Dc Offset Estimation in Received Signals
AssigneeTTPCOM Limited
InventorsManuel Segovia-Martinez, Navid Fatemi-Ghomi, Cyril Valadon
Life of this patent
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Abstract
A scheme for deducing a DC offset in a received signal burst acquired through a particular channel, wherein the received signal burst corresponds to a transmitted signal burst. An impulse response estimate of the channel is used to model how a known or recovered part of the transmitted burst would have been affected by passage through said channel in place of the corresponding part of the transmitted signal burst. The modeled part of the transmitted burst is then compared with the corresponding part of the received signal burst to deduce a DC offset present in the received signal burst.
Claims20
An apparatus for deducing a DC offset in a received signal burst acquired through a particular channel, wherein the received signal burst corresponds to a transmitted signal burst and the apparatus comprises a processor arranged to:
- equalize a first signal which is part of or substantially all of the received burst to produce an equalized signal;
- use an impulse response estimate of said channel to produce a test signal modeling how the equalized signal would have been affected by passage through said channel in place of the corresponding part of the transmitted signal burst;
- and
- compare the test signal with the corresponding part of the received signal burst to deduce a DC offset present in the received signal burst.
An apparatus for deducing a DC offset in a received signal burst acquired through a particular channel, wherein the received signal burst corresponds to a transmitted signal burst that is known to contain a training sequence and the apparatus comprises a processor arranged to:
- use an impulse response estimate of said channel to produce a test signal modeling how a copy of the training sequence would have been affected by passage through said channel in place of the corresponding part of the transmitted signal burst;
- and
- compare the test signal with the corresponding part of the received signal burst to deduce a DC offset present in the received signal burst.
6-7. (canceled)
A method of deducing a DC offset in a received signal burst acquired through a particular channel, wherein the received signal burst corresponds to a transmitted signal burst and the method comprising:
- equalizing a first signal which is part of or substantially all of the received burst to produce an equalized signal;
- using an impulse response estimate of said channel to produce a test signal modeling how the equalized signal would have been affected by passage through said channel in place of the corresponding part of the transmitted signal burst;
- and
- comparing the test signal with the corresponding part of the received signal burst to deduce a DC offset present in the received signal burst.
A method of deducing a DC offset in a received signal burst acquired through a particular channel, wherein the received signal burst corresponds to a transmitted signal burst that is known to contain a training sequence and the method comprises:
- using an impulse response estimate of said channel to produce a test signal modeling how a copy of the training sequence would have been affected by passage through said channel in place of the corresponding part of the transmitted signal burst;
- and
- comparing the test signal with the corresponding part of the received signal burst to deduce a DC offset present in the received signal burst.
13-19. (canceled)
The apparatus of claim 7, wherein the processor is further arranged to remove said deduced DC offset from substantially all of the received signal burst and equalize the resulting signal.
Dependencies are inferred from the claim text.