ML estimation of time and frequency offset in OFDM systems
IEEE Transactions on Signal Processing
Beyond 3G: wideband wireless data access based on OFDM and dynamic packet assignment
IEEE Communications Magazine
A MAC protocol for a wireless LAN based on OFDM-CDMA
IEEE Communications Magazine
Broadband wireless access solutions based on OFDM access in IEEE 802.16
IEEE Communications Magazine
IEEE Communications Magazine
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
IEEE Journal on Selected Areas in Communications
A fair opportunistic access scheme for multiuser OFDM wireless networks
EURASIP Journal on Wireless Communications and Networking - Special issue on fairness in radio resource management for wireless networks
OFDMA-based medium access control for next-generation WLANs
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
A new MAC protocol with collision resolution for OFDMA wireless mesh networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
An OFDM based MAC protocol for underwater acoustic networks
Proceedings of the Fifth ACM International Workshop on UnderWater Networks
Probabilistic coexistence and throughput of cognitive dual-polarized networks
EURASIP Journal on Wireless Communications and Networking - Special issue on dynamic spectrum access: from the concept to the implementation
Comparison study of resource allocation strategies for OFDM multimedia networks
Journal of Electrical and Computer Engineering - Special issue on Resource Allocation in Communications and Computing
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Orthogonal frequency division multiplexing (OFDM) is an important technique to support high speed transmission of broadband traffic in wireless networks, especially broadband wireless local area networks (LANs). Based on OFDM, a new multiple access scheme, called OFDM-TDMA with subcarrier allocation (OFDM-TDMA/SA), is proposed in this paper. It provides more flexibility in resource allocation than other multiple access schemes such as OFDM-TDMA, OFDM-frequency division multiple access (OFDM-FDMA), and orthogonal frequency division multiple access (OFDMA). With OFDM-TDMA/SA, a medium access control (MAC) is designed for broad-band wireless LANs. It optimizes bit allocation in subcarriers so that maximum bits are transmitted in each OFDM symbol under a frequency selective fading environment. The OFDM-TDMA/SA MAC protocol also supports three classes of traffic such as guaranteed, controlled-load, and best effort services. Based on the optimum subcarrier bit-allocation algorithm and considering heterogeneous QoS constraints of multimedia traffic, a hierarchical scheduling scheme is proposed to determine the subcarriers and time slots in which a mobile terminal can transmit packets. In such a way, the OFDM-TDMA/SA MAC protocol significantly increases system throughput in a frequency selective fading environment and guarantees QoS of multimedia traffic. Computer simulation is carried out to evaluate the performance of the OFDM-TDMA/SA MAC protocol. Results show that the new MAC protocol outperforms other MAC protocols for OFDM-based wireless LANs.