Lead code sending and receiving method for wideband wireless communication system

Abstract

The invention provides a method for sending out and receiving the lead code of a broadband wireless communication system. The method for sending out the lead code can send lead code symbols containing the synchronized information of the system to a terminal side by a base station side before the base station side sends out a frame control head and includes that the lead code is divided into an original lead code symbol and a strengthened lead code symbol carrying the different synchronized information of the system; the original lead code symbol and the strengthened lead code symbol are then combined to be sent out after the positions of the two lead code symbols in a wireless frame are determined. The method for receiving the lead code includes that the step of frame synchronization is first completed and the step of frequency synchronization is then completed; and then the received data is matched with the local reference information to obtain the information carried by the strengthened lead code and finally obtain the information carried by the original lead code. The method for sending out and receiving the lead code improves the detection probability of the lead code and the adaptive scope of the system to frequency deviation, therefore, the quantity of cells supported by the system is greatly increased and the time for searching the cells is shortened.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a method for sending and receiving a preamble of a broadband wireless communication system. Background technique [0002] As a multi-carrier transmission mode, Orthogonal Frequency Division Multiplex (OFDM) converts a high-speed transmission data stream into a set of low-speed parallel transmission data streams, enabling the system to select the frequency of multipath fading channels Sexual sensitivity is greatly reduced. The introduction of a cyclic prefix (Cyclic Prefix, CP for short) further enhances the ability of the system to resist Inter-symbol Interference (ISI for short). In addition, the characteristics of high bandwidth utilization and simple implementation also make OFDM more and more widely used in wireless communication domains. For example, the Wireless Local Area Network (WLAN) system, the Worldwide Interoperability for Microwave Access (Wimax) system based ...

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Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide a method for sending and receiving preambles in a broadband wireless communication system, so that the cell search is simple and the search time is short, so as to solve the problem that the design of the preambles in the prior art as mentioned above causes the cell search to take too long. The problem of long search time and small frequency offset adaptation range

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