A pilot capture method and device based on splitting pattern matching filter

Abstract

The present invention discloses a preamble capture method and device based on a split pattern matched filter. The device includes a local scrambling code generator, a scrambling code shift register, a scrambling code splitter, a scrambling code latch register composed of multiple sets of registers, Scrambling code multiplexer, receiving data shift register, matched filter, coherent accumulator, fast Hadamard transform module, square sum module, non-coherent accumulator, noise estimator, threshold setting module, threshold comparator; the local After the scrambling code generator, the scrambling code shift register, the scrambling code splitter, the scrambling code latch register, and the scrambling code multiplexer are connected in sequence, they are connected to the matched filter together with the receiving data shift register; the matched filter further The coherent accumulator, fast Hadamard transform module, square sum module, non-coherent accumulator are connected to the threshold comparator in sequence; the noise estimator is connected to the threshold comparator through the threshold setting module. It can reduce resource consumption and reduce ASIC design complexity.

Description

technical field [0001] The invention relates to a mobile communication network system, in particular to a fast acquisition method and device for accessing a preamble in a random access channel in a code division multiple access (CDMA) system. Background technique [0002] Random Access Channel (RACH) is an uplink transmission channel in a code division multiple access mobile communication system. It is used to transmit control information from the mobile station, such as registering with the network after the mobile station is turned on, establishing a connection request, initializing the call, Location updates after moving from one area to another, etc. The base station realizes the synchronization with the mobile station by capturing the access preamble (Preamble) of the random access channel, and then realizes the communication with the mobile station. Therefore, establishing a random access channel is actually a basic premise for the mobile station to work. Since the m...

AI Technical Summary

Problems solved by technology

If a conventional matched filter is used to achieve descrambling, the hardware register resource consumption scale is too large; in order to meet the performance indicators required by the standard, a multi-threshold judgment method is adopted, and the threshold setting and judgment are relatively complicated; The method of secondary verification increases the amount of data processed by the hardware in a short period of time, and actually increases the resources consumed by the hardware implementation; only the coherent accumulation method is used to process the received data, and the original data between the base station and the mobile station Practical application issues such as vibration frequency deviation have not been fully considered, etc.

Existing technical solutions cannot well solve the practicality and applicability of leading capture

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