A Signal Detection Method Based on Retiming Synchronization and Interference Cancellation

Abstract

A signal detection method based on retiming synchronization and interference cancellation. The receiving end performs timing synchronization on the received signal to find the fine synchronization point; intercepts the received pilot sequence, uses the received pilot sequence to perform channel estimation, and obtains the channel estimation value , calculate the timing synchronization adjustment amount, and obtain a new synchronization point and channel estimation coefficient according to the timing synchronization adjustment amount; intercept the service data block according to the new synchronization point, and perform frequency domain analysis on the intercepted service data block according to the new channel estimation coefficient Equalization, to obtain the initial signal judgment result of each service data block; perform interference cancellation on the received data, and then perform frequency domain equalization again, to obtain the final signal judgment result. The present invention can reduce the bit error rate of the system without reducing the frequency spectrum efficiency of the system. The interference cancellation algorithm performs interference cancellation on the received signal and then equalizes it again, which can eliminate the interference between adjacent service data blocks of the received signal and improve the performance of the communication system.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a signal detection method based on retiming synchronization and interference cancellation. Background technique [0002] In today's society, the convenience of wireless communication enables a large number of advanced technologies to be used, which can be seen everywhere in daily society. In the communication system, since the signal arriving at the receiver is a composite signal of various signals passing through different paths and having time differences, the composite signal will have a delay extension relative to the original signal in the time domain. Single carrier frequency domain equalization technology is one of the air interface schemes of wireless metropolitan area network defined by IEEE 802.16 standard. The modulation symbols in the single-carrier frequency domain equalization system are sent and processed in the form of packets, and the front of each data packe...

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Problems solved by technology

[0003] However, in a communication environment such as a long delay extension channel, when the channel delay extension value is greater than the length of the cyclic prefix, the performance of the communication system is degraded, and the communication system needs to add a cyclic prefix CP that is long enough (at least the maximum delay extension of the channel) As a guard interval to isolate adjacent symbols, but this will reduce the spectral efficiency of the system

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