Multi-sampling-rate self-adaptive balancing technology for time-varying channel of communication system of high relative bandwidth

Abstract

A multi-sampling-rate self-adaptive balancing technology for a time-varying channel of a communication system of high relative bandwidth belongs to the technical field of communication engineering. The phase and filtering weight are adjusted with aid of a Turbo soft decoder in a repeated brush type update process. A Resampling structure has a convergence effect towards 1 relative to an Eigenvalue of a channel matrix, and the condition number of the channel matrix is effectively improved. After filtering, a constellation graph of filtering symbols is observed to find a sending symbol for BPSK, a structure with the Resampling structure can be used to recover constellation distribution of BPSK clearly, and repeated brush type update can further optimize the filtering effect. The technology can be used to prompt development in the fields including seabed petroleum exploration, submarine underwater communication, underwater sensor remote collection, ocean pollution monitoring, coast underwater monitoring network and underwater unmanned robot control.

Description

Technical field [0001] communication engineering. Background technique [0002] Most wireless communication systems adopt low relative bandwidth systems, that is, the ratio of the frequency absolute bandwidth of the communication system to the center frequency of the carrier is relatively low (for example, <10%). For example, the center frequency of the currently widely used WiFi wireless local area network equipment based on the IEEE 802.11 standard is f c =2.4GHz, while its standard baseband bandwidth is only W=20MHz, and its relative bandwidth is only about λ=W / f c = 0.83%. In contrast, the ratio of the absolute bandwidth of a communication system with high relative bandwidth to the center frequency of the carrier generally exceeds 25%, such as an ultra-wideband radar system pursuing high resolution. Other communication systems with high relative bandwidth include super / extremely low frequency radio communication systems in the military field, and long-distance unde...

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Problems solved by technology

The applicant published an academic paper "Multi-Rate Block Transmission Over Wideband Multi-Scale Multi-Lag Channels" on IEEE Transactions on signal processing and an academic paper "Iterative equalization for OFDM systems over wideband Multi-Scale Multi-Lag channels" made use of the advantages of "multi-scaling" to design channel equalization technology, but these works need to assume that the channel information is known, or pre-estimate this multi-scaling channel (this estimated to be very difficult), so it is not very practical

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