Adaptive transceiver system
First Claim
1. A method for delay calibrating a multi-antenna transmitter having at least two transmitter chains each with a respective antenna, the method comprising iteratively performing the steps of:
- (a) transmitting signals to mobile stations by means of the antennas;
(b) determining feedback data indicative of the relative delay of the transmitted signals; and
(c) adjusting the delay of one or more of the transmit chains on the basis of the feedback data.
2 Assignments
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Accused Products
Abstract
A method for forming signals at a transceiver having at least two transmit and receive chains, the method comprising the steps of: (a) determining the phase difference and relative amplitude of signals from a set comprising a plurality of mobile stations as received through the receive chains, (b) receiving from each of at least one of the mobile stations messages indicative of the strength or quality of signals as received by the respective mobile station from the transceiver and on the basis of those messages determining a phase offset and amplitude distortion, internal to the transceiver, resulting from the differences in the instrumental properties of the receiver and transmitter chains in the transceiver; and (c) transmitting signals from each of the transmitter chains by applying to each transmitter chain amplitude weights and signal delays, selected on the basis of the determined phase offset and amplitude distortion, and received relative amplitudes and phase differences.
27 Citations
24 Claims
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1. A method for delay calibrating a multi-antenna transmitter having at least two transmitter chains each with a respective antenna, the method comprising iteratively performing the steps of:
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(a) transmitting signals to mobile stations by means of the antennas;
(b) determining feedback data indicative of the relative delay of the transmitted signals; and
(c) adjusting the delay of one or more of the transmit chains on the basis of the feedback data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A communication system comprising a multi-antenna transmitter having at least two transmitter chains each with a respective antenna, and a plurality of mobile stations, wherein the system is arranged to perform delay calibration of the transmitter by iteratively performing the steps of:
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(a) transmitting signals to mobile stations by means of the antennas;
(b) determining feedback data indicative of the relative delay of the transmitted signals; and
(c) adjusting the delay of one or more of the transmit chains on the basis of the feedback data.
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Specification