A Time-Frequency Fully Averaged Orthogonal Multiple Access Transmission Method Based on Extended Weighted Fractional Fourier Transform

A technology of fractional Fourier transform and transmission method, which is applied in the field of time-frequency fully averaged orthogonal multiple access transmission, which can solve the problems of low reliability of signal transmission in multiple access systems, poor time-frequency deep fading performance, etc., and achieve enhanced reliability , good resistance to time-frequency deep fading, to achieve the effect of anti-fading performance and transmission reliability

Active Publication Date: 2022-05-24
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing multiple access system has poor performance against time-frequency deep fading of the channel, resulting in low reliability of signal transmission in the multiple access system, and proposes a time-frequency based on extended weighted fractional Fourier transform. Frequency Fully Averaged Orthogonal Multiple Access Transmission Method

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  • A Time-Frequency Fully Averaged Orthogonal Multiple Access Transmission Method Based on Extended Weighted Fractional Fourier Transform
  • A Time-Frequency Fully Averaged Orthogonal Multiple Access Transmission Method Based on Extended Weighted Fractional Fourier Transform
  • A Time-Frequency Fully Averaged Orthogonal Multiple Access Transmission Method Based on Extended Weighted Fractional Fourier Transform

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specific Embodiment approach 1

[0043] Specific implementation mode 1. Combination figure 1 and image 3 This embodiment will be described. A time-frequency fully averaged orthogonal multiple access transmission method based on extended weighted fractional Fourier transform described in this embodiment, the working process of the method at the sending end is as follows:

[0044] Step 1: After the users in the multiple access system are numbered, the baseband data (0, 1 bit data) generated by each user source are modulated respectively (the modulation mode is the phase shift keying BPSK mode) to obtain each user. The corresponding modulation result; among them, the modulation result corresponding to the kth user is A k ,k=1,2,3,...,K, K is the total number of users;

[0045] Step 2, respectively performing symbol mapping on the modulation result corresponding to each user to obtain the symbol mapping result corresponding to each user;

[0046] The specific process of the second step is:

[0047] Modulati...

specific Embodiment approach 2

[0058] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the weighting coefficient e of the extended weighted fractional Fourier transform r for:

[0059]

[0060] Among them, L=2 N , N is a positive integer, means rounded down, μ r ∈(0,2π] is a variable parameter, and mod(N,2) means that N is divided by 2 and the remainder is taken.

[0061] Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0062] Embodiment 3: This embodiment differs from Embodiment 1 in that the weighting coefficient e of the extended weighted fractional Fourier transform r for:

[0063]

[0064] where, e 0 ∈(0, 2π] is a variable parameter, L=2w+1, w∈N, N is a positive integer.

[0065] Other steps and parameters are the same as in the first embodiment.

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Abstract

A time-frequency fully averaged orthogonal multiple access transmission method based on extended weighted fractional Fourier transform belongs to the technical field of wireless communication. The invention solves the problems of poor time-frequency deep fading performance and low transmission reliability of existing multiple access systems. The present invention proposes a new orthogonal multiple access transmission method. By performing symbol mapping and extended weighted fractional Fourier transform on each user data, a signal form with time-frequency energy averaging characteristics is formed, while retaining The quadrature advantage of the original signal. In the solution proposed by the present invention, each user can occupy all the time-frequency resources available to the system without causing mutual interference. At the same time, since the proposed multiple access system achieves a uniform distribution of signals in the time-frequency plane, it has better anti-time-frequency deep fading performance, effectively improves the bit error performance under harsh channel conditions, and enhances the transmission of the multiple access system. reliability. The present invention can be applied to the technical field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a time-frequency fully averaged orthogonal multiple access transmission method based on extended weighted fractional Fourier transform. Background technique [0002] In the field of wireless communication technology, time division multiple access, frequency division multiple access, code division multiple access, etc. are the main multiple access methods at present. Time division multiple access and frequency division multiple access have been widely used in communication systems by allocating different time or frequency resources to different users. Each user can often only occupy a part of the total spectrum or time resources for transmission, which is not conducive to combating the deep time-frequency fading of the channel; in the code division multiple access system, different users occupy the same time-frequency resources, and use different address...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04J4/00
CPCH04J11/003H04J11/0036H04J4/005
Inventor 沙学军宋鸽房宵杰李卓明
Owner HARBIN INST OF TECH
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