Research on 256QAM with Large Instantaneous Bandwidth

As an efficient modulation technique for joint carrier amplitude and phase, Quadrature Amplitude Modulation (QAM) is a widely used modulation method in modern communications. This article designs a system of 256QAM modulation signal synthesis technology, which supports scrambling, serial data to parallel data, differential coding, channel coding, constellation mapping, shaping filtering, and digital modulation. This article also provides verification tests for the key blocks of the 256QAM algorithm, including the functional test of the scrambling block, the functional test of the shaping filter module, and the functional test of the overall modulated signal. The test results show that the designed module meets the design requirements and meets the expected indicators.