Dynamic Spectral Shaping for OFDM with Low Complexity

This paper addresses the critical problem of spectral confinement in OFDM systems, crucial for cognitive radio applications. The proposed method offers a low-complexity solution for dynamically adapting the power spectral density (PSD) of OFDM signals to non-contiguous and time-varying spectrum availability. The use of preoptimized pulses, combined with active interference cancellation (AIC) and adaptive symbol transition (AST), allows for online adaptation without resorting to computationally expensive optimization techniques. This is a significant contribution, as it provides a practical approach to improve spectral efficiency and facilitate the use of cognitive radio.

• •Proposes a low-complexity method for spectral shaping of OFDM signals.
• •Enables dynamic adaptation to changes in spectrum availability.
• •Utilizes preoptimized pulses with AIC and AST.
• •Avoids computationally expensive optimization problems.
• •Improves spectral efficiency and supports cognitive radio.