Field programmable gate array (FPGA) based method for achieving synchronous detection of oversampling Golay sequence

Abstract

The invention relates to a field programmable gate array (FPGA) based method for achieving synchronous detection of an oversampling Golay sequence. A hardware system established on the basis of FPGA comprises a Golay sequence detector module, a parameter read control module, a system control module, a related judgement and locking module, a time delay module and a sequence extraction module, the Golay sequence is used as a synchronous sequence, the possibility of false synchronization and false loss of synchronism can be reduced, a detecting module uses a special not exclusive or algorithm, 50% of shifting registers occupied by a slippage correlation operation can be freed, by means of the parameter read control module, multiplexing of correlation operation of the Golay sequence with various lengths and parameters is achieved, similarly, FPGA on-chip resources occupied by a synchronizing system are reduced, the sequence detection operation interval can be flexibly adjusted by the system according to different oversampling ratios, and the synchronous detection supporting 1 to 16 times oversampling is achieved.

Description

technical field [0001] The invention relates to equipment in the communication field, in particular to a method for realizing synchronous detection of an oversampled Golay sequence based on FPGA. Background technique [0002] Oversampling technology is commonly used in modern digital signal processing, and oversampling is to use a frequency much larger than the Nyquist sampling frequency to sample the input signal. Oversampling is to change the distribution of noise and reduce the noise within the bandwidth of the useful signal. [0003] Oversampling can improve time-domain resolution to obtain better time-domain waveforms; can improve filter processing gain, and when filtering in the frequency domain, filter design becomes easier; can improve signal-to-noise ratio, and match filtering can Better collection of wave energy. [0004] Golay sequence was first discovered by Golay, it is a complementary binary code sequence with many useful properties. One of...

AI Technical Summary

Problems solved by technology

[0005] The Golay sequence value is composed of +1 and -1, so each shift register uses at least 2 bits to store the input data, and the length of the Gray sequence is N, so the implementation of the detector uses at least 2N shift registers and N multipliers To store and perform sliding correlation, it takes up quite a lot of resources for the FPGA, and greatly reduces the processing speed of the system

Images