Apparatus and method for transceiving data
AssigneeElectronics and Telecommunications Research Institute
InventorJong Soo Lim
Life of this patent
Estimating the term…
Abstract
A data transmitting apparatus generates a plurality of pilot signals to be used for channel estimation by a data receiving apparatus, performs symbol mapping of a plurality of input data signals and a plurality of pilot signal into a plurality of data symbols and a plurality of pilot symbols, converts input symbols in the frequency domain including the plurality of data symbols and the plurality of pilot symbols into a real signal in the time domain, and performs angle modulation of the real signal. The data transmitting apparatus controls the amplitude of the sine component of the angle-modulated real signal by a gain that varies with a control signal and then transmits the real signal.
Claims17
A data transmitting apparatus comprising:
- a pilot generator to generate at least one pilot signal to be used for channel estimation by a data receiving apparatus;
- a symbol mapper to perform symbol mapping of a plurality of data signals and at least one pilot signal into a plurality of data symbols and at least one pilot symbol;
- a real signal converter to convert input symbols in the frequency domain including the plurality of data symbols and the at least one pilot symbol into a real signal in the time domain;
- an angle modulation unit to perform angle modulation of the real signal;
- a Peak-to-Average Power Ratio (PAPR) control & power normalization unit to adjust the amplitude of the sine component of the angle-modulated real signal in accordance with a first gain, and to vary the first gain in accordance with an input signal;
- and
- a signal transmitter to convert the amplitude-adjusted real signal into a radio frequency signal and to transmit the radio frequency signal,
- wherein the angle modulation unit comprises:
- a phase controller to control the amplitude of the real signal in accordance with a second gain;
- and
- a modulator to perform angle modulation of the real signal into a cosine signal and a sine signal.
A data receiving apparatus comprising:
- a power compensator to compensate for an adjustment in the amplitude of a baseband signal corresponding to reception data, the adjustment being made by the data receiving apparatus to achieve Peak-to-Average Power Ratio control;
- an angle demodulation unit to perform angle demodulation of the baseband signal of which amplitude has been compensated for;
- a normalization and real signal de-converter to convert the angle demodulated signal from the time domain into a plurality of parallel symbols in the frequency domain by fast Fourier transform;
- a pilot extractor to extract a pilot symbol and data symbols from the parallel symbols;
- a channel estimator to perform channel estimation by using the pilot symbols;
- a channel equalizer to perform channel compensation by using an estimated channel;
- and
- a symbol demapper to perform symbol demapping of the data symbols into a plurality of data signals, whereby restoring data,
- wherein the angle demodulation unit comprises:
- a phase estimator to calculate a phase estimate of the baseband signal;
- and
- a phase compensator to compensate for the phase of the baseband signal from the phase estimate.
A data transmitting method of a data transmitting apparatus, the method comprising:
- generating a plurality of pilot signals to be used for channel estimation by a data transmitting apparatus;
- performing symbol mapping of a plurality of input signals and the plurality of pilot signals to generate a plurality of data symbols and a plurality of pilot symbols;
- converting input symbols in the frequency domain including the plurality of data symbols and the plurality of pilot symbols from the frequency domain into a real signal in the time domain;
- performing angle modulation of the real signal;
- controlling the amplitude of the sine component of the angle-modulated real signal;
- and
- converting the angle-modulated real signal into a radio frequency signal and transmitting the radio frequency signal,
- wherein the performing of angle modulation comprises:
- controlling the amplitude of the real signal in accordance with a second gain;
- and
- performing angle modulation of the real signal into a cosine signal and a sine signal.
A data receiving method of a data receiving apparatus, the method comprising:
- compensating for the amplitude of a baseband signal corresponding to reception data to achieve Peak-to-Average Power Ratio control;
- performing angle demodulation of the baseband signal of which amplitude has been compensated for;
- converting the angle demodulated signal from the time domain into a plurality of parallel symbols in the frequency domain by fast Fourier transform;
- extracting a pilot symbol and data symbols from the parallel symbols;
- performing channel estimation by using the pilot symbol;
- performing channel compensation using an estimated channel;
- and
- performing symbol demapping of the data symbols to restore the reception data,
- wherein the performing angle demodulation comprises:
- calculating a phase estimate of the baseband signal;
- and
- compensating for the phase of the baseband signal by using the phase estimate.
Dependencies are inferred from the claim text.