| 摘要 |
<p>A transmission system (58) including an amplifier (22) and a locally-adapted, parallel T-spaced linear predistorter (60). The predistorter (60) includes a plurality of parallel adaptive filters (62-68) that receive a modulated in-phase and quadrature phase signal. A separate sampling input is applied to each adaptive filter (62-68) during a symbol period. For each sampling time input, an error is calculated which corresponds to its position in the eye portion of an eye diagram, and is correlated to a modulator output using a zero-forcing algorithm. The output of each adaptive filter (62-68) is multiplexed sequentially by a multiplexer (70) to provide a predistorter waveform. The predistorter (60) allows independent equalization at each sampling point in the symbol period of the eye portion.</p> |
