Soft output parallel stack MIMO (multiple input multiple output) signal detection method

Abstract

The invention discloses a soft output parallel stack MIMO (multiple input multiple output) signal detection method, which comprises the following steps: S1, performing QR decomposition on a channel matrix of an MIMO system; S2, performing parallel expansion on nodes in different stacks by adopting a metric-first tree search method under the condition that nodes except leaf nodes on each layer correspond to one stack; working out the log-likelihood ratio of each bit by utilizing a double maximum posterior probability method according to maximum likelihood path metric assumption obtained in the step 2 and candidate likelihood path metric assumption. According to the soft output parallel stack MIMO signal detection method disclosed by the invention, an independent stack is distributed for each layer through tree search, and therefore, the calculated amount of ranking of the nodes in the stacks is reduced, and the storage space requirement is reduced. Meanwhile, the parallel expansion is performed on all the stacks, so that the hardware efficiency is increased, and the complexity of MIMO detection is reduced and the storage requirement is lowered while the signal detection performance is ensured.

Description

technical field [0001] The present invention relates to the technical field of MIMO (Multi-Input Multi-Output, multiple-input multiple-output) transmission, in particular to a soft-output parallel stack MIMO signal detection method. Background technique [0002] Both the transmitting end and the receiving end use MIMO (Multiple Input Multiple Output) technology with multiple antennas, which can greatly improve the system capacity and transmission reliability without increasing frequency and power overhead. In particular, the spatial multiplexing MIMO technology makes the transmission rate of the system increase linearly with the increase of the number of antennas, which has attracted extensive attention from academia and industry. With the wide application of high-speed data services such as Internet and multimedia in wireless communication systems, next-generation mainstream wireless communication systems such as IMT-Advanced (4G) and IEEE802.11ac need to adopt high-order a...

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Problems solved by technology

"A74.8mW soft-output detector" published by C.-H.Liao, T.-P.Wang and T.D.Chiueh in "IEEE Journal of Solid-State Circuits" vol.45, no.2, 411–421, Feb.2010 IC for 8×8spatial-multiplexing MIMO communications (a 74.8mW soft output detector integrated circuit for 8×8 spatial multiplexing MIMO systems, 2010 IEEE Transactions on Solid State Circuits, Issue 2, pages 411-421) ", by designing a DEAP storage structure, the number of comparison and sorting operations is reduced, but it still needs to consume a large storage space and detection delay, which limits the throughput of the detector

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