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RF repeater for TDMA mobile telephone systems
| Details |
Inventors: Beasley, Andrew; Schebel, Dean;
Assignee: PCS Microcell International (Bridgetown, BB)
Primary Examiner: Bost; Dwayne D.
Assistant Examiner: Maung; Nay
Attorney, Agent or Firm: Knobbe Martens Olson & Bear, LLP
An RF repeater for exchanging time division multiple access (TDMA) transmit and receive signals between a mobile handset and a CATV plant or other signal conduit has a signal timing detector responsive to the timing of transmit signals being broadcast to the handset to provide timing information indicative of the timing of receive signals being received from the handset. A signal level detector responsive to the signal level of the receive signals provides signal level information. A signal control device responsive to the timing information and the signal level information provides a signal level control output for time slotted control of the receive signals. The timing and signal level information may be used to effect diversity selection between receive signals from two spaced antennas at the repeater and/or diversity selection may be effected between two versions of the receive signal at a base station after passing through the signal conduit. |
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DETAILED DESCRIPTION The present invention is based on an understanding by the present inventors that the timing of a receive signal in the receive signal path of an RF repeater can be derived from that of a transmit signal in the transmit signal path of the RF repeater, thus enabling the receive signal level to be detected and processed on a time slotted basis, so that the receive signal can be processed, e.
g.
by diversity selection, to counteract distortion of the receive signal.
More particularly, according to the present invention, the timing of the TDMA receive signal is derived from an analysis of the transmit signal.
Since the receive signal is slaved off of the transmit signals at the mobile handset, the receive signal timing can thus be determined from that of the transmit signal, within certain bounds allowing for timing slippage due to propagation delays and timing advances sent from the base station.
When the timing of the receive signal has thus been obtained, the receive signal can be measured for signal strength on a time slotted, individual channel basis, at the RF repeater to enable diversity selection, signal combination, signal attenuation or other signal processing.
In a preferred embodiment of the invention, a method of exchanging TDMA signals between a base station and a mobile TDMA handset comprises the steps of supplying a TDMA transmit signal from the base station through a signal conduit, e.
g.
a CATV plant, to an RF repeater, detecting the timing of the transmit signal at the RF repeater, transmitting the transmit signal as radio signals from the RF repeater to the handset, and transmitting TDMA receive signal from the handset to the RF repeater.
The timing of the receive signal is slaved to the transmit signals by the handset.
By receiving the receive signal at a pair of spaced-apart antennas, corresponding first and second receive signals are provided at the RF repeater.
The signal levels of the first and second receive signals are detected and are processed, using the transmit signal timing, to provide a control output, which is employed to alter the signal level of at least one of the first and second receive signals, which is then supplied to the base station
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Multiplexer-related 
