另外在未来宽带MIMO无线通信系统中，通常面临频率选择性衰落信道，传统高性能均衡器就会变得异常复杂。
In addition, there will be frequency selective fading in the future broadband MIMO wireless communication systems, and the traditional high-performance equalizer will become extremely complicated.
在未来的宽带无线通信系统中，存在着两个严峻的挑战：无线信道的多径衰落和频谱效率。
There are two serious challenges in the future broadband wireless communication systems: multi-path fading in the wireless channel and spectral efficiency.
尽管短波窄带信道模型已经诞生了几十年，但是随着短波通信向宽带化发展，它已经不能适应复杂的短波宽带信道条件。
Although narrowband models of the HF channel have existed for many years, with the development of the HF communication they are not applicable to the complex wideband HF channel conditions.
在宽带无线数字通信系统中，影响信息高速传输的最主要的一类干扰是由信道的多径效应所引起的频率选择性衰落。
The bandwidth efficiency and ability to combat the effects of frequency selective channels are critical issues in the design of wideband wireless digital communications system.
OFDM无线宽带移动通信系统中信道估计与均衡技术研究，Ph。
D thesis, OFDM wireless broadband mobile communication systems channel estimation and equalization study, Ph.
空间光学联网技术计划将为下一代超宽带宽、多信道空中与太空通信网络开发基础技术。
Finally, the space Optical Networking technology project develops the technology base for the next generation of ultra-wide-bandwidth, multi-channeled, air and space-based communications networks.
首次研究白高斯噪声（AWGN）信道下超宽带无线电通信系统中单个数据包单元发射信号能量的优化。
In this paper, the optimization of the transmitted signal energy for a data packet unit in UWB radio communications in additive white Gaussian noise(AWGN) channel is firstly investigated.
在无线宽带通信系统中，信道的多径效应会严重影响通信的可靠性。
In the system of wireless broad band communication, the multi-path effect may greatly affect the reliability of the communication performance.
正交频分复用技术以其多种优势成为低压电力线宽带通信的最佳选择，信道估计是正交频分复用系统的关键问题之一。
Due to many advantages of Orthogonal Frequency Division Multiplexing technique, it becomes the best choice for low-voltage power line broadband communication.
本文首先研究了在典型室内信道下基于OFDM技术的超宽带(uwb)通信系统的性能，并提出了一种接收能量模型。
The performance of UWB system based OFDM in the typical indoor channel is studied at first, and a model of reception energy is given.
在未来宽带移动通信中，存在两个最严峻的挑战：多径衰落信道和带宽效率。
In the future broadband wireless communications, there will be two severe challenges to be faced, which are frequency selective fading channels and bandwidth efficiency.
在未来宽带移动通信中，存在两个最严峻的挑战：多径衰落信道和带宽效率。
In the future broadband wireless communications, there will be two severe challenges to be faced, which are frequency selective fading channels and bandwidth efficiency.
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