Combining block-coded modulation codes and improved constellation extended schemes to reduce peak-to-average power ratio in orthogonal frequency-division multiplexing systems

Orthogonal frequency-division multiplexing (OFDM) has been recommended as the standard for numerous wireless transmission systems. However, OFDM still has deficiencies that must be improved, such as a high peak-to-average power ratio (PAPR) occurring in the transmission signal. A constellation extended scheme (CES) is one technology for reducing high PAPR. The PAPR performance of the CES is directly correlated to the amount of candidate signals, high PAPR in OFDM systems will be significantly reduced as the candidate signals increase. However, because calculating the PAPR values of candidate signals requires more inverse fast Fourier transform operations, the CES hardware circuit is difficult to achieve. Therefore this study combines the CES, partial transmit sequences (PTSs) and block-coded modulation (BCM) codes to propose a BCM-CES-PTS technology, which simultaneously improves the high computation of the CES, the necessary side information delivered in PTS and the lack of error correction capabilities in the transmitted signal itself, applying this to a 16-QAM modulation OFDM system. In addition, this study proposes two structures of the CES by arranging the extended constellation points in symmetrical and asymmetrical forms, called S-BCM-CES-PTS and AS-BCM-CES-PTS, respectively. The generator matrices of the two structures were proposed to simplify the division of the circuit into sub-blocks.

[1]  Todor Cooklev,et al.  Air Interface for Fixed Broadband Wireless Access Systems , 2004 .

[2]  Chintha Tellambura,et al.  Improved phase factor computation for the PAR reduction of an OFDM signal using PTS , 2001, IEEE Communications Letters.

[3]  Shu Lin,et al.  On multilevel block modulation codes , 1991, IEEE Trans. Inf. Theory.

[4]  Ramjee Prasad,et al.  OFDM for Wireless Multimedia Communications , 1999 .

[5]  Nelson Sollenberger,et al.  Peak-to-average power ratio reduction of an OFDM signal using partial transmit sequences , 2000, IEEE Communications Letters.

[6]  J.A.C. Bingham,et al.  Multicarrier modulation for data transmission: an idea whose time has come , 1990, IEEE Communications Magazine.

[7]  Marc Engels.  Wireless OFDM Systems: How to Make Them Work? , 2002 .

[8]  Jean-Paul M. G. Linnartz,et al.  Multi-Carrier Cdma In Indoor Wireless Radio Networks , 1994 .

[9]  Chin-Liang Wang,et al.  A Low-Complexity Constellation Extension Scheme for PAPR Reduction of OFDM Signals , 2009, 2009 IEEE 70th Vehicular Technology Conference Fall.

[10]  John Terry,et al.  OFDM Wireless LANs: A Theoretical and Practical Guide , 2001 .

[11]  Andreas Antoniou,et al.  A New Peak-to-Average Power-Ratio Reduction Algorithm for OFDM Systems via Constellation Extension , 2007, IEEE Transactions on Wireless Communications.

[12]  Shu Lin,et al.  Error control coding : fundamentals and applications , 1983 .

[13]  Tao Jiang,et al.  An Overview: Peak-to-Average Power Ratio Reduction Techniques for OFDM Signals , 2008, IEEE Transactions on Broadcasting.

[14]  Chin-Liang Wang,et al.  An Improved Constellation Extension Scheme for PAPR Reduction in OFDM Systems , 2011, 2011 IEEE 73rd Vehicular Technology Conference (VTC Spring).