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Frequency offset detection method under interleave-division multiple access technology combined with coordinate descent method

A coordinate descent method and interleaving multiple access technology, which can be used in multi-frequency code systems, modulated carrier systems, transmission systems, etc., and can solve problems such as inability to apply OFDM-IDMA systems.

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

[0005] Since the OFDM-IDMA system will be affected by multiple frequency offsets caused by Doppler frequency shift or different crystal oscillator precision at the transceiver end, and the traditional frequency offset suppression method in the OFDM system cannot be applied to the OFDM-IDMA system, it is necessary to Research on Multi-Frequency Offset Suppression Method in OFDM-IDMA System

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  • Frequency offset detection method under interleave-division multiple access technology combined with coordinate descent method
  • Frequency offset detection method under interleave-division multiple access technology combined with coordinate descent method
  • Frequency offset detection method under interleave-division multiple access technology combined with coordinate descent method

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0050] In this embodiment, a Matlab simulation platform is used for experiments.

[0051] The purpose of this example is achieved through the following steps:

[0052] S1, set the IDMA simulation parameters, the system parameters are as follows in this example: the number of users U=2, the number of receiving antennas B=4, the number of iterations t max =5, QPSK modulation is adopted, that is, M=4, the encoding adopts 1 / 6 turbo code, and the simulated channel is a TDL-C channel;

[0053] S2. Generate the initial data of two groups of users, perform encoding and interleaving in sequence respectively, and perform fast inverse Fourier transform after performing QPSK modulation;

[0054] S3. After passing the channel, add frequency offset to the signal, and add Gaussian white noise, and then perform fast Fourier transform and send it to the rece...

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Abstract

The invention belongs to the field of wireless communication technology, and specifically relates to a frequency offset detection method based on an interleave-division multiple access technology. Anorthogonal frequency division multiplexing-interleave-division multiple access (OFDM-IDMA) system will be affected by multiple frequency offsets caused by Doppler shift or different crystal oscillation precision of receiving and transmitting ends, and the conventional frequency offset suppression method for an orthogonal frequency division multiplexing (OFDM) system is not suitable for the OFDM-IDMA system, so a multi-frequency offset suppression method for the OFDM-IDMA system is required to be researched. The method suppresses frequency offsets by using a coordinate descent method (CDM) frequency offset detection algorithm based on the OFDM-IDMA system. After the frequency offset detection, the frequency is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a frequency offset detection method based on interleaving multiple access technology. The invention relates to an Interleave-Division Multiple Access (IDMA) technology based on Orthogonal Frequency Division Multiplexing (OFDM) and a coordinate descent (Coordinate Descent Method, CDM) frequency offset detection algorithm. Background technique [0002] The multiple access technology is the foundation of the wireless communication network, and it is also one of the signs of the upgrading of wireless communication. Multiple access technology refers to how to allocate all resources (time, frequency, and space) of the system to all users in a cell, so as to realize multiple users accessing a shared channel for simultaneous communication. In order to meet the rapid growth of wireless network application requirements, support massive device connections, achiev...

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Application Information

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IPC IPC(8): H04L1/00H04L27/26H04B17/391
CPCH04L1/004H04L1/005H04L1/0071H04L27/2628H04L27/265H04L27/2671H04L27/2697H04B17/391
Inventor 何燃燃肖悦康洁思
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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