Method and equipment for detecting middle guiding code sequence in TD-SCDMA system

Abstract

It is a kind of Midamble code sequence detection method and apparatus for TD-SCDMA mobile communication system. It can reach high detection probability and low missing probability under the condition of low signal-to-noise ratio and the under the environment of having frequency diffusion and time diffusion. It can also generate rejection mark and exclude a batch of wrong input incident, such as wrong code set sequence number input, wrong synchronous Information input and local oscillator has large frequency deviation, so to realize the reduction of initializing community research time in TD-SCDMA system. This invention includes the module and steps such as Midamble receives signal sample extraction, Midamble code sequence generation, slide association, delay envelope calculation, multi-frame combination, path selection, similar value calculation, maximum value detection, confidence level calculation and compare, the generation of detection rejection mark, and generation of detection Midamble code sequence number.

Description

technical field [0001] The present invention relates to a method applied to a wireless communication system, in particular to a method applied to a Time Division Synchronous Code-Division Multiple Access (TD-SCDMA) mobile communication system. A method and device for detecting a midamble (Midamble) sequence of a user terminal device in a Cell Search process. Background technique [0002] In 1946, Bell Laboratories in the United States proposed to divide the service area of ​​mobile phones into several cells, and set up a base station in each cell to form a new concept of cellular (Cellular) mobile communication in a cellular system. In 1978, this system was successfully tested in Chicago, USA, and it was officially put into commercial use in 1983. The adoption of the cellular system enables the same frequency to be used repeatedly, thereby greatly increasing the capacity of the mobile communication system and meeting the objective needs of the sudden increase of mobile comm...

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Problems solved by technology

[0019] (5) Since the work is in the initial cell search stage, many synchronization processes, such as time synchronization and frequency synchronization, are often not completed accurately, so the Midamble codeword sequence detection method should have a certain degree of robustness (Robustness), to overcome the above-mentioned disadvantages Detection performance degradation issues that may be caused by accurate synchronization issues

But wherein in the device of the second step of the relevant cell search, only the Midamble codeword sequence output with the maximum correlation value, so the aforementioned design requirements (2) and (3) cannot be well satisfied; meanwhile, due to receiving the Midamble signal part position is According to the DwPTS position detected in the first step of the cell search, the inaccuracy and fast multipath fading that may exist due to time synchronization are not considered, so the device also fails to meet the aforementioned design requirements. (4) and (5)

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