Because high-speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed.
由于高速数据占用更宽的带宽，所以在调制制式上应该寻找一种适合于跳频通信特点的具有高频谱效率的调制方案。
On account of the wide relative bandwidth, compared with the narrow-band system, large-band SAR system errors impose more severe effect on imaging quality.
由于相对带宽很大，与窄带系统相比，宽带SAR系统误差对成像的影响更严重。
A method of designing linear frequency modulated (LFM) signals with wide bandwidth and an experimental system that can generate many complex waveforms are presented.
文中不仅给出了宽带线性调频(LFM)信号的具体设计方法，而且给出了可产生多种复杂波形的实验信号产生系统及其主要技术指标。
OFDM technology has been used in various high speed wide bandwidth wireless system.
正交频分复用(OFDM)技术已经广泛应用于各种高速宽带无线通信系统中。
Therefore, a single compact antenna that has an impedance bandwidth wide enough to cover the operating frequency bands of the multi-band wireless communication system is more desirable.
对于这种无线多频通信系统来说，具有紧凑结构并能覆盖这些通信频段的带宽的天线是人们所希望的。
The wide band radio transmission may be implemented in two parallel ways: to design a new system with larger bandwidth; to construct a cooperative system based on existing systems.
大带宽无线传输有两个实现途径，一是设计频带更宽的单一系统，一是进行不同系统间的协同设计。
To utilize the properties of ultra-wide bandwidth, the structure of ultra-wide bandwidth digital radio-on-fiber system was modified, and the system model was illustrated.
为了充分利用超宽带的特点，对数字光载无线系统进行了改进，并给出了系统模型。
The system should have the performance of multi frequency and wide bandwidth, in order to meet the number of user growing, so the multi frequency of HSDPA terminal products will be the hotspot.
根据现有已推出HSDPA终端产品的公司对适用于HSDPA数据卡工作频率的一般要求，本论文研究了适用于HSDPA数据卡的多频（五频）天线。
The system should have the performance of multi frequency and wide bandwidth, in order to meet the number of user growing, so the multi frequency of HSDPA terminal products will be the hotspot.
根据现有已推出HSDPA终端产品的公司对适用于HSDPA数据卡工作频率的一般要求，本论文研究了适用于HSDPA数据卡的多频（五频）天线。
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