Soft output sphere decoding method in coding MIMO system based on initial sphere radius
A technology of spherical decoding and spherical radius, which is applied to the shaping network in the transmitter/receiver, baseband system components, etc., can solve the problems of reducing complexity and not being practical enough
Inactive Publication Date: 2014-09-10
XI AN JIAOTONG UNIV
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Obviously, this method needs to search more layers when the number of antennas is large, so it is not practical enough for a large number of antennas. The above two methods are difficult to reduce the complexity as much as possible while ensuring performance.
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[0031] The present invention is described in further detail below in conjunction with accompanying drawing:
[0032] The soft output sphere decoding method based on the initial sphere radius in the coded MIMO system of the present invention comprises the following steps:
[0033] 1) In a coded MIMO system, it is assumed that the transmitter is equipped with N T Antennas, the receiving end is equipped with N R root receiving antennas, where, N R ≥N T , the transmitter sends a symbol vector To the receiving end, the receiving end adopts the method of single-tree search to search, and sets the scope of single-tree search through the initial spherical radius strategy, wherein, the method of setting the scope of single-tree search through the initial spherical radius strategy is: according to the noise Distribution When the radius is initialized to cover at least one leaf node on the receiving end with a probability of (1-ε), the initial spherical radius of the first search is...
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The invention discloses a soft output sphere decoding method in a coding MIMO system based on an initial sphere radius. The soft output sphere decoding method comprises the following steps that (1) in the coding MIMO system, a transmitting terminal is provided with NT antennas, a receiving terminal is provided with NR receiving antennas, NR >=MT, the transmitting terminal transmits a symbolic vector (please see the formula in the specification) to the receiving terminal, the receiving terminal carries out searching through a single-tree searching method, and a single-tree searching range is set through an initial sphere radius strategy; (2) the receiving vector received by the receiving terminal can be expressed as a complex value model (please see the formula in the specification), the receiving terminal obtains log-likelihood ratio information according to the complex value model (please see the formula in the specification), and a decoder decodes the symbolic vector (please see the formula in the specification) sent by the transmitting terminal according to the log-likelihood ratio information. According to the method, the symbolic vector sent by the transmitting terminal is decoded, and meanwhile the searching complexity can be lowered.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a soft output sphere decoding method based on an initial sphere radius in a coded MIMO system. Background technique [0002] In an actual coded MIMO system, in order to improve the spectral efficiency, the detection algorithm of the receiver is a big challenge. In recent years, there have been many studies on high-performance and low-complexity detection algorithms, such as a tree search algorithm based on QR decomposition. According to the search method of tree search, tree search can be divided into three categories: depth first, breadth first, and measure value first. Among them, the first two methods can make better use of the tree structure and thus receive more attention. In the detection of coded MIMO systems, the depth-first algorithm uses the soft-output sphere decoding algorithm, and the breadth-first algorithm uses the soft-output K-best algorithm. Since...
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IPC IPC(8): H04L25/03
Inventor 任品毅王蔚蕾杜清河
Owner XI AN JIAOTONG UNIV