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Isolation measurement and self oscillation prevention in TDD-OFDM repeater for wireless broadband distribution to shadowed areas

  • US 8,953,503 B2
  • Filed: 04/05/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 05/16/2008
  • Status: Active Grant
First Claim
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1. A method of establishing and maintaining isolation status of a radio frequency (RF) repeater that includes a donor RF transceiver, a server RF transceiver, a donor transmit antenna, a server receive antenna and a modem device, in a time-division-duplexed (TDD) system, the method comprising the steps of:

  • registering the RF repeater with a base transceiver station (BTS) using said modem device;

    adjusting the donor RF output level using a calibrated value for the donor RF transceiver;

    synchronizing the modem device to a BTS transmission received at the donor RF transceiver;

    providing synchronization information to the server RF transceiver of the repeater via said modem device;

    performing isolation detection and measurement between the donor transmit antenna and the server receive antenna of the RF repeater via said modem device to determine an isolation value during at least one ofsaid registering of the RF repeater, andone or more scheduled management bursts,wherein the step of performing isolation detection and measurement further comprisesdetecting a received signal preamble from the modem at the server antenna receiver of the RF repeater,evaluating, at the modem coupled to the donor transmit antenna, a preamble output level,evaluating, at the modem coupled to the server receive antenna, a preamble power input level,calculating the isolation value between the donor transmit antenna and the server receive antenna using the evaluated preamble output level and preamble power input level; and

    adjusting, by said modem device, automatic gain control parameters of the donor RF transceiver and the server RF transceiver based upon the calculated isolation value.

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