Synchronous method for wideband time division duplex cellular system

Abstract

The invention relates to a synchronizing system for a wideband time division diplex cellular system whose data time gap adopts OFDM modulating mode, comprising: (1) a base station transmits downlink pilot sequence in downlink pilot time gap in single carrier wave form; (2) a terminal detects the downlink pilot sequence by searching and receiving the downlink pilot time gap and establishes a receiving synchronization relation with a village; (3) when the terminal needs to connect to the system, it uses the obtained receiving synchronization relation to transmit uplink pilot sequence in uplink pilot time gap. And the invention reduces various interference problems caused by multi-village networking and uplink and downlink switching point by setting downlink pilot time gap into single carrier wave working mode on fixed bandwidth and transmitting pilot signals at frame intervals, and simplifies primary village searching algorithm of the terminal and the implementing method, able to improve terminal access performance.

Description

technical field [0001] The invention relates to a broadband time-division duplex cellular mobile communication system, in particular to a method for synchronizing uplink and downlink of the broadband time-division duplex cellular system using OFDM modulation. Background technique [0002] TD-SCDMA is the only standard among the three major international standards of the third generation mobile communication system that adopts time division duplex (TDD) and uplink synchronization technology. It can work on a single frequency bandwidth of 1.6MHz, does not require paired uplink and downlink frequency configurations, has flexible uplink and downlink time slot conversion points to support the transmission of uplink and downlink asymmetric services, and has greater flexibility in spectrum utilization. This standard is very suitable for system design using advanced technologies in wireless communication such as smart antenna, joint detection and software radio, so that the system h...

AI Technical Summary

Problems solved by technology

However, the design of the synchronization system in the existing broadband wireless local area network cannot meet the requirements of the multi-cell work of the time-division duplex cellular system, and it is difficult to effectively and quickly perform cell search and establish synchronization of the uplink and downlink in the case of multi-cell work.

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