Apparatus and method for transmitting data using a plurality of carriers
A data transmitting and receiving method of transmitting supplementary data in an OFDM communication system is disclosed. The method of transmitting and receiving the OFDM signal includes: mapping an input bit stream into at least one transfer symbol; changing at least one of amplitudes and phases of the transfer symbols that are transmitted by a specific sub-carrier group having a plurality of sub-carriers using constellation modification information to indicate specific additional data; and transmitting the transfer symbols, to which the changing is carried out, to a receiving end by an orthogonal frequency division multiplexing data processing, the constellation modification information being identical to each other with respect to the transfer symbols that are transmitted by the specific sub-carrier group.
1. A method of transmitting signals to a receiver by a transmitter, the method comprising:
transmitting a time domain signal to the receiver,
wherein:
at least one first information bit is modulated, resulting in at least one first modulated symbol;
at least one second information bit is modulated, resulting in at least one second modulated symbol;
the at least one second modulated symbol, which is a result of the modulation of the at least one second information bit, is multiplied by a third information bit sequence; and
the time domain signal is generated from the at least one first modulated symbol, which is not multiplied by the third information bit sequence, and the at least one second modulated symbol which is multiplied by the third information bit sequence.
2. The method of claim 1 , wherein the at least one second information bit and the third information bit sequence comprise pilot information and additional information other than user data.
3. The method of claim 1 , wherein the modulating of the at least one first information bit and the modulating of the at least one second information bit comprise a binary phase shift keying (BPSK), a quadrature phase shift keying (QPSK), a M-ary phase shift keying (PSK) and a M-ary quadrature amplitude modulation (QAM).
4. The method of claim 1 , wherein the transmitter uses a transmission scheme to reduce a Peak-To-Average Power Ratio (PAPR) of the time domain signal when transmitting the time domain signal to the receiver.
5. The method of claim 4 , wherein the transmission scheme comprises a single carrier frequency division multiple access (SC-FDMA) transmission scheme.
6. The method of claim 1 , wherein the transmitter is a mobile terminal.
7. An apparatus for transmitting signals to a receiver, the apparatus comprising:
a transmitter configured to transmit a time domain signal to the receiver,
wherein:
at least one first information bit is modulated, resulting in at least one first modulated symbol;
at least one second information bit is modulated, resulting in at least one second modulated symbol;
the at least one second modulated symbol, which is a result of the modulation of the at least one second information bit, is multiplied by a third information bit sequence; and
the time domain signal is generated from the at least one first modulated symbol, which is not multiplied by the third information bit sequence, and the at least one second modulated symbol which is multiplied by the third information bit sequence.
8. The apparatus of claim 7 , wherein the at least one second information bit and the third information bit sequence comprise pilot information and additional information other than user data.
9. The apparatus of claim 7 , wherein the modulating of the at least one first information bit and the modulating of the at least one second information bit comprise a binary phase shift keying (BPSK), a quadrature phase shift keying (QPSK), a M-ary phase shift keying (PSK) and a M-ary quadrature amplitude modulation (QAM).
10. The apparatus of claim 7 , wherein the transmitter is further configured to use a transmission scheme to reduce a Peak-To-Average Power Ratio (PAPR) of the time domain signal when transmitting the time domain signal to the receiver.
11. The apparatus of claim 10 , wherein the transmission scheme comprises a single carrier frequency division multiple access (SC-FDMA) transmission scheme.
12. The apparatus of claim 7 , wherein the transmitter is a mobile terminal.