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Decoding method of multi-cell, multi-user and multi-antenna system

A multi-cell, multi-user, multi-antenna system technology is applied in the field of wireless communication and wireless communication multi-antenna, which can solve the problems of non-orthogonal pilot signals, poor performance, and poor data decoding performance.

Inactive Publication Date: 2015-02-04
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

The pilot signals are required to be orthogonal to each other. If the pilot signals are non-orthogonal or even multiplexed, it will cause pilot pollution.
For example, users in different cells use the same pilot in the same frequency band and at the same time, the performance of channel state estimation will be very poor, and the performance of data decoding will also be very poor

Method used

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  • Decoding method of multi-cell, multi-user and multi-antenna system
  • Decoding method of multi-cell, multi-user and multi-antenna system
  • Decoding method of multi-cell, multi-user and multi-antenna system

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Embodiment Construction

[0023] The theoretical basis of this design method is introduced as follows:

[0024] Record the real channel as H, then the signal model received by the base station can be recorded as:

[0025] Y = ρ HBX + W

[0026] Among them, H can be expressed as a random matrix of M×L, each element of which is a complex Gaussian random variable with a mean value of zero and a variance of 1, and each pair is independent of each other; the sending signal matrix X is a matrix of L×T, can be expressed as [x 1 ,x 2 ,...x T ], where x i (1≤i≤T) is a column vector of X, and each element is uniformly taken from the standard 4-QAM; the receiving end receives the M×T received signal matrix Y, which can be expressed as [y 1 ,y 2 ,...y T ], where y i is a column vector of Y; B is a diagonal matrix, B=diag{β 1 ,β 2 ,…β L}, element β on the diagonal i Represents the large-scale fading factor from the user t...

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Abstract

The invention relates to a decoding method of multi-cell, multi-user and multi-antenna system. The decoding method includes two steps. The first step is to design a training sequence header: a line (img file='dest_path_image 004.TIF' wi='13' he='16' / ) in front of (img file='2014106135712100004 dest_path_image 002.TIF' wi='24' he='24' / ) is set as the training sequence header, elements in the first line of (img file=' 53509 dest_path_image 002.TIF' wi='24' he='24' / ) are (img file=' dest_path_image 006.TIF' wi='8' he='16' / ) respectively, the lines from the second line of (img file=' 908332 dest_path_image 002. TIF' wi='24' he='24' / ) to (img file=' 688070 dest_path_image 004.TIF' wi='13' he='16' / ) are marked as (img file=' dest_path_image 008.TIF' wi='22' he='24' / ), wherein elements in (img file=' 270230 dest_path_image 008.TIF' wi='22' he='24' / ) can be (img file=' 22285 dest_path_image 006.TIF' wi='8' he='16' / ) or (img file=' dest_path_image 010.TIF' wi='21' he='16' / ), and vectors in all rows of (img file=' 844747 dest_path_image 008. TIF' wi='22' he='24' / ) are different from each other. The second step is to estimate a sent signal matrix (img file=' dest_path_image 014. TIF' wi='18' he='18' / ) through a received signal matrix (img file=' dest_path_image 012. TIF' wi='18' he='18' / ) on the basis of a system model. The decoding method achieves estimation of sent signals in the multi-cell, multi-user and multi-antenna system by aid of a few pilot signals on the condition that the receiving party does not know the channel state information.

Description

technical field [0001] The invention belongs to the field of wireless communication technology, in particular to the field of wireless communication multi-antenna technology, in particular to a decoding method used in a multi-cell multi-user multi-antenna system. Background technique [0002] The multi-cell multi-user multi-antenna system is the key technology for the future development of wireless communication. In the multi-antenna system, the base station is equipped with a large number of antennas, and these antennas serve a relatively small number of single-antenna mobile users at the same time. During communication, if the receiver knows the channel state information, the multi-antenna system can easily achieve high data transmission rate and energy efficiency. However, the channel state information is unknown, so the estimation of the channel state information is extremely important in a multi-antenna system. [0003] Before the sender sends information, it first sen...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04L1/00
CPCH04B7/0851H04L1/001
Inventor 王海泉刘杨懿张婉许倩
Owner HANGZHOU DIANZI UNIV
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