Signal detection method based on compressed sensing in generalized RASK system

A technology of compressed sensing and signal detection, applied in baseband system components, shaping network in transmitter/receiver, receiver monitoring, etc., can solve problems such as increased complexity, difficult application, unsatisfactory, etc., to achieve detection The effects of performance improvement, strong flexibility, and high noise immunity

Pending Publication Date: 2022-04-15
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Although the optimal detection performance can be achieved, the complexity increases exponentially with the number of active antennas, because it is difficult to apply to practical engineering
Traditional linear detection algorithms such as minimum mean square error (Minimum Mean Squared Error, MMSE) detection algorithms are not ideal and are only suitable for overdetermined systems

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  • Signal detection method based on compressed sensing in generalized RASK system
  • Signal detection method based on compressed sensing in generalized RASK system
  • Signal detection method based on compressed sensing in generalized RASK system

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Embodiment Construction

[0020] 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 making creative efforts belong to the protection scope of the present invention.

[0021] figure 1 It is a system block diagram of the generalized RASK system of the present invention, such as figure 1 As shown, time inversion is introduced at the transmitting end for preprocessing to form a spatial beam, so that the transmitted signal can be focused to the target receiving antenna, which can reduce energy leakage. The time-reversal technology first transmits the detection pulse at the receiving end, and the sending end receives and extract...

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Abstract

The invention relates to the technical field of wireless communication, in particular to a signal detection method based on compressed sensing in a generalized RASK system. The method comprises the following steps that: in a generalized RASK system, signals have sparsity, so that the compressed sensing reconstruction algorithm is used for recovering the signals; the method comprises the following steps: firstly, calculating an inner product of a residual error of a current iteration process and each column of a channel matrix, taking an absolute value, comparing the absolute value with an adaptive threshold value, selecting a column vector of the channel matrix greater than the adaptive threshold value, and storing a corresponding column subscript into an incremental activation antenna index set; forming an initial support set; estimating a signal by solving a least square problem; then, some proper antenna indexes are flexibly selected from the estimated signals, wrong indexes and some redundant items are removed, the signal search space is reduced, and meanwhile, the residual error is updated; according to the method, the reconstruction precision can be improved through secondary screening, and the complexity is not high while the good reconstruction performance is achieved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a signal detection method based on compressed sensing in a generalized RASK system. Background technique [0002] Multiple Input Multiple Output (Multiple Input Multiple Output, MIMO) system compared to single input single [0003] Output (Single Input Single Output, SISO), data transmission rate and link reliability have been significantly improved. However, while MIMO technology brings performance gains to the communication system, it also has some defects, such as strict Inter Antenna Synchronization (Inter Antenna Synchronization, IAS) and Inter Channel Interference (Inter Channel Interference, ICI), etc. The problem has become the biggest obstacle hindering the further development of MIMO technology. [0004] In spatial modulation (Spatial Modulation, SM), the transmitter only activates one antenna for data transmission in each transmission time slot, and th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/20H04L25/02H04L25/03
Inventor 李方伟万俊良王明月
Owner CHONGQING UNIV OF POSTS & TELECOMM
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