Arbitrary code rate universal MPSK demodulation system and demodulation method thereof

Abstract

The invention provides a general MPSK demodulation system for any code rate and a demodulation method thereof. The general MPSK demodulation system comprises an orthogonal down-conversion module, a first variable time length integrator module, a second variable time length integrator module, a complex multiplier module, a CORDIC phase discrimination module, a demodulation module, a PI controller module, a numerical control oscillator module, a symbol synchronization module and a phase adjustment module. The arbitrary code rate universal MPSK demodulation system and the demodulation method thereof have the advantages that the arbitrary code rate can be adjusted, the modulation mode of any MPSK can be compatible, the excellent performance of a demodulator is guaranteed through a variable time length integrator and a cordic phase discrimination algorithm, and the demodulation method is low in hardware resource consumption and 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 universal MPSK demodulation system with an 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 a constant envelope modulation and has low linearity requirements for the transmitting power amplifier. 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, but the main lobe width of the power spectrum of QPSK is h...

AI Technical Summary

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

Images