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An Efficient Multiple Access Scheme for Dynamic Subband Allocation in OFDMA System

机译:OFDMA系统中动态子带分配的高效多址方案

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摘要

Dynamic subcarrier allocation is a promising technique to improve signal quality and system capacity of OFDMA system, especially in frequency selective radio channels. We focus on dynamic subband allocation in OFDMA system because of the low signaling overhead, low complexity of multiuser receiver, and good multiple access interference (MAI) performance. In this paper, we propose an efficient centralized control scheme in multiple access protocol to resolve collision of subband application among multiple asynchronous users. Subband handover is employed in the multiple access protocol to track changes of frequency selectivity of radio channel. Simulation results show that the scheme effectively improves the performance of average bit error rate (BER) of multiple users and system capacity. The improved dynamic subband allocation scheme improves the system performance and ensures reliable communications over asynchronous frequency-selective multiple user channel.
机译:动态副载波分配是一种改善OFDMA系统信号质量和系统容量的有前途的技术,尤其是在频率选择性无线电信道中。由于信令开销低,多用户接收器的复杂度低以及良好的多址干扰(MAI)性能,我们将重点放在OFDMA系统中的动态子带分配上。本文提出了一种有效的集中访问控制方案,解决了多个异步用户之间的子带应用冲突。在多址访问协议中采用子带切换来跟踪无线电信道的频率选择性的变化。仿真结果表明,该方案有效提高了多个用户的平均误码率和系统容量。改进的动态子带分配方案提高了系统性能,并确保通过异步频率选择性多用户信道进行可靠的通信。

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