光OFDM技术在短距离和长途光纤通信系统中的应用研究

科学技术的发展推动了互联网的广泛应用和发展,光正交频复用(OFDM)技术具有高频率、色度色散强、偏振模色散容忍性以及高阶调制的扩展能力等的优势,基于此光OFDM技术在短距离和长途光纤通信系统中被广泛应用。本文首先就光OFDM技术进行简单介绍,然后就光OFDM技术在短距离和长途光纤通信系统中的应用进行了具体研究。

Distributed Power Control for Energy Conservation in Hybrid Cellular Network with Device-to-Device Communication

Device-to-Device(D2D) communication has been proposed as a promising implementation of green communication to benefit the existed cellular network.In order to limit cross-tier interference while explore the gain of short-range communication,we devise a series of distributed power control(DPC) schemes for energy conservation(EC)and enhancement of radio resource utilization in the hybrid system.Firstly,a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology in the presence of service requirement and power constraint.Then,biasing scheme and admission control are added to evade ineffective power consumption and maintain the feasibility of the system.Upon feasibility,a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency(SE).The convergence of the DPC schemes is validated and their performance is confirmed via simulation results.

基于中断概率和差分信道质量指示信息的头节点选择算法

针对蜂窝短距离通信系统中用户头节点的选择性问题,提出基于中断概率和差分信道质量指示信息的头节点选择算法。算法利用了指数分布的功率增益和条件概率选出中断概率较小的用户;结合了协作小区反馈的信道质量指示信息进行差分比较;选出了小区间干扰最小的用户。理论分析和仿真结果表明,算法所选用户中断概率小,且吞吐量增加。利用所提算法进行蜂窝短距离通信系统中用户头节点选择,能提升系统通信性能。