提出一种适用于LEO(低轨道)星座通信系统的信道分配方案。
A channel assigning scheme which was adapted to LEO constellation communication system was proposed.
该算法利用信道的时间平均相关取代统计相关，结合了基于特征值分解的低秩建模，从而近似地实现MMSE估计。
This algorithm utilizes time-average channel correlation matrix in place of exact channel correlation matrix and approximates the MMSE estimator by a low-rank structure.
相对于一般的通信系统而言，低轨卫星通信系统具有信号动态范围大，多普勒频移大且变化速度快，信道起伏剧烈等特点。
LEO satellite communication system has the properties of larger power dynamic range, larger and faster changed doppler frequency shift and rapid fluctuation compared to ordinary communication system.
实现低延迟、因特网类型的数据通信需要特别设计分组数据信道。
Achieving low-latency, internet-type data communications requires specially designed packet data channels.
另一方面，无线信道高误码率、低带宽、传输抖动剧烈和带宽不稳定等因素，对实时流媒体应用构成了挑战。
On the other hand, the dynamic fluctuated bandwidth, higher error rate and sharp delay jitter on wireless channel cause trouble to the real-time demand of streaming services.
深空通信中面临的问题之一就是如何在低信噪比信道环境下可靠地传递信息。
In deep space communications, one of the problems is how to transmit message credibly in low signal-to-noise ratio (SNR) channel environment.
视频序列的时域亚采样对于低比特率信道上的视频传输和存储空间受限条件下的视频存储具有十分重要的意义。
The temporal sub-sampling technique of the video sequence is very important for the video transmission in the low-bit-rate channel and the video storage in the limited storage space.
利用该算法，作者实现了B超视频在低带宽信道中的实时传输。
Using this arithmetic, the author has reached the real-time transmission of B-ultrasonic video through narrow bandwidth channel.
设计中采用了DSP、低比特率语音压缩编解码、信道复用、快闪存储、串口和调制解调器通信等技术。
In this design many technologies such as DSP, low bit-rate speech compression, channel multiplexing, Flash Memory and communication with modem through se rial port are used.
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.
大数据量的视频信息传输与网络信道低传输速率的矛盾，使得视频通信成为多媒体通信的关键。
A key of multimedia communication is the video communication due to the contradictory between the enormous data of video information transmitted and low transmitted rate in channel of network.
论文研究了基于多径时延跟踪的信道估计方法，并提出了一种低复杂度的多径时延跟踪方法。
We investigate the channel estimation algorithms based on tracking multipath time delay, a low complexity multipath time delay estimation method is proposed.
手机上已经存在一个低延迟的数字数据路径—用于语音的线路信道。
Cell phones already have a very low latency digital data path - the circuit switched channel used for voice.
该方案保密性强，信道传输量低。
The scheme has high quality of secrecy and low channel transmission amount.
仿真结果表明，在低信噪比的多径信道下，该算法可通过选择合适的训练符号，使错检概率低于常规算法。
The simulation results indicate under multipath channel for low SNR, the new algorithm has lower probability of failure than the conventional algorithm by adopting proper training symbols.
低轨卫星的信道与地面无线信道具有不同的特点，低信噪比与大多普勒频移是低轨卫星信道的两个显著特征。
The channel of LEO satellite is different from wireless channels on the ground. Low SNR and large Doppler shift are the two characteristic of LEO satellite channel.
测试低轨卫星移动通信信道模拟器的硬件性能。
Test the specification of the LEO satellite communication channel simulator.
很多国家在建立了低轨卫星系统的同时，进行了卫星信道模拟器的研究。
Many countries get to research satellite communication channel emulator while building up low-orbiting satellite communication system.
针对具有点波束的低轨卫星移动通信系统，提出了一种信道动态预留策略。
A dynamic channel reserve strategy for LEO communication system with spot-beam is proposed.
为解决无线网络中长传播时延所带来的信道资源利用率低的问题，提出一种基于快速预约按需发送（FRODT）的媒质接入控制（MAC）协议。
To solve low channel utilization problem caused by long propagation delay in wireless networks, a fast reservation on-demand transmission (FRODT) medium access control (MAC) protocol is proposed.
通过仿真表明，这种低复杂度的TTCM迭代均衡译码系统的性能可接近于高斯信道下ttcm系统的性能。
Computer simulation results show that the novel low-complexity receiver on the fading channel can achieve comparable performance with TTCM on the Gaussian channel with coding.
在联合信源信道迭代译码器中，信源变长译码采用基于麻花辫网格的低复杂度变长译码算法进行译码。
In a joint source-channel iterative decoder, the source variable length decoding adopts the lower complexity variable length decoding algorithm based on the twist braid grid to decode.
它用来对于信道传输中产生的频率偏移和相位偏移进行补偿，是提高传输的准确性和低误码率的有效的手段。
It compensate the frequency error and phase error caused in channel. It is the good method of improvement of transport veracity and lower fault code rate.
其次，本文对低轨卫星移动通信信道模型进行了详细的分析。
Secondly, this paper gives a detail analysis for mobile communication channel model of low-orbit satellites.
这些都将为下一步在硬件平台上实现低轨卫星移动通信信道模拟器奠定了基础。
All these will afford more detailed theoretical basis for further studying and simulating low-orbit satellite mobile channels simulator in the hardware platform.
同时，针对梳状导频ls信道估计精度较低的情况，提出了通过时域低通滤波提高其估计精度的IPF -LS和IDF - LS改进算法。
Meanwhile, given the weak accuracy of LS algorithm, IPF-LS and IDF-LS are proposed which can enhance the accuracy of channel estimation by employing time-domain low-pass filter.
通过对比几种典型的信道分配算法，结合低轨卫星系统自身的特点设计了一种自适应信道分配策略。
By comparing several typical channel assignment algorithms, combined with its own characteristics of LEO satellite systems, an improved adaptive channel allocation strategy was designed.
然而，在低信噪比区间，且已知信道状态信息时利用自适应注水功率分配算法，信道相关性对信道容量具有提升作用。
However, when the channel information at the transmitter is known and the self-adaptive water-filling power allocation algorithm is used, the channel correlation may lead to higher channel capacity.
然而，在低信噪比区间，且已知信道状态信息时利用自适应注水功率分配算法，信道相关性对信道容量具有提升作用。
However, when the channel information at the transmitter is known and the self-adaptive water-filling power allocation algorithm is used, the channel correlation may lead to higher channel capacity.
应用推荐