OFDM for Wireless Multimedia Communications
OFDM for Wireless Multimedia Communications
Improved algorithms for cancellation carrier optimization to suppress the OFDM OOB spectrum
IEEE Communications Letters
Sidelobe suppression in NC-OFDM systems using constellation adjustment
IEEE Communications Letters
Computers and Electrical Engineering
Revisiting active cancellation carriers for shaping the spectrum of OFDM-based cognitive radios
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Wavelet-based spectral shaping of UWB radio signal for multisystem coexistence
Computers and Electrical Engineering
Emerging cognitive radio technology: Principles, challenges and opportunities
Computers and Electrical Engineering
Cosine modulated and offset QAM filter bank multicarrier techniques: a continuous-time prospect
EURASIP Journal on Advances in Signal Processing - Special issue on filter banks for next-generation multicarrier wireless communications
IEEE Transactions on Circuits and Systems Part I: Regular Papers
A Square-Root Nyquist (M) Filter Design for Digital Communication Systems
IEEE Transactions on Signal Processing
Spectral efficiency of cognitive radio networks under interference constraint and QoS guarantees
Computers and Electrical Engineering
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
IEEE Communications Magazine
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User coexistence in physical layer of OFDM-based cognitive radio is provided by employing out-of-band (OOB) power suppression methods at the cost of large computational complexity which is prohibitive in physical layers with mega bits per second data rate. This paper proposes three new coding techniques to mitigate the OOB radiation of an OFDM system with high order modulation schemes, without introducing much complexity or transmission of side information, at the cost of small system throughput degradation compared to other existing methods. In these methods, a few subcarriers at the edge of the signal spectrum that have main contribution in OOB radiation are coded such that either modulate with minimum signal magnitude of the constellation or cancel out the OOB radiation of their adjacent subcarrier. With these methods, up to 11.5dB OOB suppression is achieved at the maximum costs of 40% system throughput reduction, and 1.2dB peak to average power ratio (PAPR) augmentation, when coding is applied to the 40% of total subcarriers at each edge of the signal spectrum.