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Energy and delay constrained scheduling of real time traffic over OFDM communication system with non-causal channel information

机译：具有非因果信道信息的OFDM通信系统上实时通信的能量和延迟约束调度

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摘要

A point to point wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM) is considered, wherein R bits of information have to be scheduled within a hard delay deadline of T time slots over a frequency selective slow fading channel. The scheduling objective is to minimize the energy expenditure with non-causal knowledge of channel state over a limited time horizon, number of bits to be served and delay constraints. We assume a convex monomial energy-bit cost function and propose novel efficient two stage heuristic algorithm that allocate the R bits on the time slots, followed by greedy optimal bit loading over the OFDM subcarriers. An analytical model is developed and numerical simulations are performed to validate the proposed approach as well as the results show that our algorithms outperform existing approaches in published literature by up to 10 dB in power margin on an average in high load conditions while meeting the deadline of T timeslots.
机译：考虑了基于正交频分复用（OFDM）的点对点无线通信系统，其中必须在频率选择性慢衰落信道上的T个时隙的硬延迟期限内调度R个信息比特。调度目标是通过在有限的时间范围内无因果地了解信道状态，要服务的比特数和延迟约束来最小化能量消耗。我们假设凸单项式能量位代价函数，并提出一种新颖的高效两阶段启发式算法，该算法在时隙上分配R位，然后在OFDM子载波上进行贪婪的最优位加载。开发了一个分析模型，并进行了数值模拟，以验证所提出的方法，结果表明，在高负载条件下，我们的算法在高负载条件下的平均功率裕度平均比传统文献高出10 dB，同时又能满足截止日期的要求。 T个时隙。

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