NC-OFDM Transceiver Design for Maritime Cognitive Radio

Wael, Chaeriah Bin Ali; Armi, Nasrullah; Miftahushudur, Tajul; Amrullah, Yahya Syukri; Sariningrum, Ros

doi:10.1109/icramet.2018.8683927

Cited by 3 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of them, noncontiguous OFDM (NC-OFDM), can be regarded as OFDM with spectrum sensing-based cognitive radio (CR). NC-OFDM enables a secondary user (SU) to employ unoccupied subcarriers belonging to the primary user (PU), thus enhancing the SUE [7]. Since NC-OFDM could be operated over noncontiguous frequency bands, this system is a flexible choice for SU to cooperate with the primary system; it is suitable for future wireless communication [8].…”

Section: Introductionmentioning

confidence: 99%

Joint PAPR and OBP Reduction for NC-OFDM Systems

Wang,

Ueng,

Yeh

2023

IEEE Open J. Signal Process.

View full text Add to dashboard Cite

The spectrum resource is always a critical issue for wireless communications since it directly impacts the data rate and capacity. However, the problem of spectrum resource scarcity always exists. Moreover, spectrum resource scarcity becomes more severe as new communication technologies and wireless applications sprout. Noncontiguous orthogonal frequency division multiplexing (NC-OFDM) is a multicarrier method for bandwidth utilization. Unfortunately, this system has two fatal defects: high peak-to-average power ratio (PAPR) and considerable out-of-band power (OBP), which are detrimental to the system's performance. To solve these two problems, we propose a convex optimization-based method for joint PAPR and OBP reduction in NC-OFDM Systems. The strategy is to permit the secondary user to utilize the unoccupied spectrum of the primary user with dynamic spectrum sharing (DSS) based on a cognitive radio network (CRN). To this end, a flexible system operating over noncontiguous bands and DSS scenarios is necessary. The simulation results have shown that our method could effectively improve the overall performance and outperform other schemes, i.e., projections onto convex sets (POCS) and alternating projections onto convex and nonconvex sets (APOCNCS), without harming the transmission of the primary system. The collaboration between secondary and primary systems is viable with the proposed method.

show abstract

Section: Introductionmentioning

confidence: 99%