COM-1827SOFT SOQPSK modem, VHDL source/IP core



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The COM-1827SOFT_SOQPSK_MODEM is a coherent modem for SOQPSK continuous phase modulation with flexible programmable features
  • SOQPSK is a spectrum-efficient constant envelope modulation well suited for operation through power amplifiers near saturation
  • Programmable symbol rate up to fclk/4, where fclk is the processing clock frequency
  • Excellent BER performance using trellis decoding (SOVA) 4-bit soft-decision demodulator output for best FEC decoder performance
  • Near theoretical BER vs Eb/No
  • ±50ppm symbol timing tracking
  • Carrier frequency acquisition: ±10% of symbol rate at the threshold
  • Acquisition threshold < 2dB Eb/No
  • Ancillary functions: BER tester, Matlab code for generating sampled stimulus waveforms
  • Tested on Xilinx 7-series FPGA, but portable to other FPGA types
The entire VHDL source code is deliverable.
Unlimited license to make and use. See the complete licensing terms at

This product was added to our catalog on Tuesday 19 January, 2021.

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