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Single-ended frequency domain beam searching method based on compressed sensing

A technology of compressed sensing and search methods, applied in space transmit diversity, diversity/multi-antenna systems, etc., can solve the problems of huge number of searches and reduce the number of searches

Inactive Publication Date: 2014-11-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The staged beam search strategy can greatly reduce the number of searches, but when the antenna array is large, the number of searches required is still huge

Method used

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  • Single-ended frequency domain beam searching method based on compressed sensing
  • Single-ended frequency domain beam searching method based on compressed sensing
  • Single-ended frequency domain beam searching method based on compressed sensing

Examples

Experimental program
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Embodiment 1

[0053] The total number of subcarriers is 512, the sampling frequency is 1GHz, both device 1 and device 2 have 20 antennas, and the number of beams in the codebook is 40. When constructing the dictionary, the interval is 5 degrees. When using the multi-task orthogonal matching pursuit algorithm, the threshold value α is 0.05, and CM4 is a non-line-of-sight channel with multiple multipaths.

[0054] Such as figure 2 As shown, the probability of success performance curve of 802.11.ad channel beam search, figure 2 The middle abscissa is the number of transmit beam vectors used by device 1 and the number of receive vectors used by device 2. The total number of searches is the product of the two. Under the condition that the signal-to-noise ratio is 0dB, each point is simulated 1000 times.

[0055] according to figure 2 It can be seen that the probability of success increases with the number of measurements.

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a method for searching for the optimal beam vector on the basis of compressed sensing in a multi-antenna orthogonal frequency division multiplexing (OFDM) communication system. The method is used for searching for the optimal beam vector through single-ended frequency domain beams in the multi-antenna OFDM communication system on the basis of compressed sensing. According to the method, the problem of beam searching is changed into a compressed sensing problem according to sparsity of departure angles and arrival angles, different transmission vectors and different receiving vectors are used by a transmission end and a receiving end, and the receiving end independently determines the optimal transmission / receiving beam vector. The method is quite wide in application range, and can be used for all slow fading sight distance or non-sight-distance channels.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for searching an optimal beam vector by using compressed sensing in a multi-antenna Orthogonal Frequency Division Multiplexing (OFDM) communication system. Background technique [0002] UWB system and 60GHz system are mainly used for short-distance high-speed transmission, and have a wide range of applications, including wireless personal area network (WPAN, Wireless Personal Area Network), wireless high-definition multimedia interface, medical imaging, vehicle radar and so on. In order to meet the needs of high data rate and high system capacity, etc., UWB systems and 60GHz systems often use multi-antenna multi-carrier technology for data transmission. [0003] Multiple antenna technologies include multiple input multiple output (Multiple Input Multiple Output, MIMO), multiple input single output (Multiple Input Single Output, MISO) and single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
Inventor 王梦瑶成先涛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA