cdma1x无线子系统导频信道功率分配分析

分析了目前联通CDMA网络建设中的主要问题之一——导频功率分配问题。主要介绍了cdma 1x系统的信道类型，以及前向链路信道功率分配原则，并且对导频信道功率与无线网络覆盖和容量之间的关系进行了初步探讨。     

cdma2000 1x前向功率分配分析

本文提出了一种在多径传输约束条件及不同的移动台运动速度条件下对前向信道链路进行功率分配的方法,这是根据导频信道和业务信道之间各自信号强度的相关性合理地分配前向链路中的信道发射功率.通过实验测试及理论推导,本文给出了这种相关性曲线,从而发现了最佳的导频信道功率,它能够在满足1%FER时使总发射功率最小.     

cdma2000-1x中共享补充信道方式的研究与实现

本文首先基于补充信道分配方法和 cdma2 0 0 0 1 x高速分组数据业务吞吐量的关系 ,分析了共享补充信道方式的必要性。然后 ,针对其实现过程中所要涉及到的几个关键问题——补充信道的活动集切换、分组数据调度算法、功控模式和系统的帧偏移分配等进行了讨论 ,并分别提供了相应的解决方案     

cdma2000 1x反向链路特性分析

本文首先介绍了作为第三代移动通信技术的cdma2000 1x应用发展情况，然后详细分析了cdma2000 1x的反向链路结构，包括反向导频信道、反向接入过程以及反向业务信道的组成，并讨论了cdma2000 1x反向信道相对于cdmaone在技术上的改进。     

cdma2000 1x系统前向链路功率控制技术研究

本文对cdma2000 1x系统中的前向链路功率控制算法进行了研究,重点分析了软切换状态下快速功控的同步问题,并探讨了高速分组数据业务的功率控制策略。文中的研究结果应用到cdma2000 1x系统的开发和设计中,能够大大提高系统的性能。     

cdma2000 1x前向链路特性分析

首先介绍了作为第三代移动通信技术的cdma20001x的一些优点，然后详细地分析了cdma20001x的前向链路信道结构和特性，包括前向公共信道部分和前向专用信道部分，并讨论了cdma20001x相对于IS－95在前向信道的结构和技术方面的改进。     

1xEV-DO前向链路分析

本文首先介绍了作为cdma2000 1x的增强型1xEV-DO的一些优点，然后详细地分析了1xEV-DO的前向链路结构，包括前向导频信道、前向MAC信道、业务信道以及控制信道，并讨论了1xEV-DO相对于IS－95／1X在前向信链路结构和技术上的改进。     

OFDM系统频率选择性信道功率分配方案

自适应分配技术根据子信道的瞬时估计值动态地分配传输比特数和发送功率,可以优化正交频分复用（OFDM,Orthogonal Frequency Division Multiplex）系统的整体性能。这里讨论了基于容量优化的自适应比特分配算法,基于误比特率优化的最佳功率分配算法和次佳功率分配算法。仿真结果表明,对不同信道环境下三种算法的特点和性能进行了分析和比较。仿真结果表明,自适应分配技术可以优化系统的容量和误比特率。     

同频异构femtocell联合子信道和功率分配算法

摘要：针对macro-femto同频融合网络中基于资源分配的干扰抑制问题,提出一种联合子信道和功率分配算法来抑制同频干扰。该算法通过对MU进行功率控制并采用跨层切换消除同频跨层干扰,对FU进行联合信道和功率分配消除同频层内干扰;跨层切换问题是在每一层网络目标中断概率约束下通过优化网络吞吐量实现,而基于联合信道和功率分配的同频干扰抑制问题是在切换MU的目标数据速率和其他MU以及FU干扰门限约束下,通过优化FU的和速率实现。理论分析和仿真结果表明,该算法能够提高FU的和速率,增大femtocell的网络容量,并可增加femtocell的部署数目。     

浅析CDMA2000 1x系统的前向功率过载问题

文章介绍了CDMA2000 1x系统前向功率的重要性，分析了系统前向覆盖与系统容量之间的关系，讨论了影响前向链路各信道功率分配的因素及功率分配原则，重点探讨了如何缓解系统前向功率过载的问题。     

衰落余量对cdma2000 1x前向链路发射功率和容量的影响

衰落余量决定链路可靠性并影响信道发射功率和用户容量的数值。本就衰落余量对cdma2000lx系统前向链路发射功率和渐近容量的影响进行了深入分析，首先介绍衰落余量概念，提出了cdma2000lx系统前向链路的发射功率和渐近容量表达式，然后通过仿真实验和数值计算给出一定条件下cdma2000lx系统前向链路的业务与导频SNR之间存在的对应关系，最后利用公式与仿真数据研究了衰落余量对前向总发射功率和渐近容量的影响。研究结果表明，cdma2000lx系统的前向总发射功率和渐近容量对衰落余量的大小十分敏感，衰落余量每增加ldB，都会引起总发射功率大幅上升，而渐近容量则迅速下降。     

Pilot power based rate control in CDMA 2000 1x EV-DO Rev-A

This article proposes a new algorithm to improve the rate control efficiency of enhanced reverse link medium access control （RLMAC） in the code division multiple access （CDMA） 1x EV-DO release A（Rev. A） system. The new algorithm brings reverse access terminal （AT） pilot power to the RLMAC rate control procedure and makes it easier for a low pilot power user to increase its data rate when the system is slightly loaded and harder to decrease its date rate when the system is heavily loaded. Numerical results of system level simulations show that the new algorithm can bring higher system throughput, lower AT transmission power, and lower system load.     

Effective adaptive transmit power allocation algorithm considering dynamic channel allocation in reuse partitioning-based OFDMA system

This paper introduces an transmit power allocation (TPA) algorithm considering dynamic channel allocation (DCA) for a reuse-partitioning- based Orthogonal frequency division multiple access (OFDMA)/FDD cellular system. The proposed reuse partitioning-based DCA algorithm guarantees quality of service (QoS) by considering fairness among mobile stations in an OFDMA/FDD system. However, to improve the SINR values for users around the cell edge and increase the overall system throughput compared with the conventional OFDMA/FDD system of frequency reuse factor (FRF) 1, an effective TPA algorithm is also combined with the proposed DCA to adjust the transmit power per user according to the average received SINR value. Simulation results show that the proposed DCA algorithm increases the sector throughput by about 25% when compared with the conventional case that do not apply the proposed DCA algorithm. When the proposed TPA is combined with the proposed DCA algorithm, a further increase in the sector throughput of about 6% is achieved than when using just the proposed DCA algorithm.     

Comparison of average symbol error rate and optimal power allocation for two‐way opportunistic relaying with amplify‐and‐forward protocol

In this paper, we investigate the statistical characteristics of the equivalent end‐to‐end signal‐to‐noise ratios (SNRs), the average symbol error ratios (SERs), and the optimal power allocation (OPA) for two‐way amplify‐and‐forward opportunistic relaying (TWOR‐AF) systems. First, with strict mathematic manipulation, we obtain the closed‐form solutions to the PDF, CDF, and moment generating function of the end‐to‐end SNRs. Then, based on the obtained statistical results, we present the total average SER of the Non‐OPA TWOR‐AF systems by using the appropriate approximation, in which only the greater segment of the two terminal SERs is considered. Finally, by aiming at minimizing the total average SER and using the SNRs balancing condition at both transceivers, we study the OPA problem subject to a total transmission power constraint. The comparison analysis shows that, for the Non‐OPA TWOR‐AF systems, we can only evaluate exactly the greater segment of the two SERs of the received signals at two transceivers by using the derivations. However, for the OPA TWOR‐AF systems, with our derivations we can evaluate exactly not only each segment of the two terminal SERs but also the sum SER (exact total SER). Moreover, the simulations show the OPA TWOR‐AF systems outperform the Non‐OPA TWOR‐AF systems. Copyright © 2012 John Wiley & Sons, Ltd.     

Power allocation in vector estimation systems with the impact of wireless channel uncertainty

Motivated by the fact that wireless channel uncertainty always exists and influences the distributed estimation system, this paper proposes power allocation schemes for linear minimum mean square error estimation. We consider training‐based vector systems and investigate how the power allocation ratio between training and transmitting is influenced by the system information, assuming that the sum of training and data transmitting power is fixed. We propose to use the average mean square error as the distortion measure so as to fulfill the statistical characteristics of channel estimation. We derive the closed‐form solutions to the optimal power allocation ratio, which is the function of system parameters, such as the vector signal's size, channel covariance, and noise covariance. Monte Carlo simulations are carried out to verify the performance of the proposed methods. Simulation results show that (i) in vector estimation system, the power allocation set to be 0.5 is usually not optimal; (ii) compared with training based, the equal power allocation system, the newly proposed methods could significantly improve the estimation performance. Copyright © 2015 John Wiley & Sons, Ltd.     

准静止状态下的高空平台实时业务信道分配

受平台准静止状态的影响,高空平台（ HAPS)通信网络内存在大量的切换呼叫,且业务量动态变化。 HAPS网络可传输多种业务,其中实时业务在切换过程中具有较高的时延要求。通过为切换呼叫预留信道可降低平台不稳定对服务质量（ QoS)造成的影响。在基于服务优先级的多业务信道分配算法基础上,重点对实时业务的信道分配算法进行改进,提出了一种基于概率的预留信道借用策略。该算法可根据网络内业务量的实时统计数据控制新呼叫业务的准入。仿真结果表明：与固定预留信道算法和门限预留信道算法相比,该算法能够适应网络内业务量的动态变化,在保证切换呼叫掉线率满足期望值的条件下提升系统的整体性能,降低平台不稳定造成的性能损失。     

Performance analysis and power allocation for decode‐and‐forward cooperative communications over Rician fading channel

This paper derives the asymptotic symbol error rate (SER) and outage probability of decode‐and‐forward (DF) cooperative communications over Rician fading channels. How to optimally allocate the total power is also addressed when the performance metric in terms of SER or outage probability is taken into consideration. Analysis reveals the insights that Rician factor has a great impact on the system performance as compared with the channel variance, and the relay–destination channel quality is of importance. In addition, the source–relay channel condition is irrelevant to the optimal power allocation design. Simulation and numerical evaluation substantiate the tightness of the asymptotic expressions in the high‐SNR regions and demonstrate the accuracy of our theoretical analysis. Copyright © 2011 John Wiley & Sons, Ltd.     

多业务CDMA系统的速率控制与功率分配

移动通信中速率控制和功率分配是无线资源管理的基础，对于保证业务的质量有重要的作用。本文研究了多码CDMA系统多业务情况下的速率控制和功率分配问题。通过对业务分优先级，速率控制可保证不同业务质量要求，同时总的吞吐量最大。建立了多码CDMA系统的归一化链路增益矩阵，功率分配归结为求解该矩阵在有约束条件下的最大实特征值。本文算法通过业务分级给不同用户的分配传输速率，并通过基于信噪比的功率分配，可充分利用了系统资源，仿真验证了该算法的性能。     

家庭基站系统中的联合信道与功率控制算法

摘 要：本文提出了一种联合信道分配与功率控制算法,通过优化目标将家庭网络的信道分配和功率控制结合,限定干扰范围,采用凸优化和次梯度方法,求解出功率的闭合式,优化了家庭网络的容量。算法又将家庭网络容量与宏网络容量联系,使宏网络容量得到了提升。仿真结果表明,与单纯的功率控制算法相比,本文算法提高了系统容量。