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信道状况
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  channel condition
     A new rate adaptation protocol EARF(Enhanced ARF) is proposed for IEEE 802.11 based on ACK frame statistical information. The main idea is to assign each transmission rate a unique success threshold,which is controlled by a delay factor to quantify the responsiveness of a link adaptation,and dynamically updated along with channel condition.
     提出了一种新颖的基于连续ACK帧统计信息的IEEE 802.11多速率自适应MAC协议EARF(EnhancedARF),其主要思想是:每一个速率有各自的成功阈值——速率升高的门限值,并且该值根据信道状况(用延时因子量化)动态地变化。
短句来源
     We can use a higher modulation by adaptive modulation technique when the channel condition is good. The overall system frequency utilization efficiency can be improved greatly, and the system capacity can be doubled.
     使用自适应调制技术,在信道状况好的时候可以使用较高的调制,整个系统的频谱利用率得到大幅度的改善,自适应调制能够使系统容量翻番。
短句来源
     With the method, the initial state of incremental redundancy system and the initial sending parity bits according to the channel condition will be set.
     该方法根据当前的信道状况设定递增冗余的初始状态,选择初始发送的校验比特.
短句来源
     By taking the time-varying wireless channel condition and video codec characteristics into account,we implement JSCC(Joint Source and Channel Codec) based on minimum-distortion.
     综合考虑时变无线信道状况和视频编码特性,实现基于最小失真的联合信源和信道编码。
短句来源
  channel state
     To solve the large Doppler frequency offset that comes from the multipath satellite spread spectrum signal,the improved "partial correlation" algorithm is used in matched filter,at the same time the length of estimation is changed according to channel state in channel estimation based on the parallel pilot. The algorithm can accomplish the baseband processing of satellite spread spectrum signal with large Doppler frequency offset.
     针对多路混叠的卫星扩频信号下变频以后所产生的大多普勒频偏,在匹配滤波结构中采取改进的部分相关算法,在基于并行导频的信道估计中根据信道状况改变估计长度,实现了大频偏下卫星扩频信号的基带处理。
短句来源
  status of channel
     With increasing of Doppler frequency offset, status of channel doesn′t hold stabilization for long and whole correlation of false codes hasn′t satisfied require of channel estimation.
     随着多普勒频偏的增大,信道状况无法长时间保持平稳,伪码的完整相关已经不能满足信道估计的要求。
短句来源
  “信道状况”译为未确定词的双语例句
     DTTB (Digital Television Terrestrial Broadcasting), as one of the three digital television spread methods, has the strictest request to the whole technology system, due to the complex ground channel and mobile function, in addition to portable reception.
     作为数字电视三大传播方式之一的数字电视地面广播(DTTB:Digital Television Terrestrial Broadcasting),由于地面信道状况复杂,在应用需求上又要求实现移动和便携接收的功能,使整个技术系统的要求最高。
短句来源
     DTTB (Digital Television Terrestrial Broadcasting), as one of the three digital television transmission techniques, is the most complicated representation for its complexity of ground condition and availability of mobile receiving.
     作为数字电视三大传播方式之一的数字电视地面广播(DTTB: Digital Television Terrestrial Broadcasting),由于地面信道状况复杂,在应用需求上又要求实现移动和便携接收的功能,因此对整个技术系统的要求最高。
短句来源
     Based on the Intel channel model approved by the IEEE 802.15.SG3a group, performance of RAKE receiver in single user UWB communication system is studied, employing the pulse amplitude modulation and taking into account the inter-symbol interference.
     在最终被IEEE802.15.SG3a研究组采纳的Intel信道模型的基础上,针对单用户超宽带通信系统,采用二进制脉冲幅度调制方式的UWB信号在不同的信道状况(CM1、CM2、CM3、CM4)下,考虑存在码间干扰时对RAKE接收机的性能进行研究.
短句来源
     Since OFDM is a multi-carrier system, Adaptive Modulation and Coding (AMC) techniques can be effectively and efficiently used to enhance the system performance in terms of both BER/FER and overall system capacity.
     自适应调制与编码的主要机理是:在信道状况好时,采用高阶的调制方式和较高码率的信道编码,以提高系统的吞吐量性能;
短句来源
     The transmitter can adaptively change the transmission mode between two methods according to the actual channel States.
     基站可以根据实际的信道状况自适应地调整发射方法。
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  channel condition
The streaming server dynamically performs priority-based frame dropping to adjust the sending rate according to the measured wireless channel condition.
      
Variables related to channel condition, instream substrate, water chemistry, and residential and transportation right-of-way land uses were identified by principal components analysis as significant factors separating site groups.
      
This model not only accounts for the number of contending nodes, the contention window, but also the packet size, and the channel condition.
      
Simulation results show that the quality of the reconstructed video sequence is vastly improved by using HRFEC, when the channel condition is poor.
      
Wireless LAN technologies such as IEEE 802.11a and 802.11b support high bandwidth and multi-rate data transmission to match the channel condition (i.e., signal to noise ratio).
      
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  channel state
Markov Chain Monte Carlo (MCMC) method is employed to jointly estimate the Channel State Information (CSI) and the transmitted signals.
      
Considering the bandwidth inefficiency of Frequency Shift Keying (FSK), the acquisition of channel state information through training sequences will further decrease the transmission efficiency.
      
In which, superimposed pilot scheme is adopted and an initial Channel State Information (CSI) is obtained by employing a first-order statistic.
      
The presented scheme named M-CAP (Maximum CAPacity) uses the CSI (Channel State Information) and its statistics to deduce an equivalent channel according to which the transmit power is allocated to the subchannels.
      
Adaptive modulation can optimize the spectrum efficiency and system performance with the channel state information achieved by the long-range channel prediction.
      
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  status of channel
A relation for the energy dissipation term must be provided in the model, which in turn depends on debris flow rheology and shape and status of channel bed.
      
Growth performance, body composition and plasma thyroid hormone status of channel catfish (Ictalurus punctatus) in response to s
      


The integration of multimedia services in wireless communication systems calls for various qualities of services (QoS). In this paper, we make use of software radio technology, via field programmable gate arrays (FPGA) and digital signal processor (DSP), implement a reconfigurable linear multiuser detector for Direct-sequence CDMA systems. According to service requirement and channel characteristics, it provides diverse QoS guarantees. Simulation resulot gives comparison of four different kinds of linear multiuser...

The integration of multimedia services in wireless communication systems calls for various qualities of services (QoS). In this paper, we make use of software radio technology, via field programmable gate arrays (FPGA) and digital signal processor (DSP), implement a reconfigurable linear multiuser detector for Direct-sequence CDMA systems. According to service requirement and channel characteristics, it provides diverse QoS guarantees. Simulation resulot gives comparison of four different kinds of linear multiuser detectors with varying user number and Signal-to-Noise (SNR) condition.

无线多媒体通信的实现要求对不同种类业务提供不同的服务质量 (QoS) ,文章将软件无线电技术应用于无线通信系统中 ,通过现场可编程门阵列 (FPGA)和数字信号处理器 (DSP)的配合实现DS -CDMA系统的线性多用户检测 ,可以根据业务要求与信道状况调整线性滤波器抽头值 ,从而动态选择检测器类型 ,在算法复杂度和性能上求得平衡。仿真结果给出了 4种线性多用户检测器对用户数及信噪比变化的性能比较。

This paper introduces ways of hierarchical coding based on the international standard MPEG-2,and produces two video layers from one source video based on data division hierarchical way.These two layers have different image quality,the low layer will be decoded by itself to provide a video with basal quality,while the enhanced layer will be used to improve the quality of the video that produced by the low layer.Through experiment,the enhanced effect on the quality of the base layer video is showed to be evident...

This paper introduces ways of hierarchical coding based on the international standard MPEG-2,and produces two video layers from one source video based on data division hierarchical way.These two layers have different image quality,the low layer will be decoded by itself to provide a video with basal quality,while the enhanced layer will be used to improve the quality of the video that produced by the low layer.Through experiment,the enhanced effect on the quality of the base layer video is showed to be evident and promising,and it is adaptive to network condition and can satisfies requirements of real-time video communications. [

本文介绍了基于MPEG - 2国际标准的可分级编码方法 ,并以数据分割可分级方法对一个视频源产生的具有不同视频质量的视频层 ,用基本层编码提供基本视频质量 ,增强层则被编码来增强基本层。实验结果证明 ,增强层对基层的图像质量确实有相当的增强作用 ,并能自动适应网络信道的状况满足实时视频传输的要求

Multi-carrier CDMA(MC-CDMA) is a multi-address access technique which concatenates OFDM and DS-CDMA. How to retrieve transmitted signals from received signals concerned with frequency diversity and equalization. Energy controlled equalization technique, proposed by the author, can well restore the orthogonality of spreading code and avoid effects of deep fading of channel in the case of multi-user environment. And experiments show that it is suitable to different channels.

多载波CDMA(MC-CDMA)是将多载波调制OFDM与DS-CDMA结合起来的多址访问技术。如何从接收到的信号恢复出发送信号,涉及到频率分集接收和均衡。本文提出的能量受控均衡技术,在多用户的环境下能较好地恢复扩频码的正交性且避免信道深度衰落的影响,而且,实验表明该方法对于不同的信道状况均能很好适应。

 
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