Bandwidth compressed high-spectral-efficiency multi-carrier communication method

Abstract

The invention discloses a bandwidth compressed high-spectral-efficiency multi-carrier communication method, belonging to the field of multi-carrier communication technology. The method comprises the following steps: serially connecting external coding and multi-carrier modulation processing at a transmitter through pseudo-random interleaving, and equalizing to a mode of encoding signals through aserially concatenated Turbo code; performing decoding and interference cancellation at a receiver by using an iterative decoding structure of a serial Turbo code, serially connecting internal decodingprocessing and external decoding processing through pseudo-random interleaving and de-interleaving, and continuously exchanging soft information with each other to achieve iteration, wherein the internal decoding mode performs iterative estimation and cancellation for ICI by using a successive interference cancellation method, the external decoding mode decodes external codes by using a soft input and soft output method, and thus the impact of Gaussian white noises of channels can be resisted. Compared with existing methods, by adopting the method disclosed by the invention, a better detection performance can be obtained by using a lower computation complexity, and meanwhile, a large multi-carrier communication system with more sub-carriers can be adapted.

Description

technical field [0001] The invention belongs to the multi-carrier communication technology in the field of wireless communication, and in particular relates to a bandwidth-compressed non-orthogonal multi-carrier modulation communication method. Background technique [0002] With the rapid development of the information age, the amount of data transmitted through wireless is increasing exponentially, and the demand for high-speed data transmission is becoming more and more urgent. In order to increase the data transmission rate, there are two methods: First, under the premise of low efficiency of spectrum resources, increasing the bandwidth is a solution to improve the capacity of the communication system. However, the current wireless communication spectrum resources are increasingly scarce and cannot be unlimited. Therefore, the current situation of scarce spectrum resources is difficult to meet the increasing data volume, which has become a bottleneck in the development of...

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Problems solved by technology

[0004] Literature "Darwazeh I, Rodrigues M.A Spectrally Efficient Frequency Division Multiplexing Based Communications System [C]. Inowo'03, International Ofdm-Workshop.2003.", "Kanaras I, Chorti A, Rodrigues M, et al. An optimum detection for a spectrally efficient non orthogonal FDM system[C].Proceedings of the13th International OFDM Workshop,Hamburg.2008:65-69."It is proposed that from the perspective of detection performance, maximum likelihood sequence detection (ML) is the most ideal decoding detection method for SEFDM systems , but the complexity of the ML algorithm is too high and not easy to implement

Literature "Kanaras I, Chorti A, Rodrigues M.et al.Analysis of Sub-OptimumDetection Techniques for Bandwidth Efficient Multi-Carrier CommunicationSystems[C].Cranfield Multi-Strand Conference:Creating Wealth Through Research and Innovation.2008,6:505." The application of simple linear detection methods in SEFDM is proposed. The most common ones are zero-forcing detection (ZF) and minimum mean square error detection (MMSE). These two methods are usually used in the decoding operation of traditional OFDM systems. However, the performance used in SEFDM systems is far from meeting the requirements

The fixed sphere algorithm (Truncated Singular Value Decomposition-fixed sphere decoding, TSVD-FSD) and iterative fixed sphere algorithm (Iterative detection-FSD, ID-FSD) based on the singular value decomposition method have high decoding efficiency, but only Limited to small systems with fewer subcarriers

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