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Multi-user multi-access communication transmitting and receiving method based on weighted-type fractional Fourier transform

A fractional Fourier, multiple access communication technology, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve the problems of transmit signal fading, system bit error rate, etc., to improve bit error performance and reduce serious fading. the effect of

Inactive Publication Date: 2017-07-14
HARBIN INST OF TECH +1
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Problems solved by technology

[0003] At present, during the transmission process of the multi-user multiple access system, the transmitted signal will be affected by local fading, resulting in a high bit error rate of the system

Method used

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  • Multi-user multi-access communication transmitting and receiving method based on weighted-type fractional Fourier transform
  • Multi-user multi-access communication transmitting and receiving method based on weighted-type fractional Fourier transform
  • Multi-user multi-access communication transmitting and receiving method based on weighted-type fractional Fourier transform

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specific Embodiment approach 1

[0024] Specific implementation mode 1. Combination figure 1 , Figure 3 to Figure 6 Illustrate this specific embodiment, based on weighted fractional Fourier transform multi-user multiple access communication transmission method, it comprises the following steps:

[0025] Step 1. According to the TDMA multiple access method, the user performs the zero padding operation on the corresponding position of the signal to be transmitted after baseband modulation according to the time slot allocated by the system, and obtains the spreading sequence of each user. Taking user 1 as an example, the original signal is set as f 1 (x), the signal is f after zero padding 1 0 (x), such as figure 1 shown;

[0026] Step 2, each user sends the signal sequence obtained separately to the WFRFT synthesis module, such as image 3 shown. The module includes a DFT module, a No. 1 inversion module, a No. 2 inversion module and a coefficient generation module. The transformed four-way signal compo...

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Abstract

The invention discloses a multi-user multi-access communication transmitting and receiving method based on weighted-type fractional Fourier transform and relates to the field of communication. According to the methods, resource sharing among multiple users is realized, and moreover, an influence of partial fading is guaranteed to be reduced in a transmission process of each user transmitting signal. According to the methods, a TDMA (Time Division Multiple Access) mode is employed, and weighted-type fractional Fourier transform synthesis modules are introduced at transmitting ends of the multiple users. Weighted-type fractional Fourier transform is carried out on signals to generate four signals, thereby obtaining two time domain signals and two frequency domain signals. Mathematical constraint relationships exist among the signals. When certain signal fades seriously, the signal information can be recovered through other branch signal components. A time delay adjustment module is introduced before the system transmits the signals. Time delay adjustment is carried out on two generated signal components. The two signal components are guaranteed to be received by a receiving end at the same time. Parameters for controlling the time delay adjustment are fed back to the transmitting end by the receiving end. The methods are applicable to a signal transmitting occasion.

Description

technical field [0001] The present invention relates to the field of communication. Background technique [0002] Time Division Multiple Access (TDMA) has been widely used in wireless communication systems. In this multiple access method, the transmission time is periodically divided into non-overlapping time slots, and the width of each time slot can be different, and multiple users send signals to the base station by inserting user data information in different time slots. When the timing and synchronization conditions are met, the base station can receive signals from multiple user terminals in each time slot without interference. [0003] At present, during the transmission process of the multi-user multiple access system, the transmission signal will be affected by local fading, resulting in a high bit error rate of the system. Contents of the invention [0004] The purpose of the present invention is to receive the transmission signal from each user at the receivin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/263
Inventor 沙学军李婧梅林马聪李勇
Owner HARBIN INST OF TECH
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