METHOD OF CODING DATA, DECODING METHOD, TRANSMITTER AND RECEIVER

Abstract

A method of coding data, wherein one or more data symbols are coded by using, OFDM, characterized by using Hermite polynomials as an orthogonal function system for said orthogonal frequency division multiplexing, whereby an OFDM-signal is obtained, transforming said OFDM-signal into the time domain thus obtaining a time domain signal and performing a step of time division multiplexing, TDM, by combining said time domain signal with one or more further time domain signals, whereby a TDM-signal is obtained.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Further applications, features and advantages of the present invention are described in the following detailed description with reference to the drawings, in which

FIG. 1 depicts a simplified flow chart representing a first embodiment of the inventive method,

FIG. 2 depicts a simplified block diagram of a transmission system comprising an inventive transmitter and an inventive receiver, and

FIG. 3 depicts a portion of a time domain signal which corresponds to an OFDM-signal that has been obtained according to the present invention.

Claims

1. Method of coding data, wherein one or more data symbols (d0, d1, . . . ) are coded by using orthogonal frequency division multiplexing, OFDM, characterized by the following steps: using Hermite polynomials (Hn) as an orthogonal function system for said orthogonal frequency division multiplexing, whereby an OFDM-signal (S(f)) is obtained,transforming said OFDM-signal (S(f)) into the time domain thus obtaining a time domain signal (s(t)),performing a step of time division multiplexing, TDM, by combining said time domain signal (s(t)) with one or more further time domain signals (s1(t), s2(t), . . . ), whereby a TDM-signal (s′(t)) is obtained.

2. Method according to claim 1, characterized in that said OFDM-signal (S(f)) is obtained according to

3. Method according to claim 2, characterized in that said weighting function w(f) depends on a Gaussian function, in particular w(f)=e−μ2·f2.

4. Method according to claim 1, characterized in that said one or more further time domain signals (s1(t), s2(t), . . . ) are obtained by transforming corresponding OFDM-signals to the time domain.

5. Method according to claim 1, characterized in that said one or more further time domain signals (s1(t), s2(t), . . . ) comprise control data and/or reference data, in particular for controlling a transmission of said TDM-signal (s′(t)).

6. Method according to claim 1, characterized by using an inverse fast Fourier transformation, iFFT, algorithm for transforming said OFDM-signals to the time domain.

7. Method of decoding a TDM-signal (s′(t)) which has preferably been obtained by the method according to one of the preceding claims, characterized by the following steps: separating said one or more time domain signals (s(t), s1(t), s2(t), . . . ) from said TDM-signal (s′(t)),transforming at least one of said time domain signals (s(t), s1(t), s2(t), . . . ) to the frequency domain thereby recovering a corresponding OFDM-signal,applying an orthogonality condition to a recovered OFDM-signal.

8. Method according to claim 7, characterized in that said orthogonality condition is

9. Transmitter configured to perform a method of coding data, wherein one or more data symbols (d0, d1, . . . ) are coded by using orthogonal frequency division multiplexing, OFDM, characterized by the following steps: using Hermite polynomials (Hn) as an orthogonal function system for said orthogonal frequency division multiplexing, whereby an OFDM-signal (S(f)) is obtained,transforming said OFDM-signal (S(f)) into the time domain thus obtaining a time domain signal (s(t)),performing a step of time division multiplexing, TDM, by combining said time domain signal (s(t)) with one or more further time domain signals (s1(t), s2(t), . . . ), whereby a TDM-signal (s′(t)) is obtained.

10. Receiver configured to perform a method of coding data, wherein one or more data symbols (d0, d1, . . . ) are coded by using orthogonal frequency division multiplexing, OFDM, characterized by the following steps: using Hermite polynomials (Hn) as an orthogonal function system for said orthogonal frequency division multiplexing, whereby an OFDM-signal (S(f)) is obtained,transforming said OFDM-signal (S(f)) into the time domain thus obtaining a time domain signal (s(t))performing a step of time division multiplexing, TDM, by combining said time domain signal (s(t)) with one or more further time domain signals (s1(t), s2(t), . . . ), whereby a TDM-signal (s′(t)) is obtained.