# US 2014/0192913 A1 · Direct Data Recovery

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- Number: US 2014/0192913 A1
- Document ID: US20140192913A1
- Status: Published application
- Kind: A1
- Application number: 13/844,722
- Filed: 2013-03-15
- Published: 2014-07-10
- Earliest claimed: 2005-06-27
- Assignees: John W. Bogdan
- Inventors: John W. Bogdan
- Web page: https://patentgrep.com/patent/US20140192913A1

## CPC

- H04L 1/0091: {arrangements specific to receivers, e.g. format detection (detection of data rate H04L25/0262; detection of coding rate H04L1/0046)}
- H03H 17/0251: {Comb filters}
- H03H 17/04: Recursive filters
- H04L 25/0398: {Restoration of channel reciprocity}
- H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)}
- H04L 27/2657: {Carrier synchronisation}
- H04L 27/2695: {with channel estimation, e.g. determination of delay spread, derivative or peak tracking (channel estimation H04L25/0202)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## 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.

## Claims

### Claim 1

A method and system for direct data recovery using parameters of sub-band cycles (DDR PSBC) wherein such DDR PSBC recovers transmitted data symbols from a signal received from an OFDM transmission channel which includes a data coding circuit encoding transmitted symbols into transmitted OFDM frames, a transmission link transforming said transmitted frames into subspaces of received OFDM frame wherein the transmission link introduces deterministic or random distortions affecting said frame subspaces and a processor transforming said frame subspaces into subranges of amplitudes/phases of cycles or half cycles of sub-band signals of said received frame, wherein specific said amplitudes/phases subranges correspond to specific said transmitted symbols; wherein the DDR PSBC comprises:
deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable said recovery of said transmitted symbols from said amplitudes/phases subranges;
wherein such derivation includes producing references defining said amplitudes/phases subranges and an assignment of said specific transmitted symbols as corresponding to said specific amplitudes/phases subranges;
processing a particular said received frame in order to estimate particular said amplitudes/phases of cycles or half cycles affected by the distortions introduced by the transmission link;
using said references for identifying particular said amplitudes/phases subranges comprising the particular amplitudes/phases of cycles or half cycles,
in order to utilize said assignment for recovering particular said transmitted symbols corresponding to the particular said received frame.

### Claim 2

A method and system for direct data recovery using parameters of sub-bands (DDR PSB) wherein DDR PSB recovers transmitted data symbols from a signal received from an OFDM transmission channel which includes a data coding circuit encoding transmitted symbols into transmitted OFDM frames, a transmission link transforming said transmitted frames into subspaces of received OFDM frame wherein the transmission link introduces deterministic or random distortions affecting said frame subspaces and a processor transforming said frame subspaces into subranges of amplitudes/phases of sub-bands of said received frame, wherein specific said amplitudes/phases correspond to specific said transmitted symbols; wherein the DDR PSB comprises:
deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable said recovery of said transmitted symbols from said amplitudes/phases subranges;
wherein such derivation includes producing references defining said amplitudes/phases subranges and an assignment of said specific transmitted symbols as corresponding to said specific amplitudes/phases subranges;
processing a particular said received frame in order to estimate particular said amplitudes/phases affected by the distortions introduced by the transmission link;
using said references for identifying particular said amplitudes/phases subranges comprising the particular amplitudes/phases,
in order to utilize said assignment for recovering particular said transmitted symbols corresponding to the particular said received frame.