Method of designing variable code modulation flow

Abstract

The invention provides a method of designing a variable code modulation flow. The method comprises the steps of building an SNR (Signal to Noise Ratio) threshold value library aiming at various code modulation combinations; selecting a plurality of needed code modulation combinations in the SNR threshold value library; calculating the use ratio of each code modulation combination belt, and combining the SNR threshold value of each code modulation combination to build a code modulation combination table; optimizing the code modulation combination tables; traversing dynamic chain data, determining the optimal code modulation combinations sequentially in the code modulation combination tables, and arranging the optimal code modulation combinations of all time segments to realize the variable code modulation flow. According to the method provided by the invention, the difficulty of the design engineering of the variable code modulation flow can be simplified, the design period can be shortened, and the design automation can be realized easily.

Description

technical field [0001] The invention relates to the field of communication coding and transmission, in particular to a method for designing a variable coding and modulation process. Background technique [0002] Variable coding modulation (variable coding modulation, VCM) is a method for quickly switching channel coding and modulation mapping during communication. According to the predicted channel dynamics, different coding and modulation methods are selected, so as to reduce the excessive link surplus and improve the total data throughput. In recent years, the accuracy of payload sensors has been continuously improved, such as high-resolution optical payloads, synthetic aperture radar (SAR) payloads, etc. These applications have put forward higher requirements for satellite data transmission. Because the VCM method can effectively improve the spectrum utilization rate, improve the utilization efficiency of the link, and solve the problem of satellite-to-ground data transm...

AI Technical Summary

Problems solved by technology

[0003] However, in the design of satellite data transmission system, designers need to choose different modulation and coding methods according to the actual link environment to design the MODCOD change process, which requires designers to conduct in-depth MODCOD performance analysis and research; As a result, higher requirements are put forward for designers, and the workload of designers is increased. Moreover, the research process is cumbersome and time-consuming, which seriously affects the design progress of the system.

Images