US 2007/0165733 A1 · RECEPTION APPARATUS

Abstract

A reception apparatus includes a plurality of antennas for receiving modulation signals of channels in the same frequency band, an received signal strength intensity estimation unit for estimating the reception received signal strength intensity of each reception signal, transmission path fluctuation estimation units for estimating a transmission path fluctuation of each channel of the reception signal, phase difference estimation units for calculating a phase difference of the transmission path fluctuation estimation signal of a predetermined channel of each antenna and outputting it as a phase difference signal, and a signal selection unit for selecting and outputting a reception quadrate baseband signal for isolating a signal of each channel from the reception signals and a transmission path fluctuation estimation signal of each channel. Thus, by isolating and demodulating a plurality of muliplexed modulated signals received, it is possible to improve the data transmission rate.

Claims12

Dependent claims

A method of transmitting a first OFDM modulation signal and a second OFDM modulation signal in an identical frequency band from a plurality of antennas,

wherein the method comprises:
at a first time,
inserting a demodulation symbol to a first sub-carrier of the first OFDM modulation signal;
inserting a signal where both of an identical phase signal and a quadrature signal in an in-phase-quadrature plane are made to be zero to the first sub-carrier of the second OFDM modulation signal;
inserting the demodulation symbol to a second sub-carrier of the second OFDM modulation signal;
and
inserting the signal where both of the identical phase signal and the quadrature signal in the in-phase-quadrature plane are made to be zero to the second sub-carrier of the first OFDM modulation signal.

4 more elements

A transmission apparatus comprising:

a plurality of antennas which transmit a first OFDM modulation signal and a second OFDM modulation signal in an identical frequency band;
a frame structure signal generator for generating a frame structure signal representing a structure of a transmitting frame, the transmitting frame where
a demodulation symbol is inserted to a first sub-carrier of the first OFDM modulation signal;
a signal where both of an identical phase signal and a quadrature signal in an in-phase-quadrature plane are made to be zero is inserted to the first sub-carrier of the second OFDM modulation signal;
the demodulation symbol is inserted to a second sub-carrier of the second OFDM modulation signal;
and
the signal where both of the identical phase signal and the quadrature signal in the in-phase-quadrature plane are made to be zero is inserted to the second sub-carrier of the first OFDM modulation signal at a first time;
a plurality of OFDM transformers for transforming a transmitting signal inserted the demodulation symbol to a OFDM signal based on the frame structure signal and outputting the OFDM signal to the plurality of antennas.

5 more elements

Dependencies are inferred from the claim text.

Reception apparatus

Life of this patent

Reception apparatus

Life of this patent

Abstract

Claims12