Overview
The COM-1827SOFT PCM/FM DEMOD is a PCM/FM demodulator- written in generic VHDL.
The entire VHDL source code is deliverable. It is portable to a variety of FPGA targets
- PCM/FM is a constant envelope modulation well suited for operation through power amplifiers near saturation.
- Flexible programmable features:
- Symbol rate up to fclk/4, where fclk is the processing clock frequency
- Nominal modulation index h [0.5 to 0.8]
- Excellent BER performance using multisymbol detection and 4-state trellis decoding (SOVA)
- 4-bit soft-decision demodulator output for best FEC decoder performance
- Performance:
- BER < 10-5 at 9.2dB Eb/No
- ±50ppm symbol timing tracking
- AFC for carrier frequency acquisition of 10% of symbol rate
- Acquisition threshold < 2dB Eb/No
- Provided with IP core:
- VHDL source code
- Matlab .m file for generating stimulus files for VHDL simulation of the demodulator and for end-to-end BER performance analysis at various signal to noise ratios
- VHDL testbench (stimulus file input, or back-to-back modem when used in conjunction with the CPM modulator IP core)
- BER tester
Documentation
Specifications
Complete VHDL/IP Core license agreement
Related products
CPM modulator IP core
FSK/MSK/GFSK/GMSK demodulator IP core
SOQPSK modem IP core
Other demodulation IP cores
Ready-to-use digital CPM modem
Ready-to-use RF CPM modem