Block compressive sensing non-orthogonal multiple-address system multiuser detection method

A technology for non-orthogonal multiple access and multi-user detection, applied in the field of multi-user detection for block compressed sensing non-orthogonal multiple access systems

A technology for non-orthogonal multiple access and multi-user detection, applied in the field of multi-user detection for block compressed sensing non-orthogonal multiple access systems

CN107248902AActive Publication Date: 2017-10-13UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Block compressive sensing non-orthogonal multiple-address system multiuser detection method
  • Block compressive sensing non-orthogonal multiple-address system multiuser detection method
  • Block compressive sensing non-orthogonal multiple-address system multiuser detection method

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[0031] The technical solution of the present invention will be described in detail below with reference to the drawings and embodiments.

[0032] According to the transmission conditions and the procedures of the detection process, initialize the following parameters:

[0033] The total number of potential users for communication is K=200, the length of the spreading sequence is N=100, the spreading sequence uses Gaussian pseudo-random sequence, and the system overload rate User activity is τ=20, and the number of consecutive time slots in a frame is J=7. Active users maintain communication with the base station in one frame, while inactive users remain silent in these 7 time slots, and the signal-to-noise ratio is within 0dB, ​​2dB, 4dB, 6dB, 8dB corresponding threshold P th It is 0.68, 0.51, 0.48, 0.38 and 0.28. The modulation mode of the system is QPSK modulation, and the channel model is Pingdan Rayleigh fading channel; in a single time slot, the information bits transmitted b...

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Abstract

The invention belongs to the wireless communication signal detection technical field and relates to a block compressive sensing non-orthogonal multiple-address system multiuser detection method. The invention provides a sparseness adaptive detection method which can recombine structured sparseness into block sparseness. According to the block compressive sensing non-orthogonal multiple-address system multiuser detection method of the invention, a block sparseness-adaptive sub-space tracking algorithm is adopted for recombined block sparseness signals; according to the algorithm, a noise power setting threshold is utilized to realize the adaptive evaluation of the sparseness of users, and SER (Symbol Error Rate) performance is improved greatly compared with that of the prior art under a condition that the a priori information of sparseness degree is not required; and a simulation result indicates that the performance of the algorithm can reach an optimal theoretical value after a signal-to-noise ratio is increased to a certain extent.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication signal detection, and relates to a block compressed sensing non-orthogonal multiple access system multi-user detection method. Background technique [0002] Large-scale machine communication is one of the core application scenarios of 5G in the future. It has the characteristics of small packet transmission, massive connections, low latency access, and low power consumption. The existing multiple access technology has been difficult to meet the requirements of large-scale machine communication, mass connection and high scalability, non-orthogonal multiple access technology is considered to be a more suitable solution; at the same time, the uplink of large-scale machine communication is common There is a characteristic of sporadic communication, that is, the number of users accessing the base station at a certain moment is much smaller than the total number of users. Due to the character...

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Application Information

Patent Timeline
13 Oct 2017
Publication
CN107248902A
IPC
H04L1/00
CPC
H04L1/0048; H04L1/005; H04L1/0051
Inventors
董彬虹; 成聪