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Peak-to-average power ratio (PAR) reduction algorithms have been thoroughly studied for single system multicarrier signals that tend to have low power efficiency. However, an emerging application for PAR reduction, namely asynchronous multi-plexed signals, has not been examined. This paper frames the problem arising in modern base stations where multiple frequency-division OFDM waveforms are multiplexed...
OFDM signals suffer significant distortion when transmitted through practical power amplifiers. In this paper, we examine the channel estimation performance of OFDM systems under channels with such a peak power constraint. We consider the effects of null edge subcarriers added for spectral shaping and derive the Crame??r-Rao bound for channel estimation performance of this system both with pilot power...
Step size and tap length play critical roles in balancing the complexity and steady-state performance of an adaptive filter. For an impulse response with an exponential power decay profile, which models a wide range of practical systems, such as an acoustic echo path, this paper proposes a new variable step-size and tap-length least mean square (LMS) algorithm. In each iteration, the optimal step-size...
In the literature, peak-to-average power ratio (PAR) is often used as an indicator for the dynamic range of OFDM signals. PAR is an extreme value statistic and can present an overly pessimistic view of the signal. Instantaneous-to-average power ratio (IAR), on the other hand, reflects more accurately the characteristics of the sample population. In this paper, we show that depending on whether clipping...
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