Isolation measurement and self oscillation prevention in TDD-OFDM repeater for wireless broadband distribution to shadowed areas
First Claim
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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0 Petitions
Accused Products
Abstract
A method for determining isolation status of the RF repeater is provided. A modem in the repeater registers with a base transceiver station (BTS). Uplink output levels of a donor RF transceiver are calibrated and stored in the modem. The modem is synchronized to a BTS transmission received at the donor RF transceiver and the synchronization information is provided to a server RF transceiver of the repeater. Isolation detection and measurement can then be performed between donor transmit antenna and receive server antenna of the RF repeater and the automatic gain control parameter of donor RF transceiver and server RF transceiver are adjusted based upon the isolation detection and measurement value. The isolation and detection can be implemented in a co-processor coupled to the donor and server transceivers.
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Citations
19 Claims
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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:
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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 of said registering of the RF repeater, and one or more scheduled management bursts, wherein the step of performing isolation detection and measurement further comprises detecting 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A processor, in a radio frequency (RF) repeater, for establishing and maintaining isolation status of the 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 processor performing the steps of:
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registering the RF repeater with a base transceiver station (BTS), said registering further comprising 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; wherein the step of performing isolation detection and measurement further comprises; detecting a received signal preamble from the BTS at the server RF transceiver of the RF repeater; evaluating a preamble output level from the donor transmit antenna; evaluating a preamble power input level from the server receive antenna; and calculating an isolation value between the donor transmit antenna and the server receive antenna using the evaluated preamble output level and preamble power input level; 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; and adjusting automatic gain control parameters of the donor RF transceiver and the server RF transceiver based upon said isolation value via said modem device. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A radio frequency (RF) repeater comprising:
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a donor RF transceiver coupled to a donor antenna having a transmit portion and a receive portion; a server RF transceiver coupled to a server antenna having a transmit portion and a receive portion; a modem, coupled to the donor transceiver and the server transceiver, the modem performing steps comprising; registering the RF repeater with a base transceiver station (BTS); adjusting the donor RF output level using a calibrated value for the donor RF transceiver; synchronizing said modem to a BTS transmission received at the donor RF transceiver; providing synchronization information to the server RF transceiver of the repeater via said modem; performing, during at least one scheduled management burst, isolation detection and measurement between the transmit portion of the donor antenna and the receive portion of the server antenna of the RF repeater via said modem to determine an isolation value; wherein the step of performing isolation detection and measurement further comprises; detecting a received signal preamble from the BTS at said server RF transceiver of the RF repeater; evaluating a preamble output level from the transmit portion of the donor antenna; evaluating a preamble power input level from the receive portion of the server antenna; and calculating an isolation value between the transmit portion of the donor antenna and the receive portion of the server antenna using the evaluated preamble output level and preamble power input level; and adjusting automatic gain control parameters of the donor RF transceiver and the server RF transceiver based upon said isolation value. - View Dependent Claims (18, 19)
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Specification