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Multi-user iteration soft detection device and method based on optimal Bayesian

A multi-user, soft detection technology, applied in the direction of forward error control, line-of-sight transmission, digital transmission system, etc., can solve the problems of limiting system performance and application, high complexity of system implementation, multi-access interference, etc.

Inactive Publication Date: 2017-03-15
FUDAN UNIV
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Problems solved by technology

OCDMA uses optical orthogonal codes to distinguish users and realize multiple access, but the system implementation complexity is high, and the interference of multiple access is serious, which seriously limits the system performance and application

Method used

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  • Multi-user iteration soft detection device and method based on optimal Bayesian
  • Multi-user iteration soft detection device and method based on optimal Bayesian
  • Multi-user iteration soft detection device and method based on optimal Bayesian

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Embodiment Construction

[0056] The method for multi-user iterative soft detection based on optimal Bayesian that the present invention proposes, concrete steps are as follows:

[0057] Such as figure 1 As shown, there are K users at the transmitter, and the channel is modeled by a Laguerre photon counting channel. The system uses Q-ary PPM coded IDMA free-space laser communication receiver for Monte Carlo simulation to compare the performance of the system under different levels of atmospheric turbulence channel conditions, and simulate the performance of the system under different numbers of users.

[0058] Figure 4 The bit error rate and the number of algorithm iterations of the multi-user free-space laser communication system under different modulation orders are given. From the figure, it can be analyzed that the bit error rate of the higher-order PPM modulation system is lower, the system performance is more reliable, and The BER of the multi-user system based on the optimal Bayesian algorith...

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Abstract

The invention belongs to the technical field of wireless communication, and in particular a multi-user iteration soft detection device and method based on the optimal Bayesian. A free space laser communication transmission and receiving system mode based on the IDMA is adopted by the method, a signal is transmitted after being encoded by a forward encoder and interleaved and modulated by an interleaver at a transmitter, and then prior information of the received signal is updated by use of the optimal Bayesian multi-user soft detection algorithm through the ESE and DEC decoder in a receiver; the multi-user interference is reduced, and the iteration soft demodulation of the signal is realized. The device disclosed by the invention comprises two parts: the free space laser communication transmitter and the free space laser communication receiver based on the IDMA. The device has good inhibition effect to the multi-user interference, and can resist the impact from the atmosphere turbulence to some extent, and can be extensively applied to the high speed data transmission scene in the networking of the Internet of Things.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a device and method for multi-user iterative soft detection based on optimal Bayesian. Background technique [0002] Free space optical communication, also known as wireless optical communication, uses invisible laser as a carrier to realize point-to-point, point-to-multipoint or multipoint-to-multipoint two-way communication technology in the atmosphere or vacuum channel. The frequency of the light wave in the terahertz spectral range. Free space optical communication is the product of the combination of optical fiber communication and radio frequency communication. It has the characteristics of both radio frequency communication and optical fiber communication. Compared with radio frequency communication, free space optical communication does not require frequency license and expensive usage fees. High transmission rate, good laser orientation, inher...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B10/112
CPCH04B10/1123H04L1/0048H04L1/0071
Inventor 辜开丽魏陈佳杨宁赵晓周小林
Owner FUDAN UNIV
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