A synchronization method for new generation of wireless mobile communication system

Abstract

The invention belongs to field of communication technique, especially a synchronization method in new wireless mobile communication system which can be used in OFDM modulating system of digital broadcasting TV system, wireless mobile communication system. The invention provides a new OFDM multi-carrier communication system synchronization method whose calculating complexity, performance is perfect. The method uses superposed pseudo-random sequence which possesses perfect relativity to protection band sub carrier, and pseudo-random sequence is distributed with weak energy, and the pseudo-random sequence and local sequence generate synchronization signal on receiving end. The invention is accurate, probability of synchronization is high, and performance of system can not be affected.

Description

Technical field: [0001] The invention belongs to the technical field of communication, and in particular relates to a synchronization technology in a new-generation OFDM multi-carrier communication system. It can be applied to systems using OFDM modulation such as digital broadcasting television systems and wireless mobile communication systems. Background technique: [0002] The goal of the new generation of mobile communication is to provide higher transmission rates and higher spectrum utilization. Based on this goal, and the application of Orthogonal Frequency Division Multiplexing (OFDM) technology in the existing communication system Successfully applied, OFDM technology was selected as the core modulation and demodulation technology of the new generation of mobile communication. [0003] OFDM technology is a technology that divides a high-speed information code stream into many low-speed code streams and transmits them in parallel on a group of orthogonal sub-channel...

AI Technical Summary

Problems solved by technology

However, since the adopted PN sequence is superimposed on the information symbols, this creates interference to the information symbols

Although Liying Song, YouxiTang, Hongzhi Zhao, Shaoqian Li, etc., Optimum partial interference canceling factor pilot assistantcoherent OFDM system with partial power training sequences synchronization, The 14 th IEEE 2003international symposium on Personal, Indoor and Mobile Radio Communication Proceedings, pp: 1906-1910. A method to eliminate partial interference is proposed, but this method implies a condition: the change of the receiver structure; and the document Fredrik Tufvesson, Mike Faulkner, Peter Hoeher and Ove Edfors, OFDM time and frequency synchronization by spread spectrum pilot technique, IEEEConference, 1999. and Steinga B.A, etc, Frame synchronization using superimposed sequence, Proc. IEEE ISIT'97, ULM, Germany, 1997, pp: 489. The method of selecting different energy factors in different synchronization stages to adjust the energy of the superimposed PN sequence can indeed achieve synchronization, but it has an impact on system performance, especially in high-speed mobile environments that require fast synchronization. This method is even worse. Suitable for

In the patent 200510035894.9, a weak energy parallel Barker code frame synchronization method is proposed. This method uses a parallel Barker code with a length of 32 to reduce its energy to a very weak state, thereby generating a frame synchronization signal. This method can indeed obtain Better frame synchronization performance, but frequency synchronization cannot be obtained from this synchronization signal

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