US 2001/0055296 A1 · Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type

Abstract

A signal transmission system of an OFDM using a plurality of carriers to transmit signal comprises a transmitting apparatus and a receiving apparatus. The receiving apparatus comprises an input unit for applying the OFDM signal from the transmitting apparatus; a fast Fourier transforming unit for separating the OFDM signal from the input unit into base-band signals including pilot signals; an interpolation unit for interpolating the pilot signals in a time-axis direction and a frequency-axis direction to calculate reference signal vectors of the carriers in which the pilot signals are not included; a demodulation unit for decoding to be produced as information codes; a delay a unit for adjusting a delay time of said base-band signals passing the delay unit; and a control unit coupled with the interpolation unit, for changing frequency band characteristics of the interpolation unit.

Claims16

Dependent claims

A signal transmission system of an orthogonal frequency division multiplexing using a plurality of carriers to transmit OFDM signal comprising a transmitting apparatus and a receiving apparatus, said receiving apparatus comprising;

an input unit for applying said OFDM signal from said transmitting apparatus:
a fast Fourier transforming unit coupled with said input unit, for separating said OFDM signal into base-band signals including pilot signals of respective carriers;
an interpolation unit coupled with said fast Fourier transforming unit, for interpolating said pilot signals in a time-axis direction and a frequency-axis direction to calculate reference signal vectors of said carriers in which said pilot signals are not inserted;
a demodulation unit coupled with said interpolation unit, for decoding to be produced as information codes:
a delay unit coupled with said a Fourier transforming unit and said demodulation unit, for adjusting a delay time of said base-band signals passing therethrough;
and
a control unit coupled with said interpolation unit, for changing frequency band characteristics of said interpolation unit.

4 more elements

A receiving apparatus for a signal transmission system of an orthogonal frequency division multiplexing type using a plurality of carriers orthogonal to one another to transmit information codes, said receiving apparatus receiving, signals wherein pilot signals are inserted in the carriers of a predetermined frequencies at intervals of a predetermined number of symbols in the direction of the time-axis and in the carriers at intervals of a predetermined number of carriers in the direction of the frequency-axis, and reference signal vectors utilized as the basis for demodulation being produced from the pilot signals extracted from the received signal, said receiving apparatus comprising:

an interpolation circuit for interpolating said pilot signals extracted from said received signal in said time-axis direction and said frequency-axis direction to calculate reference signal vectors of carriers in which pilot signals are not inserted;
said interpolation circuit including a time-axis direction interpolation circuit for interpolating the extracted pilot signals to produce the reference signal vectors of carriers in which said pilot signal is not inserted in the symbol having the same frequency,
said receiving apparatus further comprising circuits for changing frequency band characteristics of said time-axis direction interpolation circuit.

Dependencies are inferred from the claim text.

Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type

Life of this patent

Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type

Life of this patent

Abstract

Claims16