Abstract
Spectrum sharing and multiple-access techniques are challenging matters for future wireless communication systems. Orthogonal frequency division multiplexing (OFDM) has been considered as the most important physical layer candidate for the next generation wireless systems. Alternatively, multiband OFDM (MB-OFDM) approach has shown some novelty and efficiency for high-rate (HR) WPAN applications and so has been selected for future HR ultra wideband (UWB) systems. Based on an optimization problem formulation, we jointly consider resource allocation and scheduling to define a novel dynamic timefrequency spectrum sharing mechanism based on the MB-OFDM approach. Viewed as a cross-layer solution, the proposed MB-OFDM multiple-access (MB-OFDM-MA) scheme can achieve an efficient multiuser spectrum sharing under QoS constraints. While the optimization formulation results in a high-complexity time-frequency sharing solution, we propose a low-complexity suboptimal solution able to jointly provide fairness provision with the QoS support. Compared with traditional orthogonal frequency divisionmultiple access (OFDMA), the simple time-frequency MB-OFDM-MA approach ensures a high level of fairness among the users while satisfying high-priority users having strict QoS requirements.
Highlights
Orthogonal frequency division multiplexing (OFDM) is a powerful scheme that is slated to be employed in the generation wireless systems such as Long-Term Evolution (LTE), Worldwide Interoperability for Microwave Access (WiMAX), and high-speed WLAN standards such as 802.11n
We compare the performance of the proposed multiband OFDM (MB-OFDM)-MA solution to the orthogonal frequency division multiple access (OFDMA) scheme as well as to the single-user WiMedia solution
We have proposed a novel spectrum sharing scheme based on a cross-layer MB-OFDM-MA approach
Summary
Orthogonal frequency division multiplexing (OFDM) is a powerful scheme that is slated to be employed in the generation wireless systems such as Long-Term Evolution (LTE), Worldwide Interoperability for Microwave Access (WiMAX), and high-speed WLAN standards such as 802.11n. The spectrum sharing issue is addressed either as a resource allocation problem using optimization strategies or as a time scheduling problem. Several studies investigate adaptive resource allocation for OFDMA systems using constrained optimization techniques [2,3,4]. The studies that deal with scheduling in the time domain do not consider physical layer issues [5]. In [6], scheduling algorithms are developed for IEEE802.16d OFDMA-based broadband wireless access systems. In these algorithms, radio resource is dynamically shared by the users in both time and frequency domains. The authors in [7] define a joint resource allocation and scheduling scheme for IEEE 802.16 systems but without investigating optimization issues
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