Investigation of Pilot-based Compensation Scheme for Signal Distortion with Hexagonal Constellation

Quadrature Amplitude Modulation (QAM) has been applied to achieve the high data transmission as one of multilevel modulation schemes. In 16-QAM scheme, high Peak-toAverage Ratio (PAPR) becomes a big problem since the devices of wireless communication are required to be small and achieve the high power efficiency. To solve this problem, hexagonal constellation symbol mapping has been proposed to reduce the PAPR. On the real propagation environment, Orthogonal Frequency Division Multiplexing (OFDM) system which is used to various standards is very sensitive to signal distortion such as multipath channel and frequency offset. When the pilot signals are used to compensate the signal distortion, the combination of pilot signals and the mapping need to be considered. In this paper, a signal compensation scheme with hexagonal constellation is studied and Bit Error Rate (BER) are evaluated with computer simulation.