Cell searching synchronization method base on time domain processing

A cell search and time-domain technology, which is applied in the communication between multiple stations, code division multiplexing system, electrical components, etc., can solve the problems of large amount of FFT demodulation calculation, increase interference, etc., and reduce complexity degree, the effect of simplifying the amount of calculation

Inactive Publication Date: 2008-04-23
ZTE CORP
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Problems solved by technology

The shortcoming of this document is: (i) because it has covered one deck mask in the CPICH channel of two time-division multiplexing and is used for identifying the grouping of sub-district scrambling code, can increase the interference when the data despreading of other sub-districts
In this process, the FFT demodulation brings a large amount of calculation

Method used

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  • Cell searching synchronization method base on time domain processing
  • Cell searching synchronization method base on time domain processing
  • Cell searching synchronization method base on time domain processing

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Embodiment Construction

[0024] In the sending data frame of the sending end, in each frame, in addition to the data symbol, the pilot channel 1 (CPICH1) and the pilot channel 2 (CPICH2) respectively occupy one OFDM symbol period and other data time divisions at the frame head and the frame tail. reuse.

[0025] Different cells use different scrambling codes for spreading, and the signals of the same cell use the same cell scrambling code (CSSC) and different channel orthogonal codes (CSOC) for spreading, but different time slots in each frame signal The phases of the cell scrambling codes used by the OFDM data symbols are different, and the phase difference of the cell scrambling codes of the pilot channels CPICH1 and CPICH2 is used to determine the cell scrambling code group. interfering.

[0026] Corresponding to the above frame design, the formula can be used for every two adjacent OFCDM symbols at the receiving end

[0027] s P I ...

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Abstract

This invention discloses a method for synchronizing search of local areas based on time domain process, which applies a phase difference of two TDM CPICH to identify a harass code set in a data frame sent at the transmitting end and extra masks are not needed, so it will not increase interference to other local areas and reduces complexity of related test operation to frequency domain of OFDM signals.

Description

technical field [0001] The invention relates to a method for improving cell search synchronization of a cellular mobile system based on multi-carrier CDMA modulation technology. Background technique [0002] OFDM technology is recognized as the key technology in the new generation of wireless communication systems, it can effectively resist the intersymbol interference (ISI) and multipath fading caused by multipath. CDMA improves the anti-interference ability by spreading the user data to obtain the spreading gain. The combination of the two technologies The multi-carrier CDMA technology has been valued because of its larger system capacity. [0003] In a cellular mobile system based on multi-carrier CDMA modulation, when a user starts powering on or handovers, it is necessary to perform cell search and synchronization to find the most suitable cell for communication. Literature Y.ISHII, K.HIGUCHI, and M.SAWAHASHI, "Three-Step Cell Search Algorithm Employing Synchronizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L27/26H04B7/26H04J13/02H04B1/7083H04B1/7087
Inventor 杜永生宋荣方张苏民
Owner ZTE CORP
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