Iterative signal reconstruction of deliberately clipped SMT signals

作者：Kollar Zsolt^*; Gazda Juraj; Horvath Peter; Varga Lajos; Kocur Dusan

来源：Science China Information Sciences, 2014, 57(2): 022301.

DOI：10.1007/s11432-013-4921-7

• clipping
• SMT
• iterative decoding
• nonlinear distortion
• PAPR

Staggered MultiTone (SMT) is a modulation technique showing significantly reduced Adjacent Channel Leakage Ratio (ACLR) resulting in a more compact Power Spectrum Density (PSD) for the transmitted signal, than the well-known and already widely adopted Orthogonal Frequency Division Multiple Access (OFDMA) scheme. However, the unique spectral properties of an SMT signal could be degraded by a non-linear element (e.g. a Power Amplifier (PA)) in the transmitter. Deliberate baseband clipping can be applied to the transmitted signal, reducing the notable high Peak-to-Average Power Ratio (PAPR). The objective of this paper is to give a brief introduction to the SMT scheme, with a special emphasis on deliberate clipping effects and their compensation. The paper introduces two receiver-oriented iterative methods aiming at the restoration of the baseband Bit Error Rate (BER) performance of a non-clipped signal. The methods are evaluated and compared based on numerical simulations. The paper concludes with the selection of a possible candidate for use in systems applying deliberately clipped SMT signals.

• 出版日期2014-2