数字信道

However, there exists important difference between watermark channel and common communications channel, which results in some problems in the application of communications theory.

然而，数字水印信道与一般通信信道之间有着比较大的差别，使得直接在水印信道中应用通信技术存在着许多问题。

The Channel of the digital TV is the CATV while of IPTV is the broad-band network.

数字电视传播信息的信道是有线电视网络，网络电视的信道是宽带网络。

Several high speed signal processing technologies of wideband digital receivers,including monbit IFM technology,polyphase channelized technology,channelized digital receiver based on FFT and RF bandpass sampling microwave digital receiver,are discussed in detail.

详细讨论了宽带数字接收机的几种高速信号处理技术，包括单比特瞬时测频技术、多相滤波信道化技术、基于FFT的信道化接收机和射频带通采样微波数字接收机，最后提出了在宽带中频数字接收机高速信号处理领域需要深入研究的有关技术。

Digital channelized receiver is a typical application of software radio based on polyphase filters.

数字信道化接收机是基于多相滤波的软件无线电的典型应用。

This paper introduces a Video on Demand system based on both CATV broadcasting channels and IP interactive network. CATV broadcasting channels are used for content transmission and IP network is used for control information transmission between Set Top Box and Headend Server.

介绍了一种利用有线数字电视广播信道和支持IP交互信道的视频点播系统，广播信道用来传输点播的节目，交互信道传输机顶盒和前端服务器的控制信息，视频点播的各种控制基于DSM-CC协议实现。

A new architecture of digital channelized receiver based on sliding DFT is presented.

提出了一种基于滑动DFT的数字信道化接收机的结构设计。

The study shows that the scheme of digital channelized filters combining digital algorithms can accurately measure frequency with high rate.

具体分析了用DFT构成的数字信道化滤波器组及其后续精测频算法的测频性能，并对该结构进行仿真，得到了比较满意的结果。

This paper presents an efficient architecture of digital channelized receiver based on IDFT poly-phase filter-bank.

中文摘要：本文提出了基于IDFT多相滤波器的数字信道化接收机的高效结构及其参数编码器。

Xilinx_DSP_For_FPGA_Primer》-2005书+课件+笔记+system generator 程序目录The DSP Primer1、Introduction2、Digital Logic Review3、Arithmetic for DSP4、IntroductionToDSP5、Digital Filtering6、Adaptive DSP7、General DSP Hardware8、FPGA Technology9、FPGA Friendly Digital Filters10、Retiming Signal FlowGraphs11、Transposed FIR12、Xilinx Virtex 4 DSP48 Slice13、The CORDIC Algorithm14、Review of VHDL for DSP15、Timing IssuesAugust 2005, University of .

内容简介本书以Xilinx公司的FPGA开发平台为基础，综合FPGA和无线通信技术两个方向，通过大量的FPGA开发实例，较为详尽地描述了无线通信中常用模块的原理和实现流程，包括数字信号处理基础、数字滤波器、多速率信号处理、数字调制与解调、信道编码、系统同步、自适应滤波算法、最佳接收机，以及WCDMA系统的关键技术。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。