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Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm

A technology of interference cancellation and implementation method, which is applied in the direction of electrical components, digital transmission systems, and error prevention, and can solve the problems of reducing the communication efficiency of spread spectrum radio stations and increasing system delay, so as to improve user capacity and frequency band utilization, reduce System delay, reduce the effect of settling time

Inactive Publication Date: 2012-09-19
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

This reduces the communication efficiency of the spread spectrum radio and increases the system delay

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  • Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm
  • Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm
  • Method for realizing multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm

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Embodiment Construction

[0033] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0034] The present invention is mainly divided into two parts: a transmitter and a receiver. The transmitter mainly completes the functions of encoding, spreading and modulating transmission of user data. The block diagram of the transmitter system is as follows: Figure 1(a) shown. The receiver needs to complete simultaneous and accurate reception of multiple transmitted signals in the same frequency band at the same time. After the analog signal processing, the digital part needs to perform corresponding synchronous despreading, interference removal and synchronous despreading on the received multi-channel superimposed signals. To achieve the separation and decoding of multi-channel signals. Receiver system block diagram as Figure 1(b) shown.

[0035] The software implementation of the system can be flexibly configured according to the working state...

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Abstract

The invention provides a method for realizing a multi-user spread spectrum broadcasting station based on parallel interference cancellation algorithm, which can realize data transmission between a plurality of users and a receiver at the same time under the same frequency. The parallel interference cancellation algorithm is realized on a receiver; and before the algorithm is realized, a code synchronization module of the receiver outputs a spreading code of the current phase position, and a despreading module outputs a primary despreading signal. The parallel interference cancellation algorithm comprises the following steps: firstly, a spreading code is utilized to despread the primary despreading signal for the second time and the cross correlation coefficients of different user spreading codes are worked out at the same time; secondly, all secondary spread spectrum signals that interfere with users are multiplied and added with the corresponding cross correlation coefficients respectively to obtain interference signals; thirdly, the interference signals are subtracted from baseband digital signals to obtain baseband signals without interference; and finally, code synchronization, despreading and carrier synchronization demodulation are performed to the baseband signals without interference so as to obtain the current user data. According to the invention, the processes are carried out concurrently, so that radio station communication and data transmission between a plurality of users and the receiver can be realized in the same frequency band at the same time.

Description

technical field [0001] The invention relates to a multi-user spread-spectrum radio implementation method based on a parallel interference cancellation algorithm, which belongs to the technical field of wireless communication and relates to the research of wireless spread-spectrum communication technology, multi-user detection technology, and same-frequency multi-phase carrier synchronization technology. Background technique [0002] Spread spectrum technology can effectively improve the anti-jamming and confidentiality performance of communication systems through spectrum broadening processing, so it has been developed rapidly and is widely used in military fields such as military communications and electronic countermeasures. At the same time, it has also been valued and applied in the field of civilian communications. [0003] Existing wireless spread spectrum stations mainly adopt the point-to-point communication mode, and mostly adopt the polling method when realizing mul...

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Application Information

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IPC IPC(8): H04B1/7097H04B1/7087H04L1/00
Inventor 何苏勤苏军龙乐磊王昊王小庆白天石
Owner BEIJING UNIV OF CHEM TECH
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