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 Combined preamble detection and information method for burst-type digital communication system

Details
Inventors: Krasner, Norman Franklin;
Assignee: Spacenet, Inc. (McLean, VA)
Primary Examiner: Corrielus; Jean
Assistant Examiner:
Attorney, Agent or Firm: Volentine Francos, PLLC

Burst transmissions in a burst-type communication system include a preamble synchronization sequence which allows detection and synchronization a burst transmission while at the same time providing information to a receiver, for example, on the subsequent burst payload data. Each burst transmission includes a preamble synchronization sequence which is one of a plurality of predetermined allowed preamble sequences in the system, according to the information desired to be transmitted. The system may also use differential encoding and decoding to eliminate the effects of frequency uncertainty. In that case, the allowed preamble sequences may be such that, after differential decoding, they differ from one another only by a polarity inversion such that a single matched filter may be used to detect two preamble sequences.

DETAILED DESCRIPTION The present invention comprises a combined synchronization and information transfer method and system in a burst-type communication system.
In one burst-type communication system of the present invention having a transmitter and a receiver, a method of communicating information in a preamble synchronization sequence of a burst transmission includes selecting, at the transmitter, a selected one of a plurality of initial detection sequences, representing one or more first preamble information bits; selecting, at the transmitter, a selected one of a plurality of unique words, representing one or more second preamble information bits; transmitting, at the transmitter, said preamble synchronization sequence comprising said selected one initial detection sequence and said selected one unique word; receiving, at the receiver, said preamble synchronization sequence; detecting, at the receiver, said one initial detection sequence to produce first time synchronization information and to receive said one or more first preamble information bits; and detecting, at the receiver, said one unique word to produce second time synchronization information and to receive said one or more second preamble information bits.
In another burst-type communication system of the present invention, a receiver includes a differential detector receiving a differentially encoded synchronization sequence and providing a base synchronization sequence including a first plurality of symbols, comprising an initial detection sequence, and a second plurality of symbols, comprising a unique word; an integrator receiving the base synchronization sequence and integrating the first plurality of symbols to produce an initial detection signal; a threshold detector receiving the first plurality of symbols, detecting the initial detection, producing an initial detection strobe comprising symbol timing information, and providing a first preamble information bit; and a unique word detector receiving the base synchronization sequence, detecting the unique word, and producing a second preamble information bit



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