[특허]Timing for spread-spectrum communication across noisy media

Timing for spread-spectrum communication across noisy media 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/30
출원번호	US-0863213 (1992-04-03)
발명자 / 주소	Vander Mey Timothy J. (Ocala FL)
출원인 / 주소	Intellon Corporation (Ocala FL 02)
인용정보	피인용 횟수 : 89 인용 특허 : 0

초록 ▼

A method of transmitting and receiving data packets across a noisy communication medium, e.g., an AC power line. The data packets are transmitted using spread-spectrum chirps. A first sequence of the chirps forms a contention-resolution preamble used by transmitters to resolve conflicting contentions for access to the communication medium. The preamble is followed by a second sequence of chirps that form a start-of-packet symbol used by receivers to delineate the start of data within the packet. To simplify detection at the receiver, identical chirps are used in the preamble and the start-of-packet symbol. To enable the receiver to avoid erroneously interpreting preamble chirps as start-of-packet chirps, and thereby erroneously begin to accept packet data, chirps in the preamble are transmitted at a different pitch (i.e., different time period between inception of successive chirps) from chirps in the start-of-packet symbol.

대표청구항 ▼

A receiver for decoding a spread spectrum transmission received from a communication channel on which a plurality of transmitters simultaneously contend for access, on which the transmitters contend by transmitting a preamble containing a preamble sequence of spread spectrum chirps spaced in time at a preamble pitch, and on which a transmitter gaining access to the channel transmits a data packet containing a sequence of spread spectrum chirps spaced in time at a data pitch, said data packet beginning with a predetermined initial sequence of spread spectrum chirps spaced in time at said data pitch, said data pitch being different from said preamble pitch, said receiver comprising: first means for detecting a first chirp, and for detecting subsequent chirps occurring approximately at multiples of said data pitch following said first chirp; second means for analyzing said first and subsequent chirps, to determine whether at least a portion of said detected first and subsequent chirps match at least a portion of said predetermined initial sequence; third means, operative at least prior to successful matching of said first and subsequent chirps with said predetermined initial sequence, for detecting an out-of-synch chirp said out-of-synch chirp being a chirp that has occurred between times at which data chirps are expected based on said data pitch, and following detection of said out-of-synch chirp resetting said first and second means by using said out-of-synch chirp as said first chirp, thereby restarting the detection of chirps at said data pitch and restarting the determination of whether said detected chirps match said predetermined initial sequence; and fourth means, operative following a successful initial sequence; and fourth means, operative following a successful match, for detecting the data of said data packet.

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연합인증

Timing for spread-spectrum communication across noisy media 원문보기

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Timing for spread-spectrum communication across noisy media 원문보기

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