无冲突NC—IPRMA协议下的数据——话音综合

提出了一个面向微蜂窝通信的支持数据－－话音综合业务的无冲突分组预约多址协议－－ＮＣ－ＩＰＲＭＡ协议,通过Ｍ／Ｍ／Ｎ∞／Ｍ,排队模型分析了ＮＣ－ＩＰＲＭＡ协议的话音子系统性能,通过系统仿真分析了数据－－话音综合性能。研究结果表明,在支持数据－－话音综合业务方面,ＮＣ－ＩＰＲＭＡ协议比ＰＲＭＡ和ＩＰＲＭＡ协议更高效,这包括更高的认道利用率,更短的数据分组时延和更大的话音终端容量。由于采用排队等待方式接     

冲突消弱分组预约多址协议及其性能分析

本文讨论了分组预约多址接入（ＰＲＭＡ）协议的缺点,提出了一种突消弱分组预约多址接入（ＣＲ－ＰＲＭＡ）协议,理论分析和计算机仿真均表明ＣＲ－ＰＲＭＡ的性能优于ＰＲＭＡ。     

一种基于服务质量(QoS)的分组预约多址协议

本文从用户角度和实际通信情况考虑,提出了一种基于服务质量的分组预约多址协议（ＥＴ－ＰＲＭＡ）。该方法利用用户信息之间的相关性,适当地调整分组预约多址（ＰＲＭＡ）协议中的话音用户再次竞争信道的概率,提高ＰＲＭＡ系统中话音终端获取信道的速度,从而达到提高话音业务性能,从计算机仿真的结果看,该方法对提高ＰＲＭＡ系统中话音业务的性能确有帮助。     

HFC网络中上行信道三种协议的比较

讨论了基于ＨＦＣ（混合光纤同轴电缆）网络上行多址接入信道的数据通信，比较了几种适于ＨＦＣ中ＭＡＣ（媒体输入控制）层上行数据流的协议，包括分布式协议Ｒ－ＡＬＯＨＡ，集中式协议Ｕ－ｎｉＬＮＫ以及一种新的协议ＰＣＵＰ（流水线循环上行流协议）最后得出ＰＣＵＰ协议比较适合ＨＦＣ网中的双向交互式业务的结论。     

Multi-Tech公司推出企业网话音方案系列产品

以生产Ｍｏｄｅｍ而著称的美国摩迪泰克（Ｍｕｌｔｉ－Ｔｅｃｈ）公司从１９９８年开始逐步向网络产品进军,除了推出系列ＲＡＳ产品之外,最近在中国市场力推企业网话音方案。Ｍｕｌｔｉ－Ｔｅｃｈ公司的企业网话音产品分为两类,一类为ＶＯＩＰ（ＶｏｉｃｅＯｖｅｒＩＰ）产品,一类为ＶＯＦＲ（ＶｏｉｃｅＯｖｅｒＦｒａｍｅＲｅｌａｙ）产品,分别适合于企业ＩＰ网和企业帧中继网。Ｍｕｌｔｉ－Ｔｅｃｈ公司的企业网话音系列产品具有话音质量好、安装简单、拨号方便的特点,特别适合于具备以下三个条件的单位和部门：①企业内部的数据网…     

帧中继上的话音业务──ACTnetworks.Inc的解决方案

帧中继上的话音业务──ＡＣＴｎｅｔｗｏｒｋｓ．Ｉｎｃ的解决方案中国矿业大学北京研究生部毕立波，陈晓钟ＡＣＴｎｅｔｗｏｒｋｓ．Ｉｎｃ关于帧中继上的话音解决方案典型地，一个帧中继接入设备（ＦＲＡＤ）只支持数据协议。但是，ＡＣＴ的ＳＤＭ－ＦＰ和ＳＤＭ－ＪＦ...     

INMARSAT—C系统通信网及其信道接协议

本文阐述ＩＩＮＭＡＲＳＡＴ－Ｃ系统通信网的组成，系统通信及其接续协议，而后简述两种随机多址接续方式。     

第三代移动通信系统中一种多址接入方案的性能分析

对一种多址接入方案—联合ＣＤＭＡ／ＰＲＭＡ方案在单纯话音业务、混合话音和数据业务以及混合话音和图像业务情况下分别进行计算机模拟并分析结果，得出其性能优于单纯ＣＤＭＡ方案的结论。     

改善分组预约多址协议中话音业务性能的一种方法

本文在分析分组预约多址（ＰＲＭＡ）协议的基础上,从用户角度和实际通信情况考虑,提出了基于补偿性参数作为系统的性能参数,并采用适当加大用户再次竞争信道的允许概率来提高ＰＲＭＡ系统中话音业务性能的方法（ＶＰ－ＰＲＭＡ）,从计算机仿真的结果看,该方法对提高ＰＲＭＡ系统中话音业务的性能确有帮助。     

两种改进的适用于多目标情况的恒虚警检测算法

本文基于筛选平均和无偏筛选平均提出了两种改进的恒虚警检测器－ＭＣＭ－ＣＦＡＲ和ＭＵＣＭ－ＣＦＡＲ，并应用了何友提出的自动筛选技术，在ＳｗｅｒｌｉｎｇⅡ型目标似假设下，并考虑瑞利分布杂波和单脉冲检测情形，本文推导出了ＭＣＭ－ＣＦＡＲ和ＭＵＣＭ－ＣＦＡＲ检测器的Ｐｆα，Ｐｄ和平均判决门限的解析表达式，并与其它方案进行了比较。     

话音/数据综合的多时隙预约多址协议及其性能分析

本文提出了一种综合话音和数据的多时隙预约多址协议.该协议在保证话音终端的优先权的情况下,允许数据终端在报文的传输期间在连续多个帧中预约多个信息时隙.文中对协议进行了理论分析,并推导出了协议的重要性能指标(如话音分组丢失率、数据报文平均接入时延、系统平均吞吐率等)的解析表达式.研究表明,该协议可以支持比IPRMA、NC-IPRMA更高的等效数据终端速率,而且系统平均吞吐率在很大的负载范围内接近最大值.     

分组卫星话音／数据综合的混合多址协议性能研究

本文讨论了一种用于分组话音／数据综合的混合多址协议，该协议是固定分配与随机访问的混合，并且赋予话音分组优先传输权，从而保证了无重传话音分组有较小的丢失概率。本文进行了详细的理论分析，并得出了性能比较特性，所得结果认为这是一个兼顾话音／数据综合的较好协议，且具有一定的灵活性。     

Stability and Optimization Analysis for the PRMA Protocol for Voice and Burst Data Integration in a Personal Communication Network

Personal Communication Networks (PCNs) have become an important filed of activity and they are expected to play a fundamental role in next-generation telecommunication systems. In particular, the emerging personal communication services, such as portable computing, paging, personal e-mail, etc. have led to the need of an efficient integration of voice and data traffic in a same PCN by means of a suitable multiple-access scheme. This paper considers stability and optimization issues for the Packet Reservation Multiple Access (PRMA) protocol used for integrating voice and burst data traffic in a PCN. An important result here devised is that the optimized PRMA protocol permits to be achieved good performance even under heavy traffic load conditions.     

Two Auction-Based Protocols for Fair and Fast Resource Assignment in Wireless PCS

The Resource Auction Multiple Access (RAMA) protocol was recently proposed for fast resource assignment in wireless PCS networks. The protocol assigns communication resources to subscribers using a collision resolution method based on subscriber ID's. In each auction cycle, the subscriber with the highest ID will obtain the resource. Thus the RAMA protocol encounters the unfairness problem since subscribers with lower ID's might be delayed forever. In this paper, we propose two modifications to the RAMA protocol to solve the unfairness problem. The first modification forces the RAMA protocol to process requests in bursts, i.e., new requests are not processed until the current burst of requests are all satisfied. The second modification asks the base station to select subscribers randomly instead of the one with the highest ID. We derive mathematical models to compare the performances of proposed and original protocols. Performance results indicate that the modification of random selection is fairer than other protocols in terms of the waiting time distribution.     

时分双工环境下的分组预约多址(PRMA/TDD)协议及其性能

在分析标准分组预约多址（PRMA／FDD）协议的基础上,提出了时分双工环境下的分组预约多址（PRMA／TDD）协议,理论分析和计算机仿真均表明,PRMA／TDD与PRMA／FDD的性能相近,可以较大幅度地提高系统的容量。     

Block Reservation Time Division Multiple Access (BRTDMA) Protocol for a High Capacity Wireless Network

Next generation high capacity wireless networks need to support various types of traffic, including voice, video and data, each of which have different Quality of Service (QoS) requirements for successful transmission. This paper presents an advanced reservation packet access protocol BRTDMA (Block Reservation Time Division Multiple Access) that can accommodate voice and data traffic with equal efficiency in a wireless network. The proposed BRTDMA protocol has been designed to operate in a dynamic fashion by allocating resources according to the QoS criteria of voice and data traffic. Most of the existing reservation protocols offers reservation to voice traffic while data packets are transmitted using contention mode. In this paper we propose a block reservation technique to reserve transmission slots for data traffic for a short duration, which minimizes the speech packet loss and reduce the end-to-end delay for wireless data traffic. The optimum block reservation length for data traffic has been studied in a cellular mobile radio environment using a simulation model. Simulation results show that the BRTDMA protocol offers higher traffic capacity than standard PRMA protocol for integrated voice and data traffic and offers flexibility in accommodating multimedia traffic.     

一种适合时分双工环境的分组预约多址协议

对数字式蜂窝移动通信网络,本文提出了时分双工环境下的冲突削弱分组预约多址（CR－PRMA／TDD）协议,并使用平衡点法推导出给定同时通话终端数时的分组丢弃率。计算机仿真结果表明,CR－PRMA／TDD协议可以极大地提高系统的容量。     

CDMA无线分组网中新MAC协议的研究

该文在语音与数据混合的CDMA无线网络中提出了一种新的媒质访问控制（MAC）协议MSADQ（Minislot signaling Access based on double Queue)。该协议基于分布队列及冲突解决算法，通过对PN码字的有序管理，从而大大减少随机竞争的冲突，降低多址接入干扰，节省PN码码资源。提出了码字分配算法和队列管理算法，对语音和数据业务进行QoS保证。对协议的性能进行了仿真，并与其他两种预约协议进行了比较，结果表明，MSADQ／CDMA协议使用较少的PN码字却仍然有很好的性能。     

Optimum Power Assignment for Maximum Throughput in CDMA Personal Communication Systems with Integrated Voice/Data Traffic

A CDMA personal communication system with integrated voice/data traffic is considered, in which the link error performance is controlled according to the voice error rate requirement, and the acceptable data traffic error rate is ensured by ARQ. Optimum power assignment (or allocation) between voice and data users is investigated to maximize the total system throughput. A graphical method (the tangent method) is described to obtain this optimum power allocation. The maximum throughput is expressed as a function of other system parameters. The tangent method is further used to measure the impact of transmission quality on the maximum data throughput. Numerical results and a design example are given for a power controlled wideband IS-95 type wireless personal communication system.