Identification of start and end points of transmitted data in sp

Details Identification of start and end points of transmitted data in sp Identification of start and end points of transmitted data in sp

1995-11-28

1998-06-16

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375367, 375369, 370479, H04B 1707, H04J 1304, H04L 700

Patent

active

057683050

ABSTRACT:
A spread spectrum communication apparatus receives a preamble signal or a postamble signal as a pilot signal, and applies a correlative demodulation by using a single spread signal to the pilot signal, and a correlative output obtained after the correlative demodulation is compared to a reference value. If the correlative output is equal to or greater than the reference value, then it is recognized as a preamble or postamble signal. In accordance with a trailing edge of the preamble signal or a leading edge of the postamble signal, a start point or an end point of information transmission can be recognized, respectively, in a lower level of a communication system without using a unique word in a data stream, thereby reducing overhead of an upper level protocol and improving data transmission efficiency.

REFERENCES:
patent: 4958359 (1990-09-01), Kato
patent: 5260969 (1993-11-01), Kato et al.

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