Sampling deviation detecting method and device

Abstract

The embodiment of the invention provides sampling deviation detecting method and device. The sampling deviation detecting method comprises the following steps of: decrambing and despreading pilot frequency symbols of a pilot frequency channel, searching the pilot frequency channel in a multi-path way according to the descrambled and despreaded relevant value, and then obtaining the relevant valueof each descrambled and despreaded path; carrying out multi-path interference elimination on the relevant value of the descrambled and despreaded path, and eliminating the interference of each auxiliary path with the front and rear chip positions of the main path by utilizing the relevant vale of each auxiliary path subjected to the multi-path interference elimination; and detecting the sampling deviation according to the relevant value of the front and rear chip positions of the main path subjected to the interference elimination to obtain the sampling deviation evaluating value. The invention can accurately detect the sampling deviation when multiple paths exist in one chip.

Description

technical field Embodiments of the present invention relate to the field of communication technologies, and in particular, to a sampling deviation detection method and device. Background technique The wireless transmission channel environment of Wideband Code Division Multiple Access (WCDMA) system can be described as a frequency selective channel, and multipath channels with different delays will cause Inter-Symbol Interference (Inter-Symbol Interference; hereinafter referred to as: ISI) and inter-symbol interference (Inter-Chip Interference; hereinafter referred to as: ICI), the WCDMA receiver is usually a Rake receiver or an equalizer receiver. As an enhanced evolution technology of WCDMA, High Speed ​​Downlink Packet Access (High Speed ​​Downlink Packet Access; hereinafter referred to as: HSDPA) provides the high-speed data rate required to realize multimedia services in the third-generation mobile communication system, greatly improving the The spectrum and code resour...

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Problems solved by technology

However, the above method of detecting sampling deviation directly uses the descrambled and despreaded multipath information to perform interference cancellation, and the descrambled and despreaded multipath information is not the real multipath information, but the multipath information interfered by ISI , using interfered multipath information for interference cancellation cannot solve the multipath interference with close intervals, for example: multipath interference within one chip, therefore, the existing methods for detecting sampling deviation cannot accurately detect the presence of Sampling deviation when multiple paths

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