A novel out-of-band emission suppression method in future wireless communications employing filtered orthogonal frequency division multiplexing waveform

摘要

In order to achieve flexible configuration and asynchronous transmission ofdifferent subbands (SBs), SB filters are utilized in filtered orthogonal frequencydivision multiplexing (f-OFDM) systems to isolate different SBs efficiently.Nevertheless, the price is the insertion of some intrinsic interference.Therefore,the suppression of the out-of-band emission (OOBE) between SBs is essentialfor the system performance improvement of f-OFDM. According to the systemstructure of f-OFDM, an optimization design model based on active interferencecancelation (AIC) is proposed in this study, and the optimization designmodel is solved through second order cone programming. Furthermore, theeffectiveness of the proposed AIC algorithm in OOBE suppression is verifiedby computer simulations. To the whole system, the OOBE suppression alsomeans the decrease of inter-SB interference (ITBI). In addition, the influencesof main parameters, such as the number of the cancelation carriers (CCs), onthe OOBE suppression performance of the proposed AIC algorithm, are simulatedand analyzed. Moreover, some intrinsic characteristics of the proposedalgorithm in parameter configuration are revealed in terms of power spectraldensity (PSD) and bit error ratio (BER).