Noise filtering inverse transformation
First Claim
1. A method for data recovery from a composite signal carrying a composite frame (DRCS) comprising discrete multiple tones (DMT) or multiple sub-bands (MSB) wherein said data recovery comprises signal processing in frequency domain and in time domain, the DRCS method comprising the steps of:
- processing the composite signal in frequency domain in order to recover said tones or sub-bands,wherein a known phase relation is maintained between the recovered tones or sub-bands and the composite frame;
processing the recovered tones or sub-bands in time domain in order to measure amplitudes and phases of singular half-cycles or cycles of the recovered tones or sub-bands;
transforming the measured amplitudes and phases by reversing distortions introduced by a transmission channel of the composite signal;
using the transformed amplitudes and phases for recovering data symbols encoded originally in a transmitted composite signal.
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Abstract
A method, system and apparatus for noise filtering inverse transformation (NFIT), recovering phases and amplitudes of singular cycles of data carrying tones or sub-bands from a composite signal such as OFDM, is presented herein. Such NFIT comprises adaptive inverse transformation of non-linear channel transform function and instant accommodation of time variant quickly changing characteristics of transmission channel caused by interferences including line loads, cross-talk or predictable noise.
6 Citations
5 Claims
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1. A method for data recovery from a composite signal carrying a composite frame (DRCS) comprising discrete multiple tones (DMT) or multiple sub-bands (MSB) wherein said data recovery comprises signal processing in frequency domain and in time domain, the DRCS method comprising the steps of:
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processing the composite signal in frequency domain in order to recover said tones or sub-bands, wherein a known phase relation is maintained between the recovered tones or sub-bands and the composite frame; processing the recovered tones or sub-bands in time domain in order to measure amplitudes and phases of singular half-cycles or cycles of the recovered tones or sub-bands; transforming the measured amplitudes and phases by reversing distortions introduced by a transmission channel of the composite signal; using the transformed amplitudes and phases for recovering data symbols encoded originally in a transmitted composite signal. - View Dependent Claims (2)
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3. A method for data recovery from a composite signal (DRCS) carrying a composite frame comprising discrete multiple tones (DMT) or multiple sub-bands (MSB), comprising signal processing in frequency domain and time domain wherein amplitudes or phases of a noise or other signals, surrounding a particular data carrying tone or sub-band in a transmission channel, are detected and distortions of said particular tone or sub-band are reversed;
- the DRCS method comprising the steps of;
processing the composite signal in frequency domain, in order to recover said tones or sub-bands, wherein a known phase relation is maintained between the recovered tones or sub-bands and the composite frame; processing the tones or sub-bands in time domain, in order to measure amplitudes and phases of singular half-cycles or cycles of the tones or sub-bands; detecting said amplitudes or phases of noise or other signals surrounding said particular tone or sub-band; using the detected amplitudes or phases for deriving estimates of distortions introduced by the surrounding noise or other signals to the particular tone or sub-band; using the distortions estimates for performing a reverse transformation of said measured amplitudes and phases into amplitudes and phases corresponding to amplitudes and phases encoded originally in a transmitted composite signal; using the reversely transformed amplitudes and phases for recovering data symbols encoded originally in the transmitted composite signal.
- the DRCS method comprising the steps of;
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4. A method for data recovery from a received composite signal carrying composite frame (DRRC) comprising discrete multiple tones (DMT) or multiple sub-bands (MSB), wherein said data recovery comprises signal processing in frequency domain and in time domain, the DRRC method comprising the steps of:
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using a sampling clock, synchronous in phase to the composite frame, for oversampling said received composite signal; using clocks, synchronous to the composite frame, for processing the oversampled signal in frequency domain, in order to recover said tones or sub-bands having a known phase relation to the composite frame; processing the recovered tones or sub-bands in time domain, in order to measure amplitudes or phases of singular half-cycles or cycles of the recovered tones or sub-bands; using a plurality of the measured amplitudes or phases of singular half-cycles or cycles of a particular tone or sub-band, for a recovery of an original data symbol transmitted by the particular tone or sub-band.
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5. A method for synchronous data recovery (SDR) from a composite signal carrying a composite frame comprising discrete multiple tones (DMT) or multiple sub-bands (MSB), wherein said data recovery comprises signal processing in frequency domain and in time domain, the SDR method comprising the steps of:
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processing said composite signal in frequency domain in order to recover said tones or sub-bands, wherein the frequency domain processing is driven by clocks or sub-clocks synchronous in phase to the composite frame in order to maintain a known phase relation between the recovered tones or sub-bands and the composite frame; processing the recovered tones or sub-bands in time domain, in order to measure amplitudes or phases of singular half-cycles or cycles of the recovered tones or sub-bands; using a plurality of said measured amplitudes or phases of singular half-cycles or cycles of a particular tone or sub-band, for a recovery of an original data symbol transmitted by the particular tone or sub-band.
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Specification