Multiplex communications – Wide area network – Packet switching
Patent
1986-10-31
1989-07-25
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 11, H04J 114, H04J 900
Patent
active
048520861
ABSTRACT:
A radio communications system is described in which analog voice signals are transmitted and received via single sideband amplitude modulation, and digital data signals are transmitted and received via narrowband frequency modulation in a single trunked radio system having dedicated channel bandwidths. The base station continuously transmits the FM signalling information on a dedicated control channel. The remote station transceiver initially acquires lock to the data channel FM carrier, which is then demodulated to determine the frequency of an assigned voice channel. The remote station then acquires lock to the single sideband pilot carrier on the appropriate voice channel. The controller incorporates a memory state for holding AFC for the mobile transmit frequency. In the preferred embodiment, the data channel incorporates 2400 bps FSK-FM data in a 6.25 KHz channel bandwidth, while the voice channel includes a reduced pilot carrier located below the voice band for AFC and AGC reference, and an audio subcarrier located above the voice band for low speed FM data within the same 6.25 KHz channel bandwidth.
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Eastmond Bruce C.
Phillips Sharon E. T.
Griffin Robert L.
Motorola Inc.
Southard Donald B.
Telesz Jr. Andrew J.
Warren Charles L.
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