Lattice reduction based retransmission merging method for MIMO (Multiple Input Multiple Output) system

A lattice statute and statute technology, applied in the field of multi-antenna detection, can solve the problems of difficulty in implementation and high complexity

Inactive Publication Date: 2011-08-03
BEIJING UNIV OF POSTS & TELECOMM
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However, the detection method used in this paper is the maximum likelihood detection ML (Maximum Likelihood), although the o

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  • Lattice reduction based retransmission merging method for MIMO (Multiple Input Multiple Output) system
  • Lattice reduction based retransmission merging method for MIMO (Multiple Input Multiple Output) system
  • Lattice reduction based retransmission merging method for MIMO (Multiple Input Multiple Output) system

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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] The present invention is a method for combining retransmissions based on a lattice-based protocol for MIMO systems. The method is to combine all received signal vectors after each retransmission to obtain a combined system model; and then right-hand the combined channel matrix Multiply the transformation matrix obtained by performing lattice-based reduction on the combined channel matrix corresponding to the previous retransmission to obtain the transformed channel matrix; then, use linear detection to directly perform lattice-based reduction on the transformed channel matrix, or use nonlinear Detection performs lattice reduction on the equivalent transformed form of the transformed channel matrix, so as to obtain the lattice reduction result...

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Abstract

The invention provides a lattice reduction based retransmission merging method for an MIMO (Multiple Input Multiple Output) system, which comprises the steps of: after each retransmission, merging all received signal vectors to obtain a merged system model; postmultiplying a merged channel matrix by a transformation matrix obtained by carrying out lattice reduction on the merged channel matrix corresponding to the former retransmission to obtain a transformed channel matrix; subsequently, directly carrying out lattice reduction on the transformed channel matrix by selecting linear detection to obtain a lattice reduction result of the merged channel matrix; and finally, correspondingly detecting the merged system model according to the selected detection method. By fully utilizing all retransmitted receiving information, the invention avoids information loss caused by soft symbol or soft bit merging after each transmission is singly detected, and can obtain better detection performance. Meanwhile, algorithm complexity is effectively reduced by utilizing coherence among the channel matrixes during each retransmission.

Description

technical field [0001] The invention relates to a method for combining retransmissions based on grid-based protocol for MIMO systems, and belongs to the technical field of multi-antenna detection in MIMO systems. Background technique [0002] with N t root transmit antenna and N r In a MIMO system with one receiving antenna, when the signal vector is repeatedly transmitted m times, the receiving end will obtain m different received signal vectors. The system model for each transmission is: y k =H k x+n k (k=1,2,...m)(1); where, y k 、H k and n k Respectively indicate that the dimension of the k-th repeated transmission is N r ×1 received signal vector, dimension is N r ×N t The channel matrix and dimension N r Each element of ×1 is a white Gaussian noise vector with zero mean normal distribution, the natural number subscript k represents the actual number of retransmissions required, N is the maximum value of m, that is, the maximum number of retransmissions allowe...

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Application Information

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IPC IPC(8): H04L1/18H04L1/06
Inventor 赵慧周小平郑斌王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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