博通收购Provigent,获得微波传输技术

Broadcom(博通)公司日前宣布,已经签署收购Provigent公司的最终协议。Provigent未公开上市,为微波回程传输系统提供高集成度、高性能的混合信号半导体产品。Provigent在以色列以及美国加州圣塔克拉拉设有公司机构。Broadcom面向运营商基础设施提供业界最为丰富的系列以太网解决方案,其中包括移动回程传输产品。Provigent在微波无线产品领域拥有卓越的工程专长,收购该公司将使Broadcom得以进一步扩充产品线,     

爱立信将为保加利亚Mobiltel部署和集成传输网络

爱立信与保加利亚的移动运营商Mobiltel签署了一份合同，为其部署并集成爱立信最新的微波传输解决方案MINI—LINKTN，以帮助其降低资本支出和运营费用。该合同涉及传输网络的设计、部署、集成以及MINI—LINKTN软硬件的支持服务。爱立信的微波传输解决方案将在现有传输网络中提供额外的回程容量，并使客户可以通过软键轻松增加更多所需容量。     

Broadcom推出业界首款能实现4G／L TE微波回程传输单芯片系统

Broadcom（博通）公司宣布,推出面向4G／LTE微波回程传输的最新创新产品BCM85620单芯片系统（SoC）。BCM85620专为满足移动回程传输的较大带宽需求而设计,是业界第一个提供千兆及更大带宽的解决方案．也是业界第一个在单个芯片上整合了基带调制解调器与网络处理器的单芯片系统。     

移动回程网络生命周期的测试

1 引言 在无线网络技术中,移动回程(backhaul)服务指通过多种物理媒介将语音和数据信息从基站收发信机(BTS)传输到基站控制器(BSC).通常回程传输由多个T1或E1电路连接实现.     

爱立信与Avea携手在土耳其推出移动宽带业务

日前,土耳其运营商Avea和爱立信签署了一项为期4年的HSPA网络合同。根据协议,爱立信将成为Avea的主要供应商之一,为其整合和部署WCDMA／HSPA无线接入网和分组核心网,并提供一整套基于微波传输和光纤传输技术的移动回程解决方案。这一新建的HSPA网络将突破移动宽带的瓶颈,     

基于用户个体的混合CoMP模式选择算法

CoMP的两种传输模式CoMP-JP与CoMP-CB在对回程容量需求以及提升系统性能方面具有不同的优势.针对回程容量紧缺问题,在传统以用户群为优化对象的模式选择基础上,提出了一种混合CoMP模式选择算法.该算法针对用户个体选择最佳传输模式,充分利用回程容量的同时最大化系统吞吐量.仿真结果表明,所提出的模式选择算法能有效提升系统性能,并且随着用户数的增加,其性能增益会更高.     

导入ARM内核，LSI扩展无线产业环境

移动终端设备日益多元化，移动宽带的使用不断增长，网络从2G／3G向LTE和LTE-Advanced升级，运营商需要低成本、低功耗的解决方案将回程从原有系统向IP网络迁移。移动回程网络正面临移动宽带流量持续增长带来的压力。LSI不久前即针对室内和室外微波单元、蜂窝基站路由器、     

博通推出新的BCM56440交换芯片系列

4月13日,Broadcom(博通)公司宣布,正式推出新的StrataXGS BCM56440交换芯片系列。目前,无线数据业务量呈指数增长态势,运营商也在越来越快地向4G迁移,因此传统移动网络纷纷升级。在网络升级过程中,运营商面临着经济性和性能挑战,而BCM56440系列产品是专门为帮助运营商应对这些挑战而设计的。该系列产品能提供极大的带宽,比基于时分多路复用(TDM)的传统网络的带宽大1000倍,可帮助运营商实现网络的无缝迁移,以使移动回程传输网络具有以太网级性能,并能传送高级业务。预计到2014年,在移动回程传输设备上的支出将     

产业动态

并购Broadcom收购Provigent,获得微波传输技术Broadcom(博通)公司宣布,已经签署收购Provigent公司的最终协议。Provigent未公开上市,为微波回程传输系统提供高集成度、高性能     

BCM56240：交换方案

Broadcom公司推出一个新的交换解决方案系列,该系列解决方案进行了优化,以满足快速增长的小型蜂窝基站市场对带宽、可扩展性和效率的要求。BCM56240系列基于Broadcom获奖的StrataXGS架构,并为移动回程传输进行了优化,在单个芯片上集成了多达4个独立组件的功能。     

Connectivity evaluation and error performance of millimeter-wave wireless backhaul networks

The general trend in the backhaul link technology arena is the increasing use of high-speed microwave solutions. The ever-rising demand for high capacities at low cost has recently enhanced the interest in wireless backhaul networks. Evaluating the connectivity of the wireless multi-hop backhaul networks is a significant task. Taking into account the high frequency of operation, a novel analytical and engineering propagation model is presented for the calculation of connectivity. Furthermore, the minimum required node density in order to keep the network connected is also calculated. The sensitivity of network connectivity on frequency operation, transmission power, and climatic conditions is also investigated. Finally, the error performance of the backhaul network links is finally presented, and some very useful conclusions are drawn.     

Experimental demonstration of a distributed ring-based EPON architecture

We experimentally demonstrate error free performance of a simple ring-based Ethernet Passive Optical Network (EPON) architecture that supports truly shared LAN capability among users as well as a fully distributed dynamic bandwidth allocation DBA scheme. The proposed distributed architecture can also be utilized as a packet-based mobile backhaul transport network to backhaul emerging mobile services across the PON-based fiber infrastructure. Utilizing PON access infrastructure as a mobile backhaul enables a seamless migration path to fixed-mobile convergence solutions.     

Investigations on bit error performance for video over DAB

The digital audio broadcasting (DAB) system which was originally designed for high quality audio transmission to mobile receivers is investigated for transmission of compressed digital video and multimedia signals. The bit error performance is considered using various levels of error protection provided by the DAB system. As a result, a net bit rate of about 1.5 Mbit/s can be achieved. With additional error correction coding, a bit error ratio (BER) of less than 10^-10 can be realized. This is the requirement for compressed video signals. The SNR per bit is below 16 dB. The results are demonstrated and compared using computer simulations of the complete system     

Simulation of digital transmission over mobile channels at 300 kb/s

Studies of digital transmission over typical urban and suburban mobile channels using simulations that employ a local area model for the time varying mobile channel impulse response are discussed. The digital transmission techniques of coherently detected and differentially coherent detected versions of quadrature phase-shift keying (QPSK), Gaussian minimum shift keying (GMSK), and coherently detected binary phase-shift keying (BPSK) over example mobile channels are presented. Two measures of performance are considered; the mean bit error ratio (and irreducible bit error ratio), which is used to compare the robustness of the various modulation methods to delay spread, and the outage probability, which provides a measure of the overall transmission quality as would be perceived by a user. Emphasis is placed on results obtained for GMSK, which is the modulation scheme to be employed in the Pan-European digital cellular mobile system. The effects of RMS delay spread on the mean bit error ratio, mean irreducible bit error ratio, and probability of outage are considered for different channel types     

Adaptive TTI bundling with self-healing scheme for 5G

The flexibility of the media access control(MAC) layer has always been an important concern in the existing communication architecture. To meet the more stringent requirements under large-scale connections, the MAC layer structure needs to be optimized carefully. This paper proposes a new architecture of the MAC layer to optimize the complex communication backhaul link structure, which will increase the flexibility of the system and decrease the transmission delay. Moreover, an adaptive transmis...     

Cost- and energy-efficient backhaul options for heterogeneous mobile network deployments

Heterogeneous networks (HetNets) have the potential to cater for the capacity requirements of mobile broadband services at reduced cost and energy consumption levels. One key aspect in HetNets is the role of the backhaul. More specifically, it is crucial for a mobile operator to understand the impact of specific technological and architectural upgrades in the mobile backhaul network on the capital and operational expenditure (i.e., CAPEX and OPEX). This paper proposes a comprehensive methodology that can be used to analyze the total cost of ownership of a number of backhaul options based on fiber, microwave, and copper technologies. The study considers both a Greenfield and a Brownfield scenario and takes into account the mobile broadband capacity requirements for the time period between years 2015 and 2025. From the results presented in the paper it can be concluded that even though microwave and fiber will be predominately used in the future, the possible migration paths leading to such fiber- and microwave-based backhaul scenarios might be different, depending upon factors such as spectrum and license costs, time to deployment, availability of equipment, and required quality of service levels.     

Dependence of the error performance of turbo-codes on theinterleaver structure in short frame transmission systems

The dependence of both bit and frame error performance, respectively, of the novel parallel concatenated recursive systematic codes, termed turbo-codes, on the interleaver structure is investigated in frame transmission systems with frames containing 192 bits required for speech transmission in a possible future mobile radio system     

Results on turbo-codes for speech transmission in a joint detectionCDMA mobile radio system with coherent receiver antenna diversity

Turbo-codes which are applicable to speech transmission in digital mobile radio systems are treated. Three turbo-codes of different complexity are presented. The proposed turbo-codes are suitable for the application to speech transmission in the joint detection code-division multiple access (JD-CDMA) mobile radio system with coherent receiver antenna diversity (CRAD) which are described concisely. The performance of the designed turbo-codes in terms of bit and frame error rates are shown in the case of additive white Gaussian noise (AWGN) channels, flat Rayleigh fading channels, and in the uplink of the aforementioned JD-CDMA mobile radio system     

Hybrid beamforming with discrete phase shifters for millimeter wave backhaul networks

Hybrid beamforming (HBF) technology becomes one of the key technologies in the millimeter wave (mmWave) mobile backhaul systems, for its lower complexity and low power consumption compared to full digital beamforming (DBF). Two structures of HBF exist in the mmWave mobile backhaul system, namely, the fully connected structures (FCS) and partially connected structures (PCS). However, the existing methods cannot be applied to both structures. Moreover, the ideal phase shifter is considered in some current HBF methods, which is not realistic. In this paper, a HBF algorithm for both structures based on the discrete phase shifters is proposed in the mmWave mobile backhaul systems. By using the principle of alternating minimization, the optimization problem of HBF is decomposed into a DBF optimization problem and an analog beamforming (ABF) optimization problem. Then the least square (LS) method is enabled to solve the optimization model of DBF. In addition, the achievable data rate for both structures with closed-form expression which can be used to convert the optimization model into a single-stream beamforming optimization model with per antenna power constraint is derived. Therefore, the ABF is easily solved. Simulation results show that the performance of the proposed HBF method can approach the full DBF by using a lower resolution phase shifter.     

Video transmission over mobile satellite systems

Mobile satellite communication channels are characterized by long transmission delays, variation of these delays, high bit‐error‐rates, shadowing and the multipath effect which severely reduce the quality of video services. Error control techniques including feedback mechanisms, error concealment methods, forward error correction techniques and error resilience schemes are examined in this paper for achieving a high‐integrity video transmission over a mobile satellite channel. The application of three different error resilience algorithms, namely Turbo codes, error‐resilient entropy codes and two‐way decoding using reversible codes is presented. Their joint performance is also examined. Furthermore, a low‐delay and low‐complexity video transcoding algorithm which fully interconnects two very low bit rate video communication standards: MPEG‐4 and H.263 is also elaborated. This transcoder works as a gateway tool which links two heterogeneous multimedia networks, such as a mobile satellite network and a land‐based network, with negligible processing delay and complexity. Copyright © 2000 John Wiley & Sons, Ltd.