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A low-complexity osdm block equalization method based on dual-choice fading channels

A fading channel, 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: 2021-01-05
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 block equalization method based on dual-choice fading channels
  • A low-complexity osdm block equalization method based on dual-choice fading channels
  • A low-complexity osdm block equalization method based on dual-choice fading channels

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Embodiment Construction

[0086]The present invention will now be further described in conjunction with the embodiments and drawings:

[0087]The OSDM low-complexity block equalization method based on time-frequency dual-selection fading channel adopts a complex exponential basis expansion model for channel approximation, and the corresponding composite channel matrix has a circular block-shaped structure. The proposed low-complexity OSDM block equalization method utilizes the above-mentioned channel matrix structure, and is characterized by:

[0088]Step 1: Adopt the complex exponential base extended model to model the time-frequency dual-selective fading channel, and construct the OSDM system model based on the complex exponential base extended model. Specifically, the complex exponential basis expansion model expresses the time-varying channel impulse response in each OSDM block as the superposition of 2Q+1 complex exponential basis functions, namely

[0089]

[0090]Among them, k represents the sampling point index,...

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Abstract

The invention relates to a low-complexity OSDM block equalization method based on a double-choice fading channel, which performs channel approximation based on a complex exponential basis spread model, and the corresponding composite channel matrix has a cyclic partitioned band structure. The proposed low complexity OSDM block equalization method utilizes the above channel matrix structure. Basedon matrix factorization, block diagonalization in channel matrix is realized, and block equalization in transform domain is used to reduce the complexity of the system. Furthermore, a block LDLH decomposition algorithm is designed to avoid the cubic complexity problem caused by the direct inversion of the matrix when the block equalizes the symbol vector estimation. Compared with the existing OSDMreceiving method, the invention reduces the influence of the Doppler spread component of the time-varying multipath on the receiving performance, avoids the increase of the equalization complexity, and improves the adaptability of the OSDM transmission to the double-selected channel.

Description

Technical field[0001]The invention belongs to the field of underwater acoustic communication, and relates to a low-complexity OSDM block equalization method based on dual-selection fading channels, in particular to a low-complexity orthogonal signal division multiplexing block equalization method suitable for time-frequency dual-selection fading channels .Background technique[0002]In view of the complexity of the underwater environment and the low transmission rate of underwater acoustic waves (1500m / s), the underwater acoustic channel is 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 serious Inter-Symbol Interference (ISI) . As a response, Orthogonal Frequency Division Multiplexing (OFDM) and its frequency domain equalization technology have obvious ad...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04B17/382H04B17/391
CPCH04L25/03006H04B17/382H04B17/3912
Inventor 韩晶张玲玲张群飞王玉洁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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