Method and system for encoding and decoding frequency shift keyi

Details Method and system for encoding and decoding frequency shift keyi Method and system for encoding and decoding frequency shift keyi

1990-08-30

1992-04-07

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 88, 332118, 329315, H04L 2710

Patent

active

051034638

ABSTRACT:
A system and method for encoding and decoding a frequency-shift keyed data signal for transmission over a non-ideal communications channel that utilizes phase-coherently combined halfwave segments of sinewaves with a finite number of different frequencies and equal amplitudes. A stream of data characters is encoded into a transmit sequence {S(n)} of positive numbers which defines an ac signal of halfwave segments of sinewaves of fixed, preselected amplitude. The ac signal encoding the stream of data characters is transmitted over the communications channel and received as a perturbed ac signal. The received signal is identified by consecutively determining the time durations between peak values or between zero crossings of each segment yielding a receive sequence {E(n)} of positive numbers. All or parts of this receive sequence are then compared with each of a set of preselected, stored sequences, each representing a stream of none, one or more data characters. The actual stream of data characters transmitted is selected as the stream producing the smallest errors, within a preselected bound, in comparing the stored stream-representing sequences to all or parts of the receiver sequence.

REFERENCES:
patent: 4003001 (1977-01-01), Jones, Jr.
patent: 4066841 (1978-01-01), Young
patent: 4516087 (1985-05-01), Bruene
patent: 4517519 (1985-05-01), Mukaiyama
patent: 4682123 (1987-07-01), Loper et al.
patent: 4700364 (1987-10-01), Miyazaki et al.

Affiliated with

Also associated with

Rating

Method and system for encoding and decoding frequency shift keyi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for encoding and decoding frequency shift keyi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for encoding and decoding frequency shift keyi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1901228