信道带宽

该算法采用信道带宽作为QoS参数来刻画网络的异类性。

The key QoS parameter adopted in this algorithm is channel bandwidth which denotes the heterogeneity of the networks .

在这种环境下，那些没有执行MAC协议的节点可以获得不公平的信道带宽。

In this environment , some hosts that fail to adhere to the MAC protocol may obtain an unfair share of the channel bandwidth .

随着Internet的迅猛发展，人们对信道带宽的要求呈爆炸性增长。

With the rapid development of Internet , broad bandwidth is on demand greatly .

补充信道带宽振荡对上层TCP业务吞吐量的严重影响；2。

The bandwidth oscillation of supplemental channel greatly affects the throughput of the upper TCP service ; 2 .

EPON上行信道带宽动态分配技术研究

Study on the Dynamic Bandwidth Allocation Schemes of EPON Upstream Channel

本论文主要对EPON上行信道带宽动态分配技术进行了研究。

The research is mainly focused on the dynamic bandwidth allocation schemes of EPON upstream channel .

提出了一个基于分布式性能增强代理的卫星网络专有通信协议：XP协议，用于解决卫星网络环境中因长时延、高误码率和非对称信道带宽等因素所导致的TCP传输性能低下问题。

Based on distributed performance enhancing proxies , a new transport protocol for the satellite environment , the XP protocol is presented .

随着无线信道带宽的增加和移动设备计算能力的增强，移动adhoc网络中的视频应用将越来越多。

With the increasingly broadened wireless channel bandwidth and enhanced computation capability of the mobile devices , video applications will be widely used in the mobile Ad hoc networks .

OFDM系统各子信道带宽较小，各个子载波之间利用正交性来区分，所以精确的载波频率同步对于OFDM系统来说至关重要。本论文重点研究了SISO-OFDM系统和MIMO-OFDM系统的载波同步问题。

Based on the key technology research in B3G-TDD systems , carrier frequency synchronization in SISO-OFDM systems and MIMO-OFDM systems are researched in this dissertation .

多输入多输出（MIMO）系统在不增加信道带宽的情况下，有效提高了系统的容量，它是下一代无线通信系统的关键技术之一。

Multiple-input multiple-output ( MIMO ) system can effectively improve the system capacity without any increase in channel bandwidth ; it is the key technology of the next generation of wireless communication system .

由于水声信道带宽严重受限特性及AUV图像数据存储空间有限等影响，使得视频图像压缩编码成为水下目标视觉识别应用的关键技术。

Due to the limited bandwidth of acoustic channel and storage space for video data , underwater video compression technology became the key to underwater visual detection .

针对吞吐量的技术有：星座映射（MQAM）、码率、空间流和信道带宽。

The part undertakes the throughput such as constellation mapping ( M_QAM ), code rate , the number of spatial stream and the channel bandwidth .

文中给出了不同网络规模、冲突解析算法参数值、上行信道带宽分配策略条件下的实验结果。最后提出了优化HFC网上行信道时隙同步性能的措施。

The experimental results under different conditions , such as network scale , parameter value of competition resolution algorithm and bandwidth allocating scheme for the upstream channel are given , and the optimizing methods are proposed .

实验结果表明，该方法在给定信道带宽和报文丢失率的情况下，相对于不带比特分配的ARQ系统，能够取得更好的图像质量，在低码率情况下尤为明显。

Experiment shows that the optimal scheme can achieve higher quality than general ARQ system at the same environment ( channel capacity and packet loss rate ), especially in low bit rate channel .

仿真结果表明，该方法明显优于未保护的MPEG-4方法，在相同信道带宽及丢包率条件下比等纠错保护的MPEG-4编码方法获得更加稳定的性能。

Simulation results show that the method has the performance obviously higher than that of un-protected MPEG-4 , and can be more stable than MPEG-4 equal error protection method under the same conditions of bandwidth and packet loss rate .

假定不同的业务可以有任意的信道带宽需要和平均信道占用时间，本论文对thinning方案的两个变体进行了分析，利用多唯马尔科夫链理论，得到了thinning方案的阻塞性能。

We consider that different service types have arbitrary bandwidth requirements and average channel holding times . Two variations of the thinning scheme are investigated and call blocking performance analysis is carried out using the theory of multi-dimensional Markov birth-death process .

由于同步信道带宽太小，为了保证同步性能同时又不增加小区搜索时间，可以在同一帧内发送多个SCH，然而，降低了系统效率。

With the small SCH bandwidth , synchronization performance can be guaranteed by transmitting several SCHs at a radio same frame while not increasing cell search time and however , decreasing the system efficiency .

在系统设计的过程中，我们根据海上VHF语音信道带宽的窄（25KHz）特点和系统的需要，设计了基于AMBE压缩算法的硬件电路，实现了语音的低速率编码；

Because VHF voice channel is a narrow band ( 25KHz ), so in the system we design hardware circuit based on AMBE speech compression to realize low digital speech code rates .

光纤接入网尤其是PON技术以其巨大的带宽优势受到了广泛的关注。由于所有用户分享信道带宽，EPON、GPON这种基于TDM/TDMA技术的无源光网络，无法满足未来用户对网络带宽持续增长的需求。

Optical access network , especially PON , with huge bandwidth has been widespread concerned , Since all users share the bandwidth , EPON , GPON which based on TDM / TDMA technology is unable to meet the growing demand for network bandwidth .

因此数据传输所需要的信道带宽也相应减少。

The needed channel bandwidth is also reduced accordingly .

该算法采用了随机控制技术来适应无线信道带宽的随机变化。

The algorithm adopts stochastic control technique to adapt the variation of wireless bandwidth .

传真是现代通信的主要业务之一，在传输中信道带宽利用率较低。

Fax is one of the primary traffic of modern communication , but its usage of bandwidth is low .

针对不同的卫星导航信号，该前端电路的频率和信道带宽都可以容易地更改。

The frequency and bandwidth of the front-end circuit can be changed easily according to different satellite navigation signals .

信道带宽与功率互换原理是信息论的一条重要原理。

The exchange between signal power and channel bandwidth is an important deduction of Shannon 's channel capacity theorem .

结合空间分集，空时编码在不增加信道带宽的情况下能提高系统的传输速率，达到良好性能。

Combined with spatial diversity , space-time coding can provide high data rates and good performance without extra bandwidth demand .

它不同于现代通信工程中传输已调制信号时所需要的信道带宽。这是本文所证明的基本结论。

The bandwidth is different from the bandwidth of the channel transmitting the modulated signal in the modern communication system .

在视频通信中，为了在有限的信道带宽上传输视频，需要首先对原始视频信号进行有效的压缩。

In video communication , to transfer a video sequence over limited channel bandwidth , effective video compression is essential .

盲符号估计不需要利用已知序列对滤波器参数进行周期训练，从而能有效地节省信道带宽。

Blind symbol estimation can save bandwidth efficiently because the method needs not predetermine channel response and perform channel identification .

采用信道带宽充裕度衡量视频序列的编码复杂度和信道带宽之间的关系。

Channel bandwidth sufficiency is introduced to evaluate the relationship between channel bandwidth and the encoding complexity of video sequence .

由其带来的信息爆炸，使信道带宽和信道传输速率成为多媒体技术发展的瓶颈问题。

The information explosion has made the transmission rate and channel bandwidth become bottlenecks in the development of multimedia technology .