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Method for reinforcing predecessor of broadband radio communication system

A technology of preamble and radio frame, applied in the field of preamble enhancement of broadband wireless communication system, can solve the problems of small cell addressing range, short cell search and search time, and small frequency offset adaptation range, and achieves short cell search time and number of cells. The effect of increasing and improving the range of adaptation

Inactive Publication Date: 2008-10-08
ZTE CORP
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Problems solved by technology

[0007] In order to solve the problems of long time for cell search, small frequency offset adaptation range, and small Cell addressing range caused by the existing preamble design, the purpose of the present invention is to provide a preamble for the existing OFDM system. The code enhancement method makes the cell search simple and the search time is short

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  • Method for reinforcing predecessor of broadband radio communication system
  • Method for reinforcing predecessor of broadband radio communication system
  • Method for reinforcing predecessor of broadband radio communication system

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Embodiment Construction

[0028] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0029] The invention provides a method for enhancing the preamble of the existing Orthogonal Frequency Division Multiplexing system. For this purpose, a new preamble symbol is added to each wireless frame of the original system.

[0030] In the method for enhancing the preamble of the OFDM system described above, the new preamble symbol is sent at a position close to the original preamble symbol in the radio frame.

[0031] In the above method for enhancing the preamble of the OFDM system, the transmission diversity mode of the new preamble symbol is the same as that of the original preamble symbol.

[0032] In the above method for enhancing the preamble of the OFDM system, the new preamble symbols transmit the information of the Cell ID group of the cell, and it is assumed that there are M groups in total.

[0033] In the above metho...

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Abstract

The present invention discloses a method for reinforcing the predecessor of the broadband wireless communication system based on the orthogonal frequency division multiplexing technique, wherein each wireless frame of original system is added with a new preamble symbol. The invention also discloses a cell searching method of the mobile terminal in an orthogonal frequency division multiplexing technique. The method comprises the steps of frame synchronizing, frequency synchronizing, extracting and recognizing the cell ID group signal, and extracting and recognizing the cell ID in-group signal. The orthogonal frequency division multiplexing system transmitting end preamble reinforcing method and a cell searching method according to the invention increases the detection probability of the preamble and the adapting range of the system to the frequency offset through arranging novel preamble at the vicinity of the original preamble and designing the preamble which has symmetric time domain and is provided with PN sequence. Through the introducing of the cell grouping information, the number of the cells supported by the system is greatly increased. The realization is simple and the cell searching time is short.

Description

technical field [0001] The present invention relates to the field of digital communication, in particular to a method for enhancing the preamble of a broadband wireless communication system based on Orthogonal Frequency Division Multiplex (OFDM) technology. 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 system's ability to resist Inter-symbol Interference (ISI). In addition, the high bandwidth utilization and simple implementation make OFDM more and more widely used in wireless communication domains. Widely, for example, WLAN system, WiMax system based on Orthogonal Frequency Division Multiple Access, and next-generation mobile communication system are all systems based on OFDM...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L12/28H04L27/38H04J11/00H04L27/26
Inventor 孙长印
Owner ZTE CORP
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