receiving noise at the receiving end is complex white Gaussian noise with zero mean and unit variance, σ 2 =1, the signal-to-noise ratio of the forward channel is the equivalent SNR of the user at the edge of the cell, the cell radius is R=500m, and SNR=-10□10dB.

[0071] This embodiment includes the following steps:

[0072] In the first step, the primary base station transmit...

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Abstract

The invention provides a joint distribution method of limited feedback number of bits in a multi-point cooperation system. The method comprises the following steps that: a main base station and an assistant base station emit training sequences to a user, the user conducts channel estimation processing to obtain an estimated channel between the main base station and the assistant base station; the user feeds the power information of a receiving end back to the base station, and the main base station calculates a bit distribution scheme according to the information; the main base station feeds the bit distribution result back to each user; the user quantizes the channel information obtained in channel estimation according to the distributed feedback number of bits, and feeds numeral sequence back to the main base station; the main base and the assistant base station perform zero-forcing pre-coding matrix calculation according to the feedback channel status information; and the main base station and the assistant base station perform linear preprocessing to the user data and send the user data to the user. According to the joint distribution method of limited feedback number of bits in the multi-point cooperation system, a feedback bit joint distribution method is adopted to distribute feedback number of bits of the system to each channel of each user in a self-adaptive manner, and the cell throughout rate and the system total data rate are improved.

Description

technical field [0001] The invention relates to a method in the field of wireless communication, in particular to a method for jointly allocating limited feedback bits between users and channels in a coordinated multi-point system. Background technique [0002] The research on the coordinated multi-point (CoMP) system is a recent hot issue. In the 3GPP (3rd Generation Partnership Project, the third generation mobile communication partner project) LTE-A (Long Term Evolution-Advanced, long-term evolution-advanced) standard research listed as a major research focus. Using the coordinated multi-point technology and considering the data transmission problem under the multi-base station cooperative mode, the throughput rate of the cell edge users can be greatly improved, and then the average throughput rate of the entire system can be improved. The multi-cell cooperative system includes two cooperative modes, namely joint transmission (Joint Transmission) and joint beamforming / sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W72/12H04L25/02
Inventor 秦佳美伊海珂黄剑俞晖罗汉文
Owner SHANGHAI JIAO TONG UNIV
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