||The OFDM system is a new modulation scheme. It usually use for high speed data transmission, especially on Ricean fading channel, to overcome intersymbol interference. However, this new transmission scheme has a large peak-to-average power ratio (PAPR), which can result in significant distortion when transmission through a nonlinear power amplifier. Parallel Combinatory OFDM system (PC-OFDM) is a new scheme which has lower peak-to-average power ratio, higher bandwidth efficiency, and lower bit error probability. Although, the PC-OFDM system can effectively lower PAPR, the bit errors mainly result from erroneously selected subcarriers. This paper proposed a new scheme, which can effectively improve the performance of PC-OFDM, called CPC-OFDM. The CPC-OFDM system uses two stage modulations to achieve the goal of decreasing BEP. In the first stage, CPC-OFDM system use block coding on the PC-bits which decide the type of subcarriers. In the second stage, it uses ordinary PC-OFDM for transmission. The scheme improves not only bandwidth efficiency but also power efficiency.|
|| J. A. C. Bingham, “Multicarrier modulation for data transmission: An idea whose time has come,” IEEE Trans. Commun., vol. 28, pp. 5–14, May 1990.|
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