| 摘要 |
<p>An OFDM active deflector comprises an input antenna (14) for receiving an OFDM input signal, an output antenna (18) for transmitting an OFDM signal on substantially the same frequency as the input signal, and an amplification path (52,54,42,56,60,64,66,38) between the input and output antennas. The amplification path provides substantially linear processing and includes a delay (60). The deflector includes means (72) responsive to the signal in the amplification path for producing a plurality of control coefficients, a transversal filter (76) receiving the signal in the amplification path and controlled by the control coefficients to provide a modified signal, and a combiner (42) for combining the modified signal with the signal in the amplification path so as to reduce the effect of the feedback. In this way, unwanted feedback from the output of the active deflector to the input is substantially eliminated. The compensation conveniently makes use of the inherent noise-like property of the OFDM signal, however a separate noise signal may be added if necessary. <IMAGE></p> |
