[특허]Time division multiplexed selective call system

Time division multiplexed selective call system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/00 H04J-003/22
출원번호	US-0793230 (1991-11-08)
발명자 / 주소	Nelson Leonard E. (Boynton Beach FL) Schwendeman Robert J. (Pompano Beach FL) DeLuca Michael J. (Boca Raton FL) Willard David F. (Popano Beach FL) Sandvos Jerry L. A. (Davie FL) Braun William V. (Elm
출원인 / 주소	Motorola, Inc. (Schaumburg IL 02)
인용정보	피인용 횟수 : 29 인용 특허 : 0

초록 ▼

A signalling protocol comprising a plurality of interleaved phases is transmitted at various baud rates, the various baud rates being multiples of a base baud rate. The signalling protocol allows a selective call receiver to decode at an operating baud rate equivalent to the base baud rate irrespective of the transmission baud rate by decoding only a portion of the transmitted signal, the portion decoded determined by the baud rate and the address of the selective call receiver.

대표청구항 ▼

A method in a communication system for transmitting a plurality of selective call messages at a first baud rate from a terminal to at least one receiver having at least one address assigned thereto, the method comprising the steps of: at said terminal receiving a plurality of messages, each of said messages having one of a plurality of selective call addresses corresponding thereto; combining each of said messages with said one of said plurality of selective call addresses corresponding thereto to form one of said plurality of selective call messages, each of said plurality of selective call messages having a plurality of message bits; time division multiplexing said plurality of selective call messages into a number of phases to form said number of phases each comprising bits by assigning the plurality of message bits of each of said plurality of selective call messages to one of said number of phases, said number of phases determined by said first baud rate and said one of said plurality of phases for assigning each of said plurality of selective call messages determined by said first baud rate and said one of said plurality of selective call addresses corresponding to said one of said plurality of selective call messages; encoding said plurality of selective call messages into a signal by serially inserting one of said bits from each of said number of phases in a manner starting with a first of said bits stored in a first of said number of phases and thereafter sequentially inserting ones of said bits in a wraparound manner such that after inserting a first of said bits stored in a last of said number of phases, next inserting a second of said bits stored in said first of said number of phases; and transmitting said signal at said first baud rate; at each of said at least one receiver receiving and demodulating said signal; decoding a first portion of each of said plurality of selective call messages of said signal in one of said number of phases at a second baud rate to determine whether said one of said plurality of selective call addresses corresponding thereto is the address assigned to said one of said at least one receiver, said first baud rate being an integer multiple of said second baud rate and said one of said number of phases determined by said first baud rate and the address assigned to said one of said at least one receiver; and decoding a remaining portion of one of said plurality of selective call messages in said one of said number of phases at said second baud rate if said step of decoding a first portion determines that said one of said plurality of selective call addresses corresponding to said one of said plurality of selective call messages is the address assigned to said one of said at least one receiver.

이 특허를 인용한 특허 (29)

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Mantel G. David (Plantation FL) Cannon Gregory L. (Boynton Beach FL) Breeden R. Louis (Boca Raton FL), Method and apparatus for encoding and decoding information in a digtial communication system.
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Willard David F. (Plantation FL) Schwendeman Robert J. (Pompano Beach FL) Kuznicki William J. (Coral Springs FL) DeLuca Michael J. (Boca Raton FL), Method and apparatus for synchronizing to a synchronous selective call signal.
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Fitch Kenneth D. ; Jain Prabhat K. ; Soto Walter G., Method of automatically detecting the baud rate of an input signal and an apparatus using the method.
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Nguyen, Tai H.; Jones, Jason A. T.; Bradley, Jonathan G.; Seshan, Natarajan, Multi-channel serial port with programmable features.
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