A Class of Nonlinear Signal-Processing Schemes for Bandwidth-Efficient OFDM Transmission With Low Envelope Fluctuation

Turbo multiuser detection for MC-CDMA signals with strongly nonlinear transmitters

“…1, which is based on the nonlinear signal processing schemes proposed in [14] for reducing the PMEPR of OFDM signals. It is shown in [15] that the frequency-domain block to be transmitted by the pth MT {S…”

“…This is particularly important for the uplink transmission, since an efficient, low-cost power amplification is desirable at the MT (Mobile Terminal). Several techniques have been recommended for reducing the envelope fluctuations of multicarrier signals [11]- [14]. A promising approach is to employ clipping techniques, combined with a frequency-domain filtering so as to reduce the envelope fluctuations of the transmitted signals while maintaining the spectral occupation of conventional schemes [14].…”

“…Several techniques have been recommended for reducing the envelope fluctuations of multicarrier signals [11]- [14]. A promising approach is to employ clipping techniques, combined with a frequency-domain filtering so as to reduce the envelope fluctuations of the transmitted signals while maintaining the spectral occupation of conventional schemes [14]. However, the nonlinear distortion effects can be severe when a low-PMEPR transmission is intended [14], [15].…”

“…A promising approach is to employ clipping techniques, combined with a frequency-domain filtering so as to reduce the envelope fluctuations of the transmitted signals while maintaining the spectral occupation of conventional schemes [14]. However, the nonlinear distortion effects can be severe when a low-PMEPR transmission is intended [14], [15]. To improve the performances, we can employ the receivers proposed in [16], [17] where the nonlinear distortion effects are iteratively estimated and compensated [18].…”

“…To allow an efficient power amplification, the PMEPR-reducing techniques of [14] are adopted by each MT. The BS (Base Station) has several receive antennas, so as to reduce the transmit power requirements of each MT.…”