ACO-OFDM system channel estimation method based on compressed sensing

A compressed sensing and channel estimation technology, which is applied in the field of channel estimation of ACO-OFDM wireless optical communication systems based on compressed sensing, and can solve the problems that the compressed sensing channel estimation method cannot be directly applied and the research on the application of compressed sensing theory is insufficient.
CN106911622AInactive Publication Date: 2017-06-30CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV OF POSTS & TELECOMM
Publication Date
2017-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides an ACO-OFDM wireless optical communication system channel estimation method based on compressed sensing, and belongs to the field of intensity modulation optical communication. The channel estimation method is used to solve the problem that during pilot based channel estimation, a pilot symbol causes a bandwidth utilization rate to be reduced. According to the method provided by the present invention, channel estimation technology based on the compressed sensing is combined with the ACO-OFDM system. Firstly, the pilot is enabled to have Hermitian symmetry, a pilot allocation scheme is optimized by minimizing a DFT sub-matrix cross-correlation squared sum, and an ACO-OFDM system pilot allocation optimization algorithm is provided. Then, a channel response is estimated by using an improved variable step sparse degree adaptive matching tracking algorithm, the improved algorithm can improve estimation accuracy and calculation speed. Finally, an iterative correction algorithm is used to further improve the estimation accuracy. Compared with the traditional pilot based channel estimation method, the method can effectively reduce the number of pilot symbols, and improve the system bandwidth utilization rate.
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Description

technical field

[0001] The invention belongs to the field of intensity modulation optical communication, in particular to a channel estimation method for an ACO-OFDM wireless optical communication system based on compressed sensing. Background technique

[0002] Wireless optical communication has the advantages of free spectrum resources, huge available bandwidth, simple system equipment, small size, good confidentiality and no electromagnetic interference. The capacity and bandwidth requirements of communication systems are getting higher and higher, and wireless optical communication has shown its application value in communication systems, see the literature: "Boucouvalas A, Chatzimisios P, Ghassemlooy Z, et al.Standards for indoor Optical Wireless Communications[J ].IEEE Communications Magazine, 2015,53(3):24-31." The wireless optical OFDM proposed in the document "Gonzalez O, Perez-JimenezR, Rodriguez S, et al. OFDM over indoor wireless optical channel[J]. IEE Proceedi...

Claims

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