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Multi-user detection method combining approximate message passing for interleave-division multiple access system

A multi-user detection, approximate message technology, applied in the approximate message passing frequency offset detection algorithm, the detection field based on interleaved multiple access technology, can solve the problems of high complexity, affecting system performance, poor performance, etc.

Inactive Publication Date: 2018-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

However, traditional unit signal estimators still have problems such as high complexity, poor performance, and poor ability to resist frequency offset.
[0006] Because the existence of multiple frequency offsets seriously destroys the orthogonality of subcarriers, introduces InterCarrier Interference (ICI) and cannot be eliminated by single-user detection, so the ICI suppression of OFDM-IDMA system is an important and important Challenging subject, if the influence of frequency offset cannot be eliminated at the receiving end, it will seriously affect the performance of the system

Method used

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  • Multi-user detection method combining approximate message passing for interleave-division multiple access system
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  • Multi-user detection method combining approximate message passing for interleave-division multiple access system

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Embodiment Construction

[0060] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0061] In this example, the number of subcarriers is 72, the modulation method is QPSK modulation, the number of transmitting antennas and receiving antennas are 1 and 2 respectively, and the number of users is 2. This example takes the following steps:

[0062] Step 1: Generate the initial data of the three groups of users with 1008 bits each, and perform coding, spectrum spreading, interleaving, and QPSK modulation in sequence;

[0063] Step 3: After passing through the channel, add frequency offset to the signal, pass through Gaussian white noise, and then perform frequency offset compensation and fast Fourier transform to send to the receiving end;

[0064] Step 3: At the receiving end, after combining the data on the 2 receiving antennas with the maximum ratio, perform AMP-based frequency offset detection, deinterleaving, despreading and...

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Abstract

The invention belongs to the technical field of wireless communication, and specifically relates to a multi-user detection method combining approximate message passing for an interleave-division multiple access system. As an orthogonal frequency division multiplexing based on interleave-division multiple access (OFDM-IDMA) system is affected by multiple frequency offsets caused by the Doppler shift or different accuracy of a crystal oscillator of a transceiving end, but the traditional frequency offset suppression method in an orthogonal frequency division multiplexing (OFDM) system cannot adapt to the OFDM-IDMA system, therefore a multi-frequency-offset suppression method in theOFDM-IDMA system needs to be researched. The method of the invention is to adopt an approximate message passing(AMP) frequency offset detection algorithm to suppress frequency offset on the OFDM-IDMA system. By adoption of the detection method provided by the invention, the performance of the system is restored to be very close to that in the case of no frequency offset after the frequency offset compensation detection is performed.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a detection method based on interleaving multiple access technology. The invention relates to an interleaving multiple access technology (Interleave-Division Multiple Access, IDMA) based on Orthogonal Frequency Division Multiplexing (OFDM) and an approximate message passing (Approximate Message Passing, AMP) frequency offset detection algorithm. Background technique [0002] In order to meet the rapid growth of wireless network application requirements, support massive device connections, achieve higher spectral efficiency, faster data rate and larger channel capacity, the new multiple access technology has become the next generation mobile communication system 5G network One of the hotspots of research. [0003] Among them, the multiple access technique based on Interleave Devision Multiplexing (IDM) was first proposed in 2002. The basic idea of ​​ID...

Claims

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Application Information

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IPC IPC(8): H04B1/69H04B1/7103H04L1/00H04L27/26
CPCH04B1/69H04B1/7103H04L1/004H04L1/0048H04L1/0071H04L27/2688H04L27/2698
Inventor 康洁思肖悦赵岩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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