| 摘要 |
This invention relates to improved antenna techniques particularly for orthogonal frequency division multiplexed (OFDM) communications systems. A signal processing system (800) for determining weights for an adaptive antenna, the antenna having a plurality of antenna elements (802a-d) each for receiving a signal comprising a plurality of subcarriers, the system comprising, a plurality of inputs for receiving signals from said plurality of antenna elements, a time-to-frequency domain transformer (806) for each input for transforming the signal from each input to a plurality of subcarrier signals, a first weight determiner (802) coupled to said inputs, before the time-to-frequency domain transformer in the signal path, and configured to determine a first set of weights, one for each input, and a second weight determiner (838) coupled to said first weight determiner and configured to determine, from the determination of said first set of weights, at least one second set of weights comprising a frequency-domain weight for a subcarrier signal derived from each of said inputs. By calculating a first set of weights in the time-domain and then modifying these for each subcarrier for application in the frequency domain the weight calculation process is simplified and can be performed faster.
|
