Peak power reduction in MIMO OFDM via active channel extension

PAPR reduction of space-frequency coded OFDM systems using Active Constellation Extension

“…Multiple antenna OFDM systems also suffer from high PAPR problem. The ACE and the SLM methods have been extended to spatial multiplexing OFDM systems in [21] and [22], respectively. In [23], Polyphase Interleaving and Inversion (PII) which is a derivation of SLM method has been proposed for PAPR reduction of SFBC-OFDM systems.…”

Peak-to-Average Power Ratio Reduction in MIMO-OFDM with Trellis Exploration Algorithm

“…However, peak-to-average power ratio (PAPR) is a significant drawback in multi-carrier systems such as OFDM. In [3], [4] and [5], the PAPR problem in MIMO-OFDM has been addressed. However, in precoded MIMO-OFDM, the PAPR performance is even worse relative to traditional MIMO-OFDM without precoding as each transmit signal is now a composite signal due to spatial processing.…”

A novel simplified tone reservation combined with cross antenna rotation and inversion to reduce PAPR for MIMO‐OFDM system

“…Meanwhile, more attention has been paid to the PAPR reduction of MIMO‐OFDM systems recently. Some methods have been studied, such as selective mapping 17, unitary rotations 18, active channel extension 19, polyphase interleaving and inversion 20 and repeating use Chu sequences 21. Cross antenna rotation and inversion (CARI) 22 is an effective method to reduce the PAPR of MIMO‐OFDM system, which is based on exploiting the new degree of freedoms in MIMO‐OFDM system, i.e., spatial degree of freedom among different antennas.…”