Weight Training For Antenna Array Beam Patterns in FDD/TDMA Terminals
First Claim
1. A method for weight training reception and transmission beam forms in a frequency division duplex/time division multiple access handset terminal, the method comprising the steps of transmitting through a plurality of antennae adapted to a beam pattern with highest average received power and determining the beam pattern with highest average received power, wherein determining the beam pattern with highest average received power comprises the steps of selecting a terminal, measuring the received signal power during a time slot destined for a user other than the terminal, and averaging the received signal power with the average received power for the receive beam pattern, and comparing the average received power of each time slot, wherein measuring the received signal power comprises generating a receive beam pattern during an occupied time slot and measuring the signal power received during the time slot, wherein generating a receive beam pattern during an occupied time slot comprises the method of measuring received signal power in time slots not assigned to the terminal to determine which time slots are occupied.
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Abstract
A method for weight training for beamforming in handset terminals deployed in a system employing Frequency Division Duplexing and Time-Division Multiple Access (FDD/TDMA). Generally there is signal in time slots that are not destined for a certain terminal. During this time the receiver scans a beam around the terminal and measures received signal strength, determining the best beam angle and storing corresponding weights for transmission.
21 Citations
8 Claims
- 1. A method for weight training reception and transmission beam forms in a frequency division duplex/time division multiple access handset terminal, the method comprising the steps of transmitting through a plurality of antennae adapted to a beam pattern with highest average received power and determining the beam pattern with highest average received power, wherein determining the beam pattern with highest average received power comprises the steps of selecting a terminal, measuring the received signal power during a time slot destined for a user other than the terminal, and averaging the received signal power with the average received power for the receive beam pattern, and comparing the average received power of each time slot, wherein measuring the received signal power comprises generating a receive beam pattern during an occupied time slot and measuring the signal power received during the time slot, wherein generating a receive beam pattern during an occupied time slot comprises the method of measuring received signal power in time slots not assigned to the terminal to determine which time slots are occupied.
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8. A method for achieving maximal ratio combining comprising the steps of setting all but one of the antenna weights to zero, measuring the signal power for each antenna, scaling the magnitude of the antenna weights proportional to the square root of the received power, and adjusting the phase of each antenna element during the time slots destined for other terminals and alternating between a left adjacent antenna beam pattern and a right adjacent antenna beam pattern during the time slot of the destined terminal.
Specification