METHOD OF AND APPARATUS FOR REDUCING PAPR IN FILTER-BANK MULTI-CARRIER SYSTEM

1 . A method of reducing Peak-to-Average Power Ratio in a transmitting device of a filter-bank multi-carrier system, comprising:

performing constellation modulation on data to be transmitted;

performing K-point Discrete Fourier Transform on a vector composed of K constellation symbols resulting from the constellation modulation; and

performing Offset-Quadrature Amplitude Modulation on a data vector resulting from the Discrete Fourier Transform,

wherein the parameter K represents the number of subcarriers allocated for transmission of the data to be transmitted.

2 . The method according to claim 1 , wherein performing Offset-Quadrature Amplitude Modulation on a data vector resulting from the Discrete Fourier Transform comprises mapping a real part of the data vector to a first filter-bank multi-carrier symbol and mapping an imaginary part of the data vector to a second filter-bank multi-carrier symbol.

3 . The method according to claim 2 , wherein a phase comprised in each element of the first and the second filter-bank multi-carrier symbols is determined by a time-domain index of the filter-bank multi-carrier symbol to which the element belongs and a frequency-domain index of a corresponding subcarrier.

4 . The method according to claim 1 , wherein the constellation modulation in performing constellation modulation on data to be transmitted is Multiple Phase-Shift Keying or Quadrature Amplitude Modulation.

5 . The method according to claim 1 , wherein after performing Offset-Quadrature Amplitude Modulation on a data vector resulting from the Discrete Fourier Transform, the method further comprises:

mapping filter-bank multi-carrier symbols onto the allocated K subcarriers through subcarrier mapping; and

performing multi-carrier filtering on an output of the subcarrier mapping.

6 . The method according to claim 1 , wherein the allocated K subcarriers are successive.

7 . The method according to claim 5 , wherein performing multi-carrier filtering on an output of the subcarrier mapping comprises:

performing M-point Inverse Discrete Fourier Transform on the output of the subcarrier mapping; and

performing a polyphase filtering process on the signal after the Inverse Discrete Fourier Transform,

wherein the parameter M represents the total number of subcarriers in the filter-bank multi-carrier system.

8 . The method according to claim 1 , wherein before performing constellation modulation on data to be transmitted, the method further comprises:

performing channel encoding on the data to be transmitted.

9 . A method of reducing Peak-to-Average Power Ratio in a receiving device of a filter-bank multi-carrier system, comprising:

performing Offset-Quadrature Amplitude Modulation demodulation on a signal after channel equalization;

performing K-point Inverse Discrete Fourier Transform on the signal after the Offset-Quadrature Amplitude Modulation demodulation; and

performing constellation modulation demodulation on the signal after the Inverse Discrete Fourier Transform,

wherein the parameter K represents the number of subcarriers allocated for transmission of corresponding data to be transmitted.

10 . The method according to claim 9 , wherein before performing K-point Inverse Discrete Fourier Transform on the signal after the Offset-Quadrature Amplitude Modulation demodulation, the method further comprises:

performing multi-carrier filtering on a received signal;

performing subcarrier inverse mapping on the signal after the multi-carrier filtering; and

performing the channel equalization on the signal after the subcarrier inverse mapping.

11 . The method according to claim 10 , wherein performing multi-carrier filtering on a received signal comprises:

performing polyphase filtering on the received signal; and

performing M-point Discrete Fourier Transform on the signal after the polyphase filtering,

wherein the parameter M represents the total number of subcarriers in the filter-bank multi-carrier system.

12 . The method according to claim 9 , wherein the constellation modulation in performing constellation modulation demodulation on the signal after the Inverse Discrete Fourier Transform is Multiple Phase-Shift Keying or Quadrature Amplitude Modulation.

13 . The method according to claim 9 , wherein after performing constellation modulation demodulation on the signal after the Inverse Discrete Fourier Transform, the method further comprises:

performing channel decoding on the signal after the constellation modulation demodulation.

14 . An apparatus for reducing Peak-to-Average Power Ratio in a transmitting device of a filter-bank multi-carrier system, comprising:

a constellation modulation device configured to perform constellation modulation on data to be transmitted;

a Discrete Fourier Transform device configured to perform K-point Discrete Fourier Transform on a vector composed of K constellation symbols resulting from the constellation modulation; and

an Offset-Quadrature Amplitude Modulation device configured to perform Offset-Quadrature Amplitude Modulation on a data vector resulting from the Discrete Fourier Transform,

wherein the parameter K represents the number of subcarriers allocated for transmission of the data to be transmitted.

15 . An apparatus for reducing Peak-to-Average Power Ratio in a receiving device of a filter-bank multi-carrier system, comprising:

an Offset-Quadrature Amplitude Modulation demodulation device configured to perform Offset-Quadrature Amplitude Modulation demodulation on a signal after channel equalization;

an Inverse Discrete Fourier Transform device configured to perform K-point Inverse Discrete Fourier Transform on the signal after the Offset-Quadrature Amplitude Modulation demodulation; and

a constellation modulation demodulation device configured to perform constellation modulation demodulation on the signal after the Inverse Discrete Fourier Transform,

wherein the parameter K represents the number of subcarriers allocated for transmission of corresponding data to be transmitted.