Apparatus and method for transmitting and receiving side information of a partial transmit sequence in an ofdm communication system

Abstract

An Orthogonal Frequency Division Multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carrier frequencies, which includes a transmitter for converting a serial data stream into parallel data, and segmenting the parallel data into a plurality of blocks having a plurality of data blocks; inserting reference data having information representing a phase value and a position into which the reference symbol is inserted, into each of the segmented blocks; Inverse Fast Fourier Transform (IFFT)-transforming the respective blocks into time-based signals where sub-carrier frequencies are separately assigned to the data blocks; and determining phase factors of the IFFT-transformed time-based signals to reduce a Peak-to-Average Power Ratio (PAPR) where non-linear distortion occurs due to coincidence of phases of the data blocks IFFT-transformed with the sub-carrier frequencies, and phase-rotating the IFFT-transformed signals according to the determined phase factors before transmission.

1 . A reception apparatus for an Orthogonal Frequency Division Multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carrier frequencies before transmission, the apparatus comprising: 
 a Fast Fourier Transform (FFT) unit for FFT-transforming parallel data generated by parallel-converting a received signal;    a sub-block segmentation unit for segmenting an output of the FFT unit into a plurality of sub-blocks;    a plurality of reference symbol detectors for detecting reference symbols inserted by a transmitter, from the segmented sub-blocks;    a plurality of inverse phase rotation units for inverse phase-rotating the sub-blocks according to phase values of the detected reference symbols;    a plurality of reference symbol eliminators for eliminating the detected reference symbols from outputs of the inverse phase rotation units; and    a combiner for combining outputs of the reference symbol eliminators.    
   
   
       2 . A reception method for an Orthogonal Frequency Division Multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carrier frequencies before transmission, the method comprising the steps of: 
 Fast Fourier Transform (FFT)-transforming parallel data generated by parallel-converting a received signal;    segmenting the FFT-transformed signal into a plurality of sub-blocks;    detecting reference symbols inserted by a transmitter, from the segmented sub-blocks;    inverse phase-rotating the segmented sub-blocks according to associated phase values of the detected reference symbols;    eliminating the reference symbols from the phase-rotated sub-blocks; and    combining the reference symbol-eliminated sub-blocks.    
   
   
       3 . A reception method for an Orthogonal Frequency Division Multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carrier frequencies by parallel-converting a received signal into parallel data, Fast Fourier Transform (FFT)-transforming the parallel data, segmenting the FFT-transformed data into a plurality of sub-blocks, and inverse-phase-rotating the sub-blocks according to predetermined phase values, the reception method comprising the steps of: 
 detecting reference data having information representing a phase value and a position into which the reference data is inserted, the reference data being inserted by a transmitter into each of the blocks, between the segmentation step and the inverse-phase-rotation step; and    eliminating the reference data from each of the inverse-phase-rotated sub-blocks according to the phase value.