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首页> 外文期刊>The mediterranean journal of electronics and communications >JOINT POWER AND RATE OPTIMIZATION IN SHARED-SPECTRUM NETWORKS
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JOINT POWER AND RATE OPTIMIZATION IN SHARED-SPECTRUM NETWORKS

机译：共享频谱网络中的联合功率和费率优化

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摘要

An optimal radio resource allocation algorithm that incorporates joint adaptation of transmission power and rate to the time-varying multi-user interference (MUI) and multipath fading channel conditions is proposed towards enhancing the average spectral efficiency (ASE) of the cognitive users (CUs) in shared-spectrum code division multiple access (CDMA) systems. We consider the scenario in which CUs exploit the licensed spectrum subject to obeying the prescribed average and peak received-interference constraints at the primary service receiver. Further, we solve the optimization problem for a scenario where the maximum tolerable received-interference is set dynamically according to the number of active primary and cognitive users that exploit the primary frequency band. The optimum outer-loop power control (OLPC) target signal-to-interference-plus-noise ratio (SINR-target) and the corresponding variable spreading factor (VSF) of a reference cognitive user (RCU) are derived under Nakagami-m frequency-selective fading channels with coherent maximum ratio combining (MRC) RAKE receiver. Results indicate that the proposed algorithm achieves an optimal trade-off between higher ASE of the CUs and preserving the QoS of the primary users. Further, by incorporating our adaptive transmission technique the RCU' ASE is significantly improved in low SINR regions, compared to the state-of-the-art schemes with conventional rate and power control.
机译：提出了一种结合时变多用户干扰（MUI）和多径衰落信道条件的传输功率和速率联合自适应的最佳无线电资源分配算法，以提高认知用户（CU）的平均频谱效率（ASE）在共享频谱码分多址（CDMA）系统中。我们考虑了CU在遵守主要服务接收器规定的平均和峰值接收干扰约束条件的情况下利用CU许可频谱的情况。此外，我们针对根据可利用主要频段的活跃主要用户和认知用户的数量动态设置最大可容忍接收干扰的情况，解决了优化问题。在Nakagami-m频率下得出最佳外环功率控制（OLPC）目标信干噪比（SINR-target）和参考认知用户（RCU）的相应变量扩展因子（VSF）具有相干最大比率合并（MRC）RAKE接收器的选择性衰落信道。结果表明，该算法在较高的CU ASE与保留主要用户QoS之间实现了最佳折衷。此外，与采用常规速率和功率控制的最新方案相比，通过采用我们的自适应传输技术，RCU'ASE在低SINR区域得到了显着改善。

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