QR decomposition detection method

Abstract

The invention belongs to the technical field of mobile communication, and particularly relates to a QR decomposition detection method under a novel system combined with spatial modulation and quasi-orthogonal space time block codes. The QR decomposition detection method comprises the steps that first, antenna combined modes are selected and traversed, and an equivalent channel submatrix corresponding to an activated antenna combined index is obtained; QR decomposition is conducted on the equivalent channel sub matrix, so that an upper triangular matrix R is obtained; afterwards, the last sign is demodulated, judgment is made by using a maximum-likelihood criterion, and when other signs are detected, interference of the detected signs is sequentially subtracted. Due to the fact that each antenna combined mode corresponds to a set of solution vectors, the Euclidean distance between received signals is calculated respectively, the solution vector corresponding to the minimum value serves as an optimal detection sending signal, the corresponding sending combination is an activated sending antenna combination. Through QR decomposition, the searching frequency can be reduced, the detection complexity of a receiver is lowered, and excellent detection performance can be achieved under the low complexity condition.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a QR decomposition detection method under a new system combining space modulation and quasi-orthogonal space-time block code. Background technique [0002] Spatial Modulation (SM) technology divides a certain number of information bits into two parts, one part is used to select the transmit antenna to be activated, the other part is used to modulate and map into constellation symbols, and the mapped constellation symbols are selected by The selected transmit antenna transmits, and the unselected transmit antenna is silent. Using the SM technology can avoid the problems of inter-channel interference and transmitting antenna synchronization existing in a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) system. The SM system only activates one transmitting antenna at a time, while the other antennas are silent. Space Time Block Code (S...

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Problems solved by technology

The Orthogonal Space Time Block Code (OSTBC) proposed by Alamouti et al. can obtain the greatest diversity gain, but other forms of orthogonal coding cannot be transmitted at full rate, resulting in backlog, cannot achieve high-speed transmission

Jafarkhani et al. proposed the concept of quasi-orthogonal space-time block code (Quasi-Orthogonal Space Time Block Code, QOSTBC), which can achieve full-rate transmission, but due to quasi-orthogonality, only part of the diversity gain can be obtained

Maximum likelihood (Maximum Likelihood, ML) detection has the best detection performance, but the complexity increases exponentially with the number of transmitting antennas

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