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A low-complexity osdm serial equalization method based on dual-selection fading channels

A fading channel and low-complexity technology, applied in the baseband system, baseband system components, shaping network in the transmitter/receiver, etc., can solve the problems of destroying the orthogonality between OSDM symbol vectors and system performance degradation

Active Publication Date: 2021-03-23
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, in time-frequency dual selective fading channels, Doppler spreading destroys the orthogonality between OSDM symbol vectors, resulting in inter-vector interference (Inter-Vector Interference) similar to OFDM inter-carrier interference (Inter-Carrier Interference, ICI). ,IVI), the system performance will decrease significantly

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  • A low-complexity osdm serial equalization method based on dual-selection fading channels
  • A low-complexity osdm serial equalization method based on dual-selection fading channels
  • A low-complexity osdm serial equalization method based on dual-selection fading channels

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Embodiment Construction

[0088] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0089] The OSDM low-complexity serial equalization method based on time-frequency double-selective fading channel adopts the complex exponential radix expansion model for channel approximation, and the corresponding composite channel matrix has a cyclic block band structure. The proposed low-complexity OSDM serial equalization method utilizes the channel matrix structure described above and is characterized by:

[0090] (1) The diagonalization of each block in the channel matrix is ​​realized based on matrix decomposition, and the serial equalization in the transform domain is used to reduce the system complexity by using this diagonal structure;

[0091] (2) A block iterative matrix inversion algorithm is further designed, which avoids the cubic complexity problem caused by the direct inversion of the matrix when serially equalizing the estimation of each symbol...

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Abstract

The invention relates to a low-complexity OSDM (Orthogonal Signal Division Multiplexing) serial equalization method based on a double-selective fading channel. Channel approximation is performed basedon a complex exponential basis expansion model, and a corresponding composite channel matrix has a circulant block banded structure. The low-complexity OSDM serial equalization method proposed by theinvention uses the above channel matrix structure. Each block in the channel matrix is diagonalized based on matrix decomposition, and transformation domain serial equalization is adopted to reduce the system complexity by utilizing a diagonal structure; and in addition, a block iterative matrix inversion algorithm is further designed, so that the problem of cubic complexity caused by the matrixdirect inversion during serial equalization of symbol vector estimation is avoided. Compared with an existing OSDM receiving method, the influence of a time-varying multipath Doppler spread componenton the receiving performance is reduced, the increase of the equalization complexity is avoided, and the adaptation of an OSDM transmission system to the time-frequency dual-selective fading channel is improved.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and relates to a low-complexity OSDM serial equalization method based on dual-selection fading channels, in particular to a low-complexity orthogonal signal division multiplexing serialization method suitable for time-frequency dual-selection fading channels balanced approach. Background technique [0002] Given the complexity of the underwater environment and the low transmission rate (1500m / s) of underwater acoustic waves, underwater acoustic channels are recognized as one of the most challenging wireless communication media. Specifically, the low-speed propagation of acoustic signals in water will cause long-term multipath delay spread, which usually spans dozens of underwater acoustic communication symbol intervals, resulting in severe Inter-Symbol Interference (ISI) . In response, Orthogonal Frequency Division Multiplexing (OFDM) and its frequency domain equalization techno...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04L25/03
CPCH04B13/02H04L25/03006H04L25/03012H04L25/03159
Inventor 韩晶张玲玲张群飞王玉洁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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