OFDM modem is used to encode the digitize voice/data and transmit on 45, 70 & 140 MHz IF frequencies over multiple carriers and decode on the receiving side using OFDM methodology. It uses 64QAM/16QPSK mode modulation and demodulation techniques over the 256 carriers. Convolution encoding and Viterbi decoding is provided to ensure error free data transmission and reception. It uses USB port for data transfer. Software is developed in FPGA for modulation, demodulation & implementation of OFDM algorithms(FFT, IFFT, Channel estimation phase correction and FEC)

Features:

Micro-controller	Renesas M30245FC Micro Controller
FPGA	Lattice FPGA-LFXP2
Memory	16KBITS EEPROM
Communication Interfaces	High Speed USB Interface For Data Communication RS232 Interface to PC RS422 Interface
Other Interface	Superior voice Quality Vocoder 2 SMA Connectors for Tx & Rx IF Dual ADC at 40 MSPS Dual ADC at 65 MSPS Integrated synthesizer to Generate LO for up/down Conversion
No.of Carriers	256
Modulation/Demodulation	64QAM