In this paper, an adaptive radio resource allocation (RRA) algorithm applying to multiple traffic OFDMA system is proposed, which distributes sub-carrier and loading bits among users according to their different QoS requirements and traffic class. By classifying and prioritizing the users based on their traffic characteristic and ensuring resource for higher priority users, the scheme decreases...

Throughput performance and geographical service fairness of best effort service used for downlink of a 802.16e based TDD-OFDMA sectored cellular networks are evaluated in conjunction with different scheduling schemes and frequency reuse plans. The OFDM systems are based on two multiple access schemes, which are the OFDM-TDM and OFDMA, and considered scheduling schemes are round robin, max C/I, ...

Multicarrier transmission systems with a specific subcarrier allocation such as equidistantly interleaved OFDMA or Interleaved Frequency Division Multiple Access (IFDMA) are promising candidates for future mobile radio systems, because they provide many advantages such as high flexibility, good performance and low computational complexity. In this paper, a new method for accommodation of differ...

Multiple users TDS-OFDMA has been proposed based on time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM). This multiple access schemes used mostly in mobile broadband wireless access scheme in uplink transmission due to the multiple user interference in timing offset and frequency offset problems. In this paper we are focusing on timing synchronization and channel estim...

This paper addresses the tradeoff issues in OFDMA uplink data channel design. For fixed and portable applications where the propagation channels are near static, we show that maximum throughput can be achieved through intelligent channel allocation when uplink channels are configured with minimum frequency diversity. The total uplink throughput under different configurations is presented. For m...

In this paper, we consider a downlink packet scheduling algorithm in OFDMA systems for mixed traffics, such as real-time (RT) and non-real-time (NRT) services. The scheduling algorithm we proposed bases on the Utility Function and the Barrier Function, taking into account the Head-Of-Line (HOL) packet delay and Packet Drop Ratio (PDR) for video streaming. Simulation results show that our new al...

Abstract— Most cellular standards for the forthcoming beyond 3G (B3G) and 4G technologies state Orthogonal FrequencyDivision Multiple Access (OFDMA) as the preferred multiplexing technique. OFDMA combines an efficient multiple access with Adaptive Quadrature Amplitude Modulation (AQAM) to maximize system performance while keeping the errors below a certain target. In order to achieve this objec...

In this paper, we develop a green handover protocol in two-tier OFDMA macrocell-femtocell networks. To improve the energy efficiency of femtocell base station, the proposed green handover protocol can intelligently switch on its radio communication and associated processing, or called as “wake up” from the idle mode, if the remainder data of a mobile host can be completely uploaded through the ...

The authors present a performance analysis of orthogonal frequency division multiple access (OFDMA) based cellular systems with dynamic packet assignment (DPA). Most approaches in the current literature for analysing wireless data networks do not take into account the interference conditions on the radio channel. An analytical model based on a two-dimensional continuous-timeMarkov chain (CTMC),...