Generating circuit of Golay complementary code

Abstract

The invention relates to a generating circuit of a Golay complementary code, which is used for generating a Golay complementary code with length of 2, wherein i is a natural number. The invention is characterized in that: the invention comprises a memory with a data bit of M, a counter with bit of log2(2<i+1> / M) and a shift register with a data bit of M; the memory is beforehand stored with two groups of Golay code sequences with code length of 2 which are mutually Golay complementary codes; wherein, clock pins of the memory, the counter and the shift register all input clock signals with cycle as code element width, the data output end of the counter is connected with the address pin of the memory, the data output end of the memory is connected with the data input end of the shift register, the data output end of the shift register is the Golay complementary code with length of 2. The generating circuit of the Golay complementary code has the advantages that clock skew is absent, stability is good and FPGA resource is not consumed largely.

Description

technical field [0001] The invention relates to a generation circuit of Gray's complementary code, which is used to generate a code length of 2 i Gray's complementary code. Background technique [0002] Optical Time Domain Transmitter (OTDR) can determine the loss at the fiber, the location of the fiber fault point and breakpoint, and locate the measurement point, so it can also be called fiber laser radar. The distributed optical fiber Raman temperature sensor based on the principle of OTDR utilizes the temperature effect of the Raman spectrum of the optical fiber. The temperature field of each point in the space where the optical fiber is located modulates the Raman light scattering wave transmitted in the optical fiber. After demodulation, the temperature field of the space The information is displayed in real time. However, with the introduction of optical devices, the continuous increase of optical fiber transmission distance and the loss of optical fiber make the bac...

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned traditional implementation method of Gray's complementary code, when realizing longer code length (such as 64 bits), has low efficiency, complex circuit structure, sequential cascading of clocks, there is clock offset, and the stability is not good enough. Single-stage encoders with many connections need to consume more FPGA resources

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