Performance of an Efficient Parallel Data Transmission System
Saltzberg, B.
Bell Telephone Lab., Holmdel, NJ;
This paper appears in: Communication Technology, IEEE Transactions on
Publication Date: December 1967
Volume: 15,
Issue: 6
On page(s): 805-811
ISSN: 0018-9332
Digital Object Identifier: 10.1109/TCOM.1967.1089674
Current Version Published: 2003-01-06
Abstract
A parallel quadrature AM data transmission system may be implemented with a number of overlapping channels, each carrying a signaling rateb, spacedb/2apart in frequency. When a large number of channels are used, the system allows transmission speeds very close to the Nyquist rate, with little sensitivity to delay and amplitude distortion of the transmission medium. The receiver requires precise phasing of the demodulating carriers and sampling times in order to keep crosstalk between channels small. In the presence of delay and amplitude distortion, better results are obtained when half cosine roll-offs are used for shaping each channel than for full cosine roll-off. This transmission scheme appears to be a promising technique for achieving good performance at high information rates over bandlimited dispersive transmission media.
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