Design Of DPSK Modulation And Demodulation Board Base On FPGA

DPSK is the abbreviation of differential phase shift keying. It use the phase change of the carrier to transmit information, DPSK is a kind of digital modulation method. Not only overcomes the phase ambiguity problem existing in BPSK, also the spectrum utilization rate is high, has a good BER performance, which is widely used in satellite communication and modern wireless communication system.This paper use the idea of software define radio, based on FPGA and high-speed ADC platform, investigate the principle of DPSK modulation and demodulation, and the FPGA implementation in detail. Study and achieve the DPSK all digital quadrature phase modulation and the carrier synchronization, symbol synchronous and frame synchronization. Use RS code and convolutional code concatenated methods, in order to reduce the transmission error. Board can provide four PSK remote control signals and four path locking signals, and could demodulate four path PSK telemetry signals, and communicate with the PC through the PCI bus to achieve interactive data, support a variety of data frame format discrimination and support real-time modify the signal amplitude and carrier frequency and SNR. At last, introduces the function module and PCI bus communication design of the board...