A general-purpose mpsk demodulation system and demodulation method of any code rate

Abstract

The present invention provides a universal MPSK demodulation system with any code rate and its demodulation method, including an orthogonal down-conversion module, a No. 1 variable duration integrator module, a No. 2 variable duration integrator module, a complex multiplier module, CORDIC phase detection module, demodulation module, PI controller module, digitally controlled oscillator module, symbol synchronization module and phase adjustment module. A general-purpose MPSK demodulation system with any code rate and its demodulation method described in the present invention have the excellent compatibility of adjustable code rate and compatibility with any MPSK modulation mode, and at the same time through the variable duration integrator and cordic phase discrimination The algorithm guarantees the excellent performance of the demodulator, and at the same time, the demodulation method consumes less hardware resources and is convenient for hardware implementation.

Description

technical field [0001] The invention belongs to the technical field of deep space detection, and in particular relates to a general MPSK demodulation system with arbitrary code rate and a demodulation method thereof. Background technique [0002] In the field of deep space exploration, PSK modulation is the most suitable for telemetry. This is because this modulation method has the lowest demodulation threshold and is the easiest to implement. It is constant envelope modulation and has low linearity requirements for transmitting power amplifiers. Among them, 8PSK does not have good bit error rate performance, and it is difficult to meet the high standard requirements of the system for communication quality. Under the conditions of the same information rate, signal transmission power, and noise power spectral density of BPSK and QPSK, the average error rate of BPSK and QPSK is the same. The bit rate is the same, and the main lobe width of the power spectrum of QPSK is half na...

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Problems solved by technology

Among them, 8PSK does not have good bit error rate performance, and it is difficult to meet the high standard requirements of the system for communication quality. Under the condition that the information rate, signal transmission power, and noise power spectral density of BPSK and QPSK are the same, the average error rate of BPSK and QPSK The bit rate is the same, and the main lobe width of the power spectrum of QPSK is half narrower than that of BPSK, so BPSK and QPSK are often used in telemetry applications, and 8PSK is also often used in some high-speed applications

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