Parallel MIMO (multiple input multiple output) signal detection method based on zero forcing predetection

Abstract

The invention discloses a parallel MIMO (multiple input multiple output) signal detection method based on zero forcing predetection, which is mainly used for solving the problems that the existing MIMO receiver detection method has high complexity and is not favourable for realizing high-speed processing. The specific steps are as follows: (1) according to a channel transmission matrix, determining the detection sequence of transmission signals; (2) calculating the zero forcing predetection solution of the first-layer detection signals; (3) determining a candidate traversal symbol; (4) eliminating the interference of the fir-layer detection signals; (5) estimating the zero forcing of the second-layer detection signals; (6) according to the zero forcing estimation, removing the interference of the second-layer detection signals, thus obtaining residual vectors; (7) calculating the Euclidean distance of the residual vectors; and (8) outputting a candidate traversal symbol corresponding to parallel branches with the minimum Euclidean distance and zero forcing estimation serving as final detection output. The invention has the advantages that the complexity of the traditional paralleldetection method is lowered by combined zero forcing predetection, the performance loss is small and rapid realization is ensured, and the method can be used for the MIMO detection of an LTE (long term evolution) receiver.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a signal detection method of a multiple-input multiple-output MIMO system, which can be used for a MIMO receiver in a next-generation broadband wireless communication system. Background technique [0002] The signal detection of MIMO system is a core technology in the next generation broadband wireless communication system. At present, many MIMO signal detection methods have been proposed, including maximum likelihood ML detection, zero-forcing ZF detection, minimum mean square error MMSE detection, spherical SD detection, K-best detection, and parallel PD detection. Among them, the ML detection method has the best performance, but the computational complexity of the ML detection method is too high to be applied in practice; while the linear detection methods such as ZF and MMSE have relatively low complexity, but their performance is poor; spherical SD detection , K-best det...

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Problems solved by technology

Among them, the ML detection method has the best performance, but the computational complexity of the ML detection method is too high to be applied in practice; while the linear detection methods such as ZF and MMSE have relatively low complexity, but their performance is poor; spherical SD detection , K-best detection, PD detection and other methods are close to the performance of ML detection methods, but spherical SD detection is not conducive to parallel processing, and the processing speed is difficult to improve; the parallel PD detection method proposed by Sanhae Kim can be used in WiMAX system uplink 2 transmission 2 Received signal detection, but this method needs to traverse all constellation symbols for one layer of signals. When the modulation order is high, the complexity is still high; Min Chuin Hoo patent (07523037) "Reduced complexity detector for multiple- "antenna systems" proposes to use a detection method with low complexity to reduce the search set of all possible transmission symbols. Reuven patent (7720169) "Multiple-input multiple-output (MIMO) detector incorporating efficient signal point search and softinformation refinement" In this paper, this idea is used to reduce the number of branches of the tree search method, and a k-best detection method for 2-transmit 2-receive MIMO systems is proposed, but this method is also not suitable for high-speed parallel processing

[0003] For the LTE-A standard of the next-generation broadband wireless communication system, the typical antenna configuration is 2 transmissions and 2 receptions. The MIMO detection method needs to be processed in parallel to meet the high-speed requirements of the system. to meet this high-speed

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