Method and apparatus employing a remote wireless repeater for calibrating a wireless base station having an adaptive antenna array
First Claim
1. In a wireless communication system having at least one remote device for communicating with a base transceiver station (BTS) and a plurality of mobile stations, said BTS having an adaptive antenna array including a plurality of antenna elements, a method for determining calibration factors for respective transmit and receive paths associated with each of said antenna elements, comprising the steps of:
- transmitting a downlink signal from said BTS to said remote device from each of said antenna elements;
retransmitting from said remote device said downlink signals back to said BTS as at least one uplink signal;
receiving said uplink signal at said BTS, and determining calibration factors for said respective antenna transmit and receive paths.
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Accused Products
Abstract
A method and apparatus for calibration of an adaptive antenna array in a wireless communication system having at least one remote device for communicating with a base transceiver station (BTS) and a plurality of mobile stations can determine calibration factors for respective antenna transmit and receive paths without the need for any additional or external equipment for calibration. Calibration factors for respective transmit and receive paths associated with each of the antenna elements are determined by transmitting a downlink signal from the BTS to the remote device from each of the antenna elements, retransmitting from the remote device the downlink signals back to the BTS as at least one uplink signal, and receiving the uplink signal at the BTS.
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Citations
18 Claims
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1. In a wireless communication system having at least one remote device for communicating with a base transceiver station (BTS) and a plurality of mobile stations, said BTS having an adaptive antenna array including a plurality of antenna elements, a method for determining calibration factors for respective transmit and receive paths associated with each of said antenna elements, comprising the steps of:
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transmitting a downlink signal from said BTS to said remote device from each of said antenna elements;
retransmitting from said remote device said downlink signals back to said BTS as at least one uplink signal;
receiving said uplink signal at said BTS, and determining calibration factors for said respective antenna transmit and receive paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18)
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15. A self-calibrating communications system not requiring any additional or external equipment for calibration, the system comprising:
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a base transceiver station (BTS) having an antenna array with a plurality of antenna elements;
at least one remote device for communicating with a plurality of mobile stations and said BTS, said remote device configured to be operated in a loopback mode, wherein calibration signals transmitted by said BTS are re-transmitted by said remote device back to said BTS during calibration, whereby calibration factors for said respective antenna transmit and receive paths can be determined without the need for any additional or external equipment for calibration.
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Specification