跳频方案采用软件无线电技术，采用DSP作为伪码发生器，控制DDS输出频率，得到相应的跳频图案。
The frequency hopping system based on software radio, DSP is used to generate quasi-stochastic sequence and control the output frequency of DDS to construct required hopping maps.
其次，我们对适合频率选择性衰落信道的空频码提出了一些独创性的想法。
We derive the condition of the space-frequency codes to achieve maximum achievable diversity gain.
识别与重构系统是一个相对封闭的系统，为了增强它与指挥者的互动性，本文设计并实现了伪码的频率检测系统。
The recognition and reconstruction system is blocked by itself. To communicate with the commander, frequence detection and showing system have been designed .
通过对改进素数码的不同脉冲位置赋予不同的频率，提出了一种新的跳频扩时码。
A novel frequency time spreading code by designating the different frequencies to the different mark positions of the modified prime code is proposed.
二相码信号广泛地应用于雷达系统，文中针对其对多普勒频率敏感的问题提出了一种补偿算法。
For binary phase-coded signal sensitive to Doppler frequence, a new compensation algorithm is introduced in this paper.
伪码调相-载波调频复合信号的识别特征包括伪码特征和频率调制特征。
The features of pseudo code PM-carrier FM combined signal include the pseudo code and the modulation frequency.
由于反馈器件的限制，高速伪码不能采用单独依赖提高时钟频率的方法。
Because of the limits of feedback devices, high speed pseudo noise code generation cannot depend simply on the improvement of clock rate.
家电产品的托盘货物单元采用多层堆码时，各层货箱的共振频率不同于单一货箱的。
The resonance frequency of cargo boxes on each floor is difference with single cargo of box when household appliance pallet units are in multi-layer stacking.
考虑多普勒频移的影响采用频率和码相位二维搜索。
Considering the affection of Doppler, the two dimensions searching in both frequency and code phase is applied.
GPS接收机中信号捕获通过粗略调整本地复制信号的码相位和载波频率与卫星信号同步。
In a GPS receiver, the signal acquisition coarsely adjusts the code phase and the carrier frequency of locally generated replicas to align with the corresponding satellite signal.
针对低莱斯因子信道中衰落和码间干扰的影响，提出了带内三重频率分集接收实现方式，给出了采用带内三重频率分集的调制器和解调器的原理框图。
For the influence of fading and ISI on low Rice factor channel, the system adopting diversity technology is presented, and the schematic diagram of the modem adopting diversity technology is given.
带红外线遥控，可对音响和各种音柱任意遥控设置音量、地址码、频率。
With the infrared remote control, it can set the volume, address code, frequency for the various column loudspeakers willful remote control of the sound.
定时偏差会导致码间干扰，频率偏差会破坏子载波间的正交性，引起子载波间干扰，从而使系统整体性能急剧下降。
Timing offset causes inter-symbol interference, and frequency offset would destroy the orthogonality between subcarriers, causing ICI, which lead to a sharp decline in overall system performance.
外型美观大方、音质优美清晰。带遥控功能，可用遥控设置音箱的频率、地址码、音量。
Elegant and stylish appearance, graceful and clear acoustic quality, with the remote control function, you can use the remote control to set the sound box frequency, address code and volume.
本文提出了频率选择性瑞利衰落信道中的对角空频分组码(DSF)，研究了码的性能。
In this paper, we propose a diagonal space-frequency (DSF) block codes over frequency-selective Rayleigh fading channels and study performance of the code.
利用直接频率合成技术产生高精度、高稳定度的扩频伪码时钟。
The direct digital synthesis (DDS) is adopted to generate the pseudo-random code clock having high precision and stability.
利用快速四阶循环累积量算法、时频脊线分析与小波变换相结合的方法，实现了跳频频率和码速率等参数的高精度估计。
They are used to yield accurate estimation for the hop frequencies and hop rate, which are fast 4th-order cyclic cumulants algorithm, time-frequency backbone curve analysis, and wavelet transform.
介绍了空时码在频率非选择性慢衰落信道下各种设计准则的推导过程，并对几种现有空时码进行了性能分析和比较。
This paper analyzed the impact of fading correlation on the noncoherent unitary space-time code, deduced the pair-wise error probability(PWEP) and Chernoff bound under fading correlation.
载波跟踪环用于对接收信号的载波频率进行精确跟踪，而码跟踪环是用于实现伪随机码延时的精确对准。
The former is used to achieve the fine estimation of the carrier frequency while the later is used to achieve the fine estimation of the code delay of the PRN code.
载波跟踪环用于对接收信号的载波频率进行精确跟踪，而码跟踪环是用于实现伪随机码延时的精确对准。
The former is used to achieve the fine estimation of the carrier frequency while the later is used to achieve the fine estimation of the code delay of the PRN code.
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