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Performance evaluation of 1024 QAM signal transmission in cable television distribution systems by software demodulation method

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4 Author(s)
Nakamura, N. ; Telecommun. Advancement Organ. of Japan, Yokohama, Japan ; Kurakake, T. ; Ovamada, K. ; Itoh, S.

1024 QAM transmission characteristics in cable television distribution system is experimentally evaluated. 52.74 Mbps transmission in a 6 MHz cable television channel is achieved. Spectrum efficiency is 8.79 bit/s/Hz. The transmission performance on a 1024 QAM modem with high amplitude density and large capacity is demonstrated. MPEG-2 TS packets are derived by demodulation software from the IF signal received in a PC-based memory. Experimental result shows that the BER of 1024 QAM transmission without forward error correction is 10-4 at a CN ratio of 38 dB. The implementation loss is less than 2 dB. Furthermore, the distortion effect induced on a 1024 QAM in the presence of a non-linear amplifier is also discussed.

Published in:

Communication Systems, 2002. ICCS 2002. The 8th International Conference on  (Volume:1 )

Date of Conference:

25-28 Nov. 2002