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Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to extend overall system dynamic range

  • US 5,590,156 A
  • Filed: 04/22/1994
  • Issued: 12/31/1996
  • Est. Priority Date: 04/22/1994
  • Status: Expired due to Term
First Claim
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1. A basestation for processing signals in a multiple subscriber unit wireless communication system comprising:

  • an antenna for receiving signals from a plurality of the subscriber units;

    a power splitter, connected to the antenna, to provide a plurality of power splitter output signals;

    a plurality of gain control means, each one of the gain control means being connected to receive a respective one of the power splitter output signals, and each gain control means having a separately adjustable gain control input, and each gain control means providing a wideband signal;

    a plurality of wideband tuner sections, with each tuner section being connected to receive one of the wideband signals, and with each wideband tuner section operating over a respectively different frequency bandwidth, and each wideband tuner section being connected to provide a wideband tuner output signal;

    a plurality of channelization means, each channelization means being connected to receive a respective one of the wideband tuner output signals, and with each channelization means providing multiple channel signal outputs, each channel signal output having a predetermined channel bandwidth; and

    channel assignment means, including;

    (i) access control signal receiving means, for receiving an access control signal requesting access to a radio frequency channel by a selected one of the subscriber units, and for determining a received signal strength indication, RSSI, of that access control signal;

    (ii) means for generating a frequency control signal designating a selected transmit frequency, and for receiving the RSSI of the access control signal, the selected transmit frequency being selected from within a first frequency bandwidth over which a first one of the plurality of wideband tuner sections operates if the RSSI is above a minimum threshold and within a first range of signal strengths associate with the first wideband tuner section, and the transmit frequency being selected within a second frequency bandwidth over which a second one of the plurality of wideband tuner sections operates if the RSSI is above the minimum threshold and within a second range of signals strengths associated with the second wideband tuner section; and

    (iii) frequency assignment means for receiving the frequency control signal and for assigning the selected subscriber unit to operate on the selected transmit frequency.

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