Method and system for controlling the minimal distance between s

Details Method and system for controlling the minimal distance between s Method and system for controlling the minimal distance between s

1997-10-06

1999-08-10

Pham, Chi H.

Pulse or digital communications

Systems using alternating or pulsating current

375264, 375286, 371 48, H04L 2700

Patent

active

059370084

ABSTRACT:
The invention concerns a method of controlling the minimal distance between successive errors in digital radio transmissions when multilevel modulations are used. With such a method the errors are spaced according to the needs, with an extremely reduced use of hardware with respect to prior art techniques. The method is characterized in that, in transmission a differential delay, i.e. different from flow to flow, is applied to each parallel flow not yet modulated, and in reception a differential delay is applied to each demodulated flow in such a way that the overall delay applied to each flow, i.e. the sum of the delay applied in transmission and the delay applied in reception, is constant and equal for all the flows.

REFERENCES:
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patent: 3585586 (1971-06-01), Harmon et al.
patent: 4571735 (1986-02-01), Furse
patent: 4630286 (1986-12-01), Betts
patent: 4677626 (1987-06-01), Betts et al.
"Convolutionally Interleaved PSK and DPSK Trellis Codes for Shadowed, Fast Fading Mobile Satellite Communication Channels", by Albert Lee et al., "IEEE Transactions on Vehicular Tech", vol. 39, No. 1, Feb. 1990, pp. 37-47.
"Multilevel Signaling", Digital Telephony, by J. Bellamy, John Wiley & Sons, Inc., Second Edition, Section 4.3.9, pp. 188-189.
"Telecommunication Transmission Systems" by Robert G. Winch, McGraw-Hill, Inc., Chapter 3, Signal Processing for Digital Radio Communications, pp. 89-105.
"Multilevel Signalling, Partial Response Signal, and Duobinary Coding", The Mobile Communications Handbook by J.D. Gibson, IEEE Press, pp. 95 and 96.
Lee et al, "Convolutionally Interleaved PSK and DPSK Trellis Codes for Shadowing, Fast Fading Mobile Satellite Communications Channels", Vehicular Technology, 1988 Conference pp. 438-444.
"Convolutionally Interleaved PSK and DPSK Trellis Codes for Shadowed, Fast Fading Mibile Satellite Communication Chanels" by Albert M. Lee et al "IEEE Transactions on Vehicular Tech" vol. 39, No. 1, Feb. 1990 pp. 37-47.

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