Method for sending signal by orthogonal frequency division multiplex system and method of cell search

A technology of orthogonal frequency division and signal transmission, which is applied in the cell search field of the corresponding mobile station, can solve the problems of long cell search time, complex implementation, short cell search search time, etc., and achieve the effect of short cell search time and simple implementation

Active Publication Date: 2007-07-18
ZTE CORP
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Problems solved by technology

[0007] In order to solve the problems of long time and complex implementation brought by the diversity of existing cyclic prefix lengths to cell search, the purpose of the present invention is to provide a frame processing method and a cell search method for an OFDM system transmitting terminal, Make cell search simple and search time short

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  • Method for sending signal by orthogonal frequency division multiplex system and method of cell search

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Embodiment Construction

[0022] In the OFDM system, a frame is divided into several subframes, and the length of a subframe is a predetermined value. Due to different application scenarios, the system selects a cyclic prefix length for each subframe from various cyclic prefix lengths.

[0023] Figure 1 is a schematic diagram of an OFDM symbol, and the part filled with left oblique lines in the rectangular box in Figure 1 is the cyclic prefix of the OFDM symbol. The part that is not filled in the rectangular box is the useful symbol part of the OFDM symbol, and the cyclic prefix part is usually the repetition of a piece of data behind the useful symbol part. At the receiver side, when the receiver demodulates the OFDM signal, the content of the cyclic prefix part is usually discarded by the receiver. Therefore, before demodulation, the receiver must obtain the position of the useful symbol part of the OFDM symbol in advance.

[0024] Due to different application scenarios, the system selects a cyclic p...

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Abstract

This invention discloses a method for transmitting signal by an emission end of an OFDM system and a search method of local areas by mobile terminals, in which, the emission end transmits local area ID signal on a last OFDM symbol of the sub-frame and the mobile station realizes the area search by synchronization of sub-frames, area identification and synchronization of OFDM, which sets local area ID signals on the last OFDM symbol and transmits it, and sends the system information at the position closing to the pilot symbol on the sub-frame with fixed circular prefix, so that, mobile terminals can finish the search without testing circular prefix.

Description

technical field [0001] The present invention relates to the field of digital communication, in particular to a method for transmitting signals at a transmitting end based on Orthogonal Frequency Division Multiplex (OFDM) technology, and a corresponding cell search method at a mobile station. Background technique [0002] As a multi-carrier transmission mode, OFDM converts a high-speed transmission data stream into a set of low-speed parallel transmission data streams, which greatly reduces the sensitivity of the system to the frequency selectivity of multipath fading channels. The introduction of the cyclic prefix further enhances the ability of the system to resist Inter-symbol Interference (ISI). In addition, the high bandwidth utilization rate and simple implementation make OFDM more and more widely used in the wireless communication field. , For example, WLAN system, WiMax system based on Orthogonal Frequency Division Multiple Access, etc. are all systems based on OFDM t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/26
Inventor 夏树强左志松
Owner ZTE CORP
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