| 摘要 |
Disclosed is a method of initially acquiring tap weights for an FIR filter used to correct distortion in an optical communications receiver. The receiver acquires and stores a series of samples 160 of a received signal. A blind optimisation algorithm 162 is then applied to the series of samples to obtain an estimate of tap weights for a Finite Impulse Response (FIR) filter of the receiver configured to equalise a received optical signal. A further embodiment, a method optimising tap weights in a FIR filter to reduce distortion in an optical receiver comprises: monitoring the tap weight centre of the filter; calculating an offset of tap weight centre from the central tap position of the FIR filter, and using the offset to define a sampling clock phase of an ADC, the output of which is passed to the FIR filter. |
