Digital Video Transmission System with Pilot Aided C-OFDM (1995)
By Yasuo Harada, Hiroshi Hayashino, Yasuhiro Uno, Tomohiro Kimura, Hitoshi Mori, Manager of Information & Communications Technology Laboratory, Matsushita Electric Industrial Co. Ltd.
A digital video transmission system is proposed that uses a pilot-aided Coded Orthogonal Frequency Division Multiplexing (COFDM) scheme with multiple carriers which are individually modulated using QAM. Multiple MPEG video channels are supported within a 6MHz band. OFDM is known for its multipath mitigation effect. The technique is described from an implementation point of view, addressing such issues as equalization of channel characteristics, AFC, AGC and timing synchronization, which are critical for realizing the system. Trellis decoding is also discussed with respect to equalizing the channel characteristics, which improves the bit error rate performance. The performance of the system are shown by the computer simulation.
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