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High Data Rate QPSK Modulator with CCSDS Punctured FEC channel Coding for Geo-Imaging Satellite

The GISAT (Geo-Imaging Satellite) mission of ISRO (Indian Space Research Organization) is to provide state-of-the-art high resolution imaging of earth from the Geo-stationary orbit . The large amount of this imaging data is to be sent in real time on earth. Therefore, a high data rate QPSK modulator at 200 Mbps is designed. CCSDS (Consultative Committee for Space Data Systems) standard punctured FEC (Forward Error Correction) convolutional channel encoding is also used at baseband, prior to modulation to compensate the channel losses. This paper describes the design of punctured (rate 7/8) FEC dual channel encoding and QPSK modulator. The results of above HDRM (High Data Rate Modulator) hardware developed for GISAT mission are also described and compared with the theoretical and simulated results.