Adaptive data recovery

• US 9,584,171 B2
• Filed: 09/14/2015
• Issued: 02/28/2017
• Est. Priority Date: 12/12/2011
• Status: Active Grant

• Current Assignee: John W. Bogdan
• Original Assignee: John W. Bogdan
• Inventors: Bogdan, John W
• Primary Examiner(s): Corrielus, Jean B
• Application Number:
  US14/852,937
• Publication Number:
  US 20160006467A1
• Time in Patent Office: 533 Days
• US Class Current: 1/1
• CPC Class Codes: H03H 17/0251 Comb filters
• CPC Class Codes: H03H 17/04 Recursive filters
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0091 arrangements specific to receivers, e.g. format detection detection of data rate H04L25/0262; detection of coding rate H04L1/0046
• CPC Class Codes: H04L 25/023 with extension to other symbols
• CPC Class Codes: H04L 25/03012 operating in the time domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 25/0398 Restoration of channel reciprocity
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2695 with channel estimation, e.g. determination of delay spread, derivative or peak tracking channel estimation H04L25/0202
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 7/0079 Receiver details

Abstract

This application presents an adaptive data recovery (ADR) of original data symbols from intervals or parameters of tone signals derived from a received OFDM signal, conducted without compensating distortions or noise introduced to the received OFDM signal by an OFDM transmission channel. Such ADR is implemented by converting back the derived intervals or parameters into original data symbols corresponding to distinctive sets of the intervals or parameters which the derived intervals or parameters belong to.

Claims

1. A method for adaptive data recovery (ADR) from a received orthogonal frequency division multiplexing (OFDM) signal by an adaptive decoding of transmitted data symbols from intervals of tone signals of the received OFDM signal wherein the intervals of the tone signals correspond to cycles or half-cycles of the tone signals, wherein the received OFDM signal is produced by a transmitter coding circuit converting the transmitted data symbols into a transmitted OFDM signal and a transmission system performing a transformation of the transmitted OFDM signal into the received OFDM signal wherein the transformation introduces distortions including noise to the received OFDM signal;

wherein the ADR method comprises the steps of;

defining distinctive sets of the intervals of the tone signals wherein each of the distinctive sets comprises the intervals of the tone signals expected to represent one of the transmitted data symbols;

preloading the transmitted data symbols to a content addressed memory;

producing, using a received signal processor, the intervals of the tone signals from the received OFDM signal;

identifying ones of the distinctive sets comprising the produced intervals by processing the produced intervals;

decoding adaptively the transmitted data symbols by reversing both the transmitter coding and the transformation distortions, wherein the reversing of both the transmitter coding and the transformation distortions is achieved by reading the transmitted data symbols from the content addressed memory addressed with identifiers of the identified distinctive sets.

2. A method for adaptive data recovery (ADR) from a received orthogonal frequency division multiplexing (OFDM) signal by an adaptive decoding of transmitted data symbols from parameters of tone signals of the received OFDM signal, wherein the received OFDM signal is produced by a transmitter coding circuit converting the transmitted data symbols into a transmitted OFDM signal and a transmission system performing a transformation of the transmitted OFDM signal into the received OFDM signal wherein the transformation introduces distortions including noise to the received OFDM signal;

wherein the ADR method comprises the steps of;

defining distinctive sets of the parameters of the tone signals wherein each of the distinctive sets comprises the parameters of the tone signals expected to represent one of the transmitted data symbols;

preloading the transmitted data symbols to a content addressed memory;

producing, using a real time processor, the parameters of the tone signals from the received OFDM signal wherein the produced parameters correspond to amplitudes or phases of the tone signals, wherein operations of the real time processor are controlled by a background processor;

identifying ones of the distinctive sets comprising the produced parameters by processing the produced parameters;

decoding adaptively the transmitted data symbols by reversing both the transmitter coding and the transformation distortions, wherein the reversing of both the transmitter coding and the transformation distortions is achieved by reading the transmitted data symbols from the content addressed memory addressed with identifiers of the identified distinctive sets.

3. A method for adaptive data recovery (ADR) from a received orthogonal frequency division multiplexing (OFDM) signal by an adaptive decoding of transmitted data symbols from parameters of cycles or half-cycles of tone signals of the received OFDM signal, wherein the received OFDM signal is produced by a transmitter coding circuit converting the transmitted data symbols into a transmitted OFDM signal and a transmission system performing a transformation of the transmitted OFDM signal into the received OFDM signal wherein the transformation introduces distortions including noise to the received OFDM signal;

wherein the ADR method comprises the steps of;

defining distinctive sets of the parameters of the cycles or half-cycles of the tone signals wherein each of the distinctive sets comprises the parameters of the cycles or half-cycles of the tone signals expected to represent one of the transmitted data symbols;

preloading the transmitted data symbols to a content addressed memory;

producing, using a received signal processor, the parameters of the cycles or half-cycles of the tone signals from the received OFDM signal wherein the produced parameters correspond to amplitudes or phases of the cycles or half-cycles of the tone signals;

identifying ones of the distinctive sets comprising the produced parameters by processing the produced parameters;

decoding adaptively the transmitted data symbols by reversing both the transmitter coding and the transformation distortions, wherein the reversing of both the transmitter coding and the transformation distortions is achieved by reading the transmitted data symbols from the content addressed memory addressed with identifiers of the identified distinctive sets.