Method and device for selecting reserved constellation point and sphere decoding method and device
A spherical decoding, candidate constellation point technology, applied in the direction of shaping network, digital transmission system, baseband system components in transmitter/receiver, etc., can solve the problem of high computational complexity, improve flexibility and reduce complexity degree of effect
Inactive Publication Date: 2012-12-05
ST ERICSSON SEMICON BEIJING
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[0005] Although the computational complexity of spherical decoding detection has been reduced to a certain extent compared with ML detection, it needs to calculate the Euclidean distances of all constellation points on the constellation map separately, and needs to be sorted according to the Euclidean distances, so the computational complexity is still relatively high. high
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[0069] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0070] refer to figure 1 , the method for selecting and retaining constellation points according to the embodiment of the present invention includes the following steps:
[0071] Step 101: Divide the constellation diagram into a plurality of square regions centered on the constellation points and a plurality of edge regions;
[0072] Specifically, each constellation point corresponds to a square area, and the side length of the square is the minimum distance between the constellation points. After the square area division of each constellation point is completed, each side of the square is extended, and the obtained result does not include The area of the constellation points is called the edge area. Taking 16QAM modulation as an example, the di...
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The invention provides a method and a device for selecting reserved constellation point, wherein the method comprises the following steps: dividing a constellation graph into a square zone with a plurality of constellation points as centers and a plurality of marginal zones; equalizing the received signal to obtain reference signal point; determining the optimal constellation point according to the zone where the reference signal point is positioned and regarding a constellation point adjacent to the optimal constellation point in the constellation graph as a candidate constellation point; with the optimal constellation point as the circle center, dividing the constellation graph into a plurality of sizeable angular zones; determining the priority of the candidate constellation point according to the relative position between the angular zone where the candidate constellation point is positioned and the angular zone where the reference signal point is positioned; and selecting reserved constellation point from the candidate constellation points according to the priority from high to low. The invention further provides a sphere decoding method and device. The invention can reduce complexity in MIMO detection without influencing the MIMO detection performance.
Description
technical field [0001] The invention relates to multiple-input multiple-output (MIMO) detection in the field of wireless communication, in particular to a method and device for selecting and retaining constellation points, and a spherical decoding method and device. Background technique [0002] The MIMO system uses multiple antennas at both the transmitting end and the receiving end, thereby realizing the transmission and reception of multiple data streams at the same time and in the same frequency band. Compared with the traditional single-input-output (SISO) system, the use of MIMO technology can Improve the system capacity and signal rate, however, the complexity of MIMO signal detection is much higher than that of traditional SISO signal detection. [0003] Theoretically, MIMO signals can be detected by a maximum likelihood (ML) detection method. However, the number of constellation diagram points that need to be traversed for maximum likelihood detection increases exp...
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IPC IPC(8): H04L1/00H04L1/06H04L25/03
Inventor 庄亮葛小东
Owner ST ERICSSON SEMICON BEIJING