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Method and device for searching soft sphere decoding in single-tree mode

A soft-spherical decoding and single-tree technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve problems such as high complexity, large number of nodes, and failure to meet performance requirements, so as to reduce complexity and ensure performance effect

Active Publication Date: 2013-09-25
MORNINGCORE TECH CO LTD
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Problems solved by technology

[0027] Although STS has its own node deletion rules, under the condition of high-order modulation and multi-antenna transmission and reception, the number of nodes that need to be visited is still large, and the complexity is still high
The current way to reduce complexity is to delete nodes by setting the maximum value of soft bits. If the maximum value is set too small, the performance requirements cannot be met, and if it is set too large, the complexity will not be reduced at all.

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[0055] The single tree search soft sphere decoding method and device provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form, and are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention.

[0056] The core idea of ​​the present invention is to provide a single tree search soft sphere decoding method and device, through the weight of the current node and the maximum weight of the obtained K paths For comparison, that is to introduce a maximum weight that can be determined As a comparison benchmark for single-tree node pruning, it avoids the entire single-tree search in the existing method by setting the maximum value of soft bits to perform ...

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Abstract

The invention provides a method and device for searching soft sphere decoding in a single-tree mode. Comparison is carried out through the weight of a current node and the maximum weight of the obtained K routes, namely, a comparison level which can be definitely obtained is introduced, and the maximum weight of the comparison level is used as a single-tree node to conduct deletion. Therefore, under the premise that the performance loss can be received, node deletion is further carried out, the performance of searching the soft sphere decoding in the single-tree mode is ensured, and complexity is further reduced.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, relates to signal detection, in particular to a single tree search soft sphere decoding method and device. Background technique [0002] MIMO-OFDM system signal detection algorithm is divided into two types: linear detection algorithm and nonlinear detection algorithm. Commonly used linear algorithms mainly include zero forcing (ZF) and minimum mean square error (MMSE), which have the lowest complexity but the worst performance. Commonly used nonlinear detection algorithms mainly include maximum likelihood (ML), interference cancellation (IC), detection algorithms based on QR decomposition, and spherical decoding (SD). Among them, ML is the optimal detection algorithm in MIMO-OFDM systems, but it is complex Highest accuracy, which is not conducive to real-time processing; interference elimination and detection algorithms based on QR decomposition achieve suboptimal detection results...

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Application Information

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IPC IPC(8): H04L1/00H04L1/06
Inventor 黄剑华王乃博
Owner MORNINGCORE TECH CO LTD
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