Selective call receiver for receiving a multiphase multiplexed signal

• US 5,371,737 A
• Filed: 12/28/1993
• Issued: 12/06/1994
• Est. Priority Date: 01/02/1990
• Status: Expired due to Term

• Current Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Willard, David F., Sandvos, Jerry L. A., Braun, William V., DeLuca, Michael J., Nelson, Leonard E., Schwendeman, Robert J.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Hsu, Alpus H.
• Application Number:
  US08/174,577
• Time in Patent Office: 343 Days
• Field of Search: 370/79, 370/80, 370/81, 370/84, 370/95.1, 370/95.3, 370/104.1, 370/112, 370/118, 340/825.44, 340/825.47, 340/825.48, 340/825.52, 455/38.1, 455/343
• US Class Current: 370/314
• CPC Class Codes: H04W 8/245 from a network towards a terminal
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: H04W 88/187 using digital or pulse address codes

Abstract

A selective call receiver receives a signal having a baud rate and comprising a number of phases. The number of phases are time division multiplexed to form the signal. The selective call receiver has selective call address information assigned thereto and includes a receiver for receiving and demodulating the signal and a memory for storing predetermined information. A demultiplexer is coupled to the receiver and the memory for demultiplexing the signal to recover one of the number of phases in response to the predetermined information and the baud rate. The selective call receiver also includes a decoder coupled to the demultiplexing means for decoding said one of said number of phases of said signal to derive a selective call message therefrom.

Claims

1. A selective call receiver for receiving a signal comprising a number of time division multiplexed phases (N), wherein N is an integer, which are transmitted at N times a baud rate, the selective call receiver having selective call address information assigned thereto and comprising:

receiver means for receiving and demodulating said signal;

memory means for storing predetermined information;

demultiplexing means coupled to said receiver means and said memory means for demultiplexing said signal to recover one of said number of time division multiplexed phases in response to said predetermined information and said baud rate; and

decoding means coupled to said demultiplexing means for decoding said one of said number of time division multiplexed phases of said signal to derive a selective call message therefrom.

2. The selective call receiver of claim 1 wherein said memory means further stores said selective call address information and wherein said predetermined information comprises at least a portion of said selective call address information.

3. The selective call receiver of claim 2 wherein said memory means comprises a nonvolatile memory device for storing said selective call address information.

4. The selective call receiver of claim 2 wherein said selective call address information comprises a plurality of bits of varying significance including two least significant bits and said at least a portion of said selective call address information comprises the two least significant bits of said address information.

5. The selective call receiver of claim 1, wherein said signal further comprises baud rate information and wherein said decoding means further decodes said baud rate information from within said signal and decodes said one of said number of time division multiplexed phases of said signal, said one of said number of time division multiplexed phases determined by said baud rate information and said predetermined information.

6. The selective call receiver of claim 5 wherein said signal includes a synchronizing portion comprising said baud rate information, the selective call receiver further comprising synchronizing means coupled to said receiver means and said decoding means for synchronizing said decoding means to said at least one of said number of phases of said signal in response to said synchronizing portion of said signal.

7. The selective call receiver of claim 1 wherein said at least one of said number of time division multiplexed phases comprises interleaved bits, said selective call receiver further comprising deinterleaving means for deinterleaving said one of said number of time division multiplexed phases to recover deinterleaved bits, and wherein said decoding means is coupled to said deinterleaving means for decoding said deinterleaved bits to derive said selective call message.