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Communication method for interleave division multiple access system with time frequency interleaving function

A technology of hand-division multiple access and time-frequency interleaving, which is applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of interleavers only interleaving in the frequency domain and low resource utilization, and improve the bit error rate performance Effect

Inactive Publication Date: 2010-12-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the interleaver of the traditional IDMA system only interleaves in the frequency domain and the resource utilization rate is low, and proposes a communication method of an interleaving division multiple access system with time-frequency interleaving

Method used

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  • Communication method for interleave division multiple access system with time frequency interleaving function
  • Communication method for interleave division multiple access system with time frequency interleaving function
  • Communication method for interleave division multiple access system with time frequency interleaving function

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Embodiment Construction

[0022] Specific embodiments of the present invention will be given below in conjunction with the accompanying drawings. It should be noted that the parameters in the examples do not affect the generality of the present invention.

[0023] Before setting forth specific embodiments, at first introduce the terms used wherein:

[0024] 1) Spread spectrum means that the signal is copied to different frequency bands.

[0025] 2) Interleaving means that the signals in one frame are disturbed and reordered.

[0026] 3) The interleaver is a device for interleaving data.

[0027] 4) IFFT stands for Inverse Fast Fourier Transform.

[0028] 5) FFT stands for Fast Fourier Transform.

[0029] 6) The coherence time represents the statistical average value of the time interval during which the channel impulse response remains unchanged.

[0030] 7) Rounding means removing the decimal part of the value and retaining the value obtained by the integer part.

[0031] In order to facilitate ...

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Abstract

The invention discloses a communication method for an interleave division multiple access (IDMA) system with a time frequency interleaving function, which aims at the problems that an interleaver of the conventional IDMA system only interleaves at a frequency domain and has a low resource utilization ratio. A step of time frequency interleaving (14) is added after the step of frequency domain interleaving (3) during transmission; and correspondingly, a step of time frequency deinterleaving (15) is added after the step of FFT (11) during reception. By processing data matrix in the step of timefrequency interleaving (14) and the step of time frequency deinterleaving (15), the time domain resource is effectively utilized and the bit error rate of the IDMA system is obviously improved on thepremise of not increasing the operating complexity.

Description

technical field [0001] The invention belongs to the technical field of hand-division multiple access system communication, in particular to an interleaver of the hand-division multiple access system. Background technique [0002] The Interleave Division Multiple Access (IDMA, Interleave Division Multiple Access) system is evolved from the Code Division Multiple Access (CDMA, Code Division Multiple Access) system, and its working principle is as follows: figure 1 As shown: the source data is mapped 1 and spread 2 during the transmission process, interleaved with mutually orthogonal interleavers in the 3 steps of frequency domain interleaving, and then through IFFT 4, inserting cyclic prefix 5, D / A conversion 6, Up-conversion 7 is sent out, and the signal at the receiving end undergoes down-conversion 8, A / D conversion 9, cyclic prefix removal 10, FFT 11, traditional IDMA system detection 12, and inverse mapping 13 to restore the source data during the receiving process. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 何旭任文君肖悦李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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