Inverse Signal Transformation
First Claim
1. A method for data recovery from preprocessed subspaces of OFDM signal (DRPS OFDM) for recovering transmitted data from a preprocessed signal produced by a transmission channel which includes a data coding circuit, encoding said transmitted data into transmitted OFDM frames defining data carrying tones or sub-bands, and a signal transmission link and a preprocessor of received OFDM frames, transforming said transmitted OFDM frames into preprocessed signal subspaces representing specific OFDM tones or sub-bands, wherein said link introduces deterministic or random distortions affecting received signal subspaces and said preprocessor transforms said received signal subspaces into said preprocessed signal subspaces;
- wherein the DRPS OFDM comprises;
deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable recovery of said transmitted data from specific said preprocessed subspaces identified as comprising specific said preprocessed signals;
comparing a set of samples of an interval of said preprocessed signal with elements of a reference frame related to a particular said preprocessed signal subspace,wherein this particular reference frame corresponds to a half-cycle or cycle of a particular said tone or sub-band represented by this preprocessed signal subspace;
using a result of a single said comparison or results of multiple said comparisons for identifying a specific said preprocessed subspace which said preprocessed signal interval belongs to;
applying said inverse transformation to the identified subspace in order to recover transmitted data carried by said preprocessed signal interval.
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Abstract
This application presents inverse signal transformation (IST) reversing transmission channel transfer function, in order to achieve a direct recovery of original data and synchronizing clock from received signals affected by all deterministic and random distortions introduced by the channel. The direct data recovery can eliminate an intermediate recovery of signal transmitted originally from received signal, required in conventional solutions before actual data recovery can be made. Therefore IST can prevent signal processing errors added by such intermediate recovery and reduce power consumption and computing resources required in conventional receivers.
12 Citations
3 Claims
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1. A method for data recovery from preprocessed subspaces of OFDM signal (DRPS OFDM) for recovering transmitted data from a preprocessed signal produced by a transmission channel which includes a data coding circuit, encoding said transmitted data into transmitted OFDM frames defining data carrying tones or sub-bands, and a signal transmission link and a preprocessor of received OFDM frames, transforming said transmitted OFDM frames into preprocessed signal subspaces representing specific OFDM tones or sub-bands, wherein said link introduces deterministic or random distortions affecting received signal subspaces and said preprocessor transforms said received signal subspaces into said preprocessed signal subspaces;
- wherein the DRPS OFDM comprises;
deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable recovery of said transmitted data from specific said preprocessed subspaces identified as comprising specific said preprocessed signals; comparing a set of samples of an interval of said preprocessed signal with elements of a reference frame related to a particular said preprocessed signal subspace, wherein this particular reference frame corresponds to a half-cycle or cycle of a particular said tone or sub-band represented by this preprocessed signal subspace; using a result of a single said comparison or results of multiple said comparisons for identifying a specific said preprocessed subspace which said preprocessed signal interval belongs to; applying said inverse transformation to the identified subspace in order to recover transmitted data carried by said preprocessed signal interval.
- wherein the DRPS OFDM comprises;
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2. A method for data recovery from preprocessed subspaces of OFDM signal using processed signal parameters (DRPS PSP OFDM) for recovering transmitted data from a preprocessed signal produced by a transmission channel which includes a data coding circuit, encoding said transmitted data into transmitted OFDM frames defining data carrying tones or sub-bands, and a signal transmission link and a preprocessor of received OFDM frames, transforming said transmitted OFDM frames into preprocessed signal subspaces representing specific OFDM tones or sub-bands, wherein said link introduces deterministic or random distortions affecting received signal subspaces and said preprocessor transforms said received signal subspaces into said preprocessed signal subspaces;
- wherein the DRPS PSP OFDM comprises;
deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable recovery of said transmitted data from specific said preprocessed subspaces identified as comprising specific said preprocessed signals; processing said preprocessed subspaces in order to produce processed signal parameters enabling selection of a single reference frame or multiple reference frames close to these preprocessed subspaces; using said processed signal parameters for said selection of said close reference frame or frames; comparing a set of samples of an interval of said preprocessed signal with elements of said selected reference frame, using a result of a single said comparison or results of multiple said comparisons for identifying a specific said preprocessed signal subspace which said preprocessed signal interval belongs to; applying said inverse transformation to the identified subspace in order to recover data carried by said received signal interval.
- wherein the DRPS PSP OFDM comprises;
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3. A method for data recovery from processed parameters of OFDM signal (DRPP OFDM) for recovering transmitted data from processed signal parameters produced by a transmission channel which includes a data coding circuit, encoding said transmitted data into transmitted OFDM frames defining data carrying tones or sub-bands, and a signal transmission link, transforming said transmitted OFDM frames into received signal subspaces affected by deterministic or random distortions, and a preprocessor of said received signal subspaces, transforming them into OFDM tones or sub-bands, and a processor of said tones or sub-bands, calculating processed signal parameters characterizing amplitudes and phases of half cycles or cycles of OFDM tones or sub-bands;
- wherein the DRPSP OFDM comprises the steps of;
deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable recovery of said transmitted data from said processed signal parameters; comparing a particular said processed signal parameter with reference or references related to it, wherein said related reference or references characterize a sub-range of said processed signal parameter corresponding to a specific said transmitted data; using a result of a single said comparison or results of multiple said comparisons for identifying said sub-range of processed signal parameter; applying said inverse transformation to the identified range in order to recover transmitted data corresponding to it.
- wherein the DRPSP OFDM comprises the steps of;
Specification