Direct data recovery
First Claim
1. A method for direct data recovery using parameters of cycles or half-cycles of (tones (DDR PCT) of a received orthogonal frequency division multiplexing (OFDM) signal, wherein the parameters are derived and outputted by a transmission system which includes a coding circuit encoding transmitted data symbols into a transmitted OFDM signal, a transmission link transforming the transmitted OFDM signal into the received OFDM signal and introducing deterministic or random distortions affecting the received OFDM signal, a processor deriving the parameters from the received OFDM signal wherein subranges of the parameters correspond to the transmitted data symbols;
- wherein the DDR PCT method comprises the steps of;
deriving references defining the subranges;
deriving an assignment of the transmitted data symbols to the defined subranges;
processing, using the processor, the received OFDM signal in order to derive the parameters characterizing amplitudes and phases of the cycles or the half-cycles of the tones;
using the references for identifying the defined subranges comprising the derived parameters;
applying the derived assignment to the identified subranges in order to recover the transmitted data symbols, wherein the derived parameters and the identified subranges remain affected by the deterministic or random distortions.
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Abstract
The direct data recovery (DDR) uses adaptive data decoding (ADD) to combine a conventional reversal of data coding made on a transmit side with a reversal of received signal distortions introduced by a transmission channel;
- wherein both such reversals are achieved by the same conversion of a sub-range parameter or a referencing subspace (corresponding to said received signal) into data transmitted originally,
- by applying an ADD step comparing said sub-range parameter or referencing subspace with its reference or reference frame and using a result of such comparison for addressing a Content Addressed Memory (CAM) outputting recovered data.
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Citations
12 Claims
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1. A method for direct data recovery using parameters of cycles or half-cycles of (tones (DDR PCT) of a received orthogonal frequency division multiplexing (OFDM) signal, wherein the parameters are derived and outputted by a transmission system which includes a coding circuit encoding transmitted data symbols into a transmitted OFDM signal, a transmission link transforming the transmitted OFDM signal into the received OFDM signal and introducing deterministic or random distortions affecting the received OFDM signal, a processor deriving the parameters from the received OFDM signal wherein subranges of the parameters correspond to the transmitted data symbols;
- wherein the DDR PCT method comprises the steps of;
deriving references defining the subranges; deriving an assignment of the transmitted data symbols to the defined subranges; processing, using the processor, the received OFDM signal in order to derive the parameters characterizing amplitudes and phases of the cycles or the half-cycles of the tones; using the references for identifying the defined subranges comprising the derived parameters; applying the derived assignment to the identified subranges in order to recover the transmitted data symbols, wherein the derived parameters and the identified subranges remain affected by the deterministic or random distortions. - View Dependent Claims (2, 3)
- wherein the DDR PCT method comprises the steps of;
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4. A method for direct data recovery using parameters of tones (DDR PT) of a received orthogonal frequency division multiplexing (OFDM) signal, wherein the parameters are derived and outputted by a transmission system which includes a coding circuit encoding transmitted data symbols into a transmitted OFDM signal, a transmission link transforming the transmitted OFDM signal into the received OFDM signal and introducing deterministic or random distortions affecting the received OFDM signal, a processor deriving the parameters from the received OFDM signal wherein subranges of the parameters correspond to the transmitted data symbols;
- wherein the DDR PT method comprises the steps of;
deriving references defining the subranges; deriving an assignment of the transmitted data symbols to the defined subranges; processing, using the processor, the received OFDM signal in order to derive the parameters characterizing amplitudes and phases of the tones; using the references for identifying the defined subranges comprising the derived parameters; applying the derived assignment to the identified subranges in order to recover the transmitted data symbols, wherein the derived parameters and the identified subranges remain affected by the deterministic or random distortions. - View Dependent Claims (5, 6)
- wherein the DDR PT method comprises the steps of;
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7. A method for direct data recovery using tone signals (DDR TS) of a received orthogonal frequency division multiplexing (OFDM) signal, wherein the tone signals are produced by a transmission system which includes a coding circuit encoding transmitted data symbols into a transmitted OFDM signal, a transmission link transforming the transmitted OFDM signal into the received OFDM signal and introducing deterministic or random distortions affecting the received OFDM signal, a processor deriving the tone signals from the received OFDM signal wherein subspaces of the tone signals correspond to the transmitted data symbols;
- wherein the DDR TS method comprises the steps of;
deriving reference frames defining the subspaces; deriving an assignment of the transmitted data symbols to the defined subspaces; processing, using the processor, the received OFDM signal in order to derive the tone signals; identifying the defined subspaces comprising the derived tone signals, by comparing elements of intervals of the derived tone signals with elements of the reference frames; applying the derived assignment to the identified subspaces in order to recover the transmitted data symbols, wherein the derived tone signals and the identified subspaces remain affected by the deterministic or random distortions. - View Dependent Claims (8, 9, 10, 11, 12)
- wherein the DDR TS method comprises the steps of;
Specification