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Sparse channel estimation and pilot optimization method for underwater sound OFDMA uplink communication

A sparse channel and optimization method technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as error level, uneven distribution, and small number of user pilots

Active Publication Date: 2015-07-15
HARBIN ENG UNIV
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Problems solved by technology

Aiming at the problem that the number of user pilots is small and the distribution is uneven in underwater acoustic OFDMA uplink communication, which leads to the error level caused by the traditional interpolation channel estimation method, the present invention proposes a sparse channel estimation and pilot optimization method based on CS

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  • Sparse channel estimation and pilot optimization method for underwater sound OFDMA uplink communication
  • Sparse channel estimation and pilot optimization method for underwater sound OFDMA uplink communication
  • Sparse channel estimation and pilot optimization method for underwater sound OFDMA uplink communication

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[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] Aiming at the problem that the number of user pilots is small and the distribution is uneven in underwater acoustic OFDMA uplink communication, which leads to the error floor of the traditional interpolation channel estimation method, a sparse channel estimation and pilot optimization method based on CS is proposed.

[0045] The technical solution adopted by the present invention to solve its technical problems comprises the following steps:

[0046](1). Based on the underwater acoustic OFDMA uplink communication application, select the multipath delay search range and the oversampling factor that determines the delay resolution, and establish a multi-user CS sparse channel estimation model based on comb pilots at the sending end, and obtain Measure matrix cross-correlation expressions.

[0047] (2). According to the principle of minimizing the cross-...

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Abstract

The invention discloses a sparse channel estimation and pilot optimization method for underwater sound OFDMA uplink communication. The method comprises the following steps: establishing a comb-pilot-based multi-user CS sparse channel estimation model at a sending end to obtain a measurement matrix cross-correlation expression; performing joint optimization on pilot patterns and pilot power at the sending end according to the measurement matrix cross-correlation expression to reduce measurement matrix cross-correlation under a CS channel estimation model; performing multi-user sparse channel estimation through a matching pursuit algorithm under a CS frame at a receiving end by utilizing the multi-user CS sparse channel estimation model and the pilot information about the joint optimization on the pilot patterns and the pilot power. The sparse channel estimation and pilot optimization method for the underwater sound OFDMA uplink communication has the advantage that estimation errors can be reduced.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and in particular relates to a sparse channel estimation and pilot optimization method for underwater acoustic OFDMA uplink communication based on compressed sensing. Background technique [0002] In recent years, Orthogonal Frequency Division Multiple Access (OFDMA) technology, which has the characteristics of flexible resource allocation, high spectrum utilization, and strong multipath resistance, has gradually attracted attention and has been widely used in underwater acoustic media access. Access control (MAC, Media Access Control) protocol design. The OFDMA system can allocate a segment of continuous subcarriers to users, that is, the subband Carrier Assignment Scheme (subband CAS) to achieve spectrum resource sharing; it can also use the interleaved CAS with equal intervals. ) to fully develop the channel frequency diversity gain; it can also flexibly allocate spectrum reso...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L5/00
Inventor 乔钢马璐刘凇佐李雪尹艳玲周锋孙宗鑫聂东虎
Owner HARBIN ENG UNIV
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