Survival constellation point choosing method and QRM-maximum likehood detection (QRM-MLD) signal detection method
A technology of surviving constellations and constellation points, which is applied in the field of wireless communication technology, can solve the problems of small subsets of surviving constellations, performance degradation, and inability to effectively reduce complexity, etc., and achieve the effect of reasonable performance and complexity and guaranteed effectiveness
Inactive Publication Date: 2013-07-03
CHONGQING CYIT COMM TECH
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[0021] The method of the present invention for generating the surviving constellation subset in the prior art either the surviving constellation subset is too large to effectively reduce the complexity, or the surviving constellation subset is too small to include all symbols to calculate the constellation required for soft bit measurement, resulting in performance degradation problem, the present invention provides a survivor constellation point selection method and a QRM-MLD signal detection method
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[0045] In order to clearly illustrate the solution of the present invention, preferred embodiments are given below and the present invention is described in detail in conjunction with the accompanying drawings.
[0046] The schematic diagram of MIMO system structure is as follows figure 2 As shown, let the system have n R transmit antennas, n T a receiving antenna. After the data is modulated and coded by the modulation encoder, it is sent out through the antenna. At the receiving end, the receiving antenna receives the signal and noise transmitted by each transmitting antenna. Assuming that the noise is Gaussian white noise, the channel fading on each antenna obeys the Rayleigh distribution. As long as the distance between the receiving antenna array and the transmitting antenna array meets certain requirements, then The fading between antennas is independent of each other. On the receiving antenna, the noise received by each antenna also obeys independent distribution. ...
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The invention relates to the technical field of wireless communication and provides a survival constellation point choosing method. The survival constellation point choosing method comprises the steps that n QAM modulation constellation patterns are divided into n parts, each part comprises one constellation point, a constellation point belonging to the same part is chosen according to the positions in the constellation patterns, and log2n nearest-distance constellation points used for calculating soft bite measurement are chosen according to the chosen constellation. The invention further provides a QRM-maximum likehood detection (QRM-MLD) signal detection method. A survival constellation point assembly comprises all constellation points used for soft information measurement calculation and guarantees soft information calculation accuracy. The survival constellation point choosing method fully uses the characteristics of constellation diagram reflection. The chosen constellation points used for soft information measure calculation are close to pre-detection results so as to guarantee effectiveness of the required constellation points. Based on a detected signal to noise ratio (SNR) principle, survival constellation point assemblies are increased in a self-adaptive mode. Thus, performance and complexity can be compromised reasonably.
Description
technical field [0001] The present invention relates to the field of wireless communication technology, in particular to a method for selecting surviving constellation points and a maximum likelihood (QRM-MLD for short) signal detection method combined with QR decomposition and M algorithm, which belongs to the multiple-input multiple-output (MIMO) system The signal detection method under the present invention can be applied to high-speed wireless communication systems under various cellular systems and high-throughput wireless local area network systems, and is especially suitable for signal detection under high-speed vertical layered space-time systems. Background technique [0002] As a solution that can meet the high-capacity requirements of future wireless communication systems, the MIMO system has received great attention. In the MIMO system, the transmitting end uses multiple antennas to transmit signals, and the receiving end uses multiple antennas to receive signals...
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IPC IPC(8): H04W24/00
Inventor 李玉闩谭舒
Owner CHONGQING CYIT COMM TECH