Apparatus for multi-rate simulcast communications

Details Apparatus for multi-rate simulcast communications Apparatus for multi-rate simulcast communications

1995-05-12

1996-07-16

Kizou, Hassan

Multiplex communications

Wide area network

Packet switching

370 23, 370 691, 370 84, 370 92, 3701101, 455 512, 455 561, H04B 700, H04J 102, H04J 1100

Patent

active

055373984

ABSTRACT:
A messaging system (500) for transmitting a message to a subscriber unit (312). The messaging system (500) includes a plurality of geographically distributed messaging transmitters (302-310), each transmitter designed to transmit in a first modulation format, such as FM, during a first transmission portion (102) including address information; and in a second modulation format, such as OFDM, during a second transmission portion (104) including message data (110) transmitted in frames. The address information includes message characterization information (108) defining a predetermined frame rate. The second transmission portion (104) includes message data (110) transmitted in frames representing a time sequence of N data bits at the predetermined frame rate and provides a plurality of carrier frequencies related to a frequency domain representation of the time sequence of data bits. The predetermined frame rate numerically matches the predetermined symbol rate. The subscriber unit (312) includes circuitry for receiving and demodulating both modulation formats.

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"The Coded Orthogonal Frequency Division Multiplexing (COFDM) Technique, and its Application to Digital Radio Broadcasting Towards Mobile Receivers", J. C. Rault, D. Castelain, B. LeFloch, CCETT (Centre Commun d'Etudes de Telediffusion et Telecommunications), 1989 IEEE, pp. 0428-0432.

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