Method and device for detecting sphere decoding
A technology of spherical decoding and detection method, which is applied to the shaping network in transmitter/receiver, diversity/multi-antenna system, digital transmission system, etc., can solve the problems of difficult hardware implementation and high complexity of spherical decoding and detection method , to achieve the effect of reducing complexity and easy hardware implementation
Inactive Publication Date: 2012-12-26
ST ERICSSON SEMICON BEIJING
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[0006] The purpose of the present invention is to provide a low-complexity and easy-to-hardware implementation of the sphere decoding detection method and device to solve the problems of high complexity and difficult hardware implementation in the prior art.
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0047] The expression of the MIMO system is as follows:
[0048] y=Hx+n
[0049] Among them, y is the received signal, H is the channel matrix, x is the transmitted signal, and n is the channel noise.
[0050] In the traditional spherical decoding algorithm, the selection of the initial radius is very important, too large or too small will not work, because the traditional spherical decoding algorithm uses the ZF (Zero Forcing, zero forcing) solution as the initia...
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The invention discloses a method and device for detecting sphere decoding. The method comprises the following steps that: (A), carrying out QR decomposition on a channel matrix of a received signal; (B), calculating a received signal point as an initial sphere center point according to the received signal and the channel matrix, and carrying out depth first search from a top layer of a received signal constellation tree by taking an initial radius R less than a preset threshold value as a searching radius; (C), determining the number N(i) of reserved constellation points of each layer of the constellation tree by taking the distance from the constellation point to the sphere center point as a new radius when a first constellation point is searched; (D), according to system resources realized by actual hardware, determining the number K(i) of the reserved constellation points of each layer of the constellation tree; and (E), carrying put the breadth first search by taking the smaller value between N(i) and K(i) as the number of the reserved constellation points of each layer of the constellation tree, and outputting a search result. Compared with the prior sphere decoding detection method, the technical proposal ensures easier hardware implementation and reduces complexity.
Description
technical field [0001] The present invention mainly relates to multiple-input-output (MIMO, Multiple-Input Multiple-Output) detection in wireless communication, in particular to a spherical decoding detection method and device. Background technique [0002] With the gradual maturity of wireless communication technology, the number of mobile users is increasing exponentially, and mobile services have expanded from traditional voice services to multimedia services, so spectrum resources are increasingly tight. In response to this situation, a Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) system that can achieve efficient coding, modulation, and signal processing came into being. In the evolution technology (longterm evolution, LTE) or in the evolution version of the 802.16 system technology, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and MIMO technology are widely adopted as key technologies. Compared ...
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IPC IPC(8): H04L1/00H04L25/03H04B7/08
Inventor 李果邓冰
Owner ST ERICSSON SEMICON BEIJING