A Demodulation Code Rate Detection Method Based on Differential Correlation Operation
A detection method and code rate technology, which is applied in data rate detection devices, error prevention, multi-frequency code systems, etc., can solve the problems of large demodulation code rate detection error, rate ambiguity, etc., and achieve good versatility and good detection performance , the effect of improving the detection accuracy
Active Publication Date: 2020-11-20
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
[0005] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a demodulation code rate detection method based on differential correlation operation, and to solve the rate ambiguity caused by the multiple relationship between the code rate files existing in the prior art , which leads to the problem that the detection error of the demodulation code rate is large
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[0045] Let's take the implementation process of the first 65 symbol differential correlation as an example, such as image 3 and Figure 4 As shown, the brief implementation steps are as follows:
[0046] Step 1: Store the matched filter output sample point data into the cache module using RAM. The starting storage address of RAM starts from zero. When the data cache size in RAM is greater than M*4, set it to 260 here, start to output RAM The sample point data in the output data address starts from zero. Under each clock trigger, the address is increased by 1. If the I stored in the RAM for the nth time is read at this timen |Q n sample point data, and also need to read the n-1th stored I in RAM n-1 |Q n-1 Sample point data, the sample point data read out for the n-1th time is output as the sample point data of the previous symbol, and the sample point data read out for the nth time is output as the sample point data of the current symbol
[0047] Step 2: the I of the curr...
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The invention discloses a demodulation code rate detection method based on differential correlation operation, and belongs to the technical field of multi-code rate adaptive demodulation. The method comprises the following steps of (1) respectively storing base band sample point data into different data cache regions according to code rates corresponding to the base band sample point data, whereinthe different data cache regions correspond to one code rate identification respectively, and the code rates are smaller than the sampling frequency of the sample point data; (2) extracting sample point data with the data size larger than or equal to a preset threshold from different data cache regions; (3) extracting sample point data from the sample point data with the data size larger than orequal to the preset threshold according to different code element phase relations, and generating sample point data sequences corresponding to different code element phase relations; (4) carrying outdifferential operation on the different sample point data sequences respectively, and carrying out correlation operation on the sample point data sequences subjected to differential operation and thecorresponding sample point data sequences; and (5) determining a demodulation code rate according to a correlation operation result.
Description
technical field [0001] The invention belongs to the technical field of multi-code rate self-adaptive demodulation, and relates to a demodulation code rate detection method based on differential correlation operation. Background technique [0002] With the development of satellite communication technology, the satellite communication system is developing in the direction of supporting multi-users, multi-services, multi-rate files, on-board adaptive and flexible processing, etc. The traditional single code rate communication system can no longer meet the development needs of satellite communication. Multi-rate adaptive modulation and demodulation communication system is well adapted to this development trend. [0003] In the adaptive modulation and demodulation communication system, the ground station will adjust the uplink transmission code rate in real time according to different channel environments. When the channel environment is relatively good, it will send high code ra...
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IPC IPC(8): H04L1/00H04L7/04H04L25/02H04L27/26
CPCH04L1/0046H04L7/042H04L25/0262H04L27/2649H04L27/2655
Inventor 王战强惠腾飞王大庆张剑田嘉王欣
Owner XIAN INSTITUE OF SPACE RADIO TECH