Low conversion rate digital dispersion compensation
AssigneeNortel Networks Limited
InventorsKim B. Roberts, Kuang Tsan Wu, Maurice O'Sullivan, Han Sun
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Abstract
A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1<N<2, to generate a corresponding sample stream, and filtered using a low-pass filter characteristic having a cut-off frequency corresponding to 1/2T. Phase distortions due to the filtering are compensated by digitally processing the sample stream.
Claims19
A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T, the method comprising:
- filtering the high speed signal using a low-pass filter characteristic having a cut-off frequency corresponding to approximately ½T, and a roll-off greater than 20 dB per decade;
- sampling the high speed signal at a fractional multiple (N) of the symbol rate, wherein N<2, to generate a corresponding sample stream;
- and
- digitally processing the sample stream to compensate phase distortions due to the filtering.
Dependencies are inferred from the claim text.