前者是通过对载波信道的频率特性时变性测试、分析，实现信号平稳传输。
The former realizes steady transmission of signal by testing and analysing the carrier channel's frequency characteristic .
信道n（n为0...78）使用的载波频率为2402+nMHz。
Channel n (where n is 0...78) uses a carrier frequency of 2402+n MHz.
本文研究了自适应正交多载波频分复用（AOFDM）中根据估计出的信道特性选择调制方式的问题。
The problem of how to choose the constellation size based on the estimated channel qualities in AOFDM systems is addressed in this paper.
第二种方法是基于虚拟子载波的子空间盲信道估计方法。
The second method is based on the virtual sub-carrier subspace blind channel estimation method.
本文根据OFDM系统特点，分析了OFDM系统的时域载波频率捕获和信道估计方法。
We propose new carrier frequency acquisition and channel estimation algorithms based on the time-domain analysis of OFDM system.
低压电力线信道特性是设计低压电力线载波通信系统的基础。
The characteristics of power line channel are the foundation of designing the low voltage power line carrier communication system.
为克服低压电力线信道的频率选择性和时变性，系统采用正交多载波方式传输信息。
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
在基于频域导频的信道估计中，研究了导频子载波处的信道估计方法和数据子载波处的信道估计方法。
In the frequency domain pilot channel estimation, this thesis studies the pilot subcarrier and data subcarrier channel estimation algorithms.
模拟结果表明，该方法比一般的载波干扰比功率控制方法性能更优，可获得更低的误码率和更高的信道容量。
Compared with conventional power control method utilizing carrier to interference ratio, the simulation results show that it can achieve lower bit error ratio and higher channel capacity.
对于多载波系统，载波频率的偏移会导致子信道之间产生干扰。
The offset of carrier frequency can cause interference between subchannels in a multicarrier system.
为了增加信道容量，载波频段不断地向高频方向移动。
In order to increase the capacity of channel, the frequency of carrier wave moved to higher endlessly.
基于连续OFDM符号上的导频子载波，给出了联合频率偏移纠正和信道估计方法。
In this paper, the pilot subcarriers on two consecutive OFDM symbols are utilized for joint frequency offset correction and channel estimation.
通过在阵列天线多载波ds - CD MA系统下构造统一的信号模型，实现了基于子空间的信道盲估计。
By unified signal model of antenna array Multicarrier DS-CDMA system, the subspace-based blind channel estimation is achieved.
模拟结果表明引入子载波分组后系统性能依然保持良好，并且信道估计偏差对本算法的影响较小。
Simulation results show that subcarrier grouping just has a little influence on system performance. Meanwhile the imperfect channel estimation has little effects on the present algorithm.
数字传输系统的关键在于载波同步和信道均衡。
The key of digital transmission system lies in carrier synchronization and channel equalization.
有关OFDM的关键技术，如载波同步、信道估计、相位噪声等，在理论和实践方面均取得了很显著的成果。
Significant results in the key technologies of OFDM, such as carrier synchronization, channel estimation, phase noise and so on have achieved in theory and practice.
介绍低压电网的信道模型，提出一种基于扩频载波技术的线缆调制解调器的设计思想及其构成。
This paper discusses the channel model of low voltage electricity networks and provides a design idea and the construction of cable modem which using spread spectrum carrier technology.
本系统还运用电力载波通信芯片(将信道改为电话线路)实现了数据远程通信。
This system use electric power carrier wave communication chips, the channels between which are changed to telephone lines, to realize the long-distance communication of data.
算法根据多径信道选择性衰落的特性，结合查表法和拉格朗日乘子的混合迭代搜索法，最优地分配各个子载波的传输比特数。
Based on the characteristic of multi-path frequency selective channel, the algorithm combines rapid table lookup and Lagrange-multiplier method to iteratively search the optimal bit allocation scheme.
对码率2 / 3格形编码的8DPSKOFDM在时间色散信道中的误码率性能进行了分析和模拟，讨论了不同正交载波数情况下格形编码的设计。
The BER performance of rate 2/3 trellis coded 8DPSK OFDM over time dispersive channels is simulated. The design of trellis codes at different carriers numbers of OFDM is discussed.
本文首先介绍了多输入多输出技术和多载波复用技术，讨论了无线信道的特点。
In the paper, firstly the multiple-input-multiple-output technology and the multiple carriers multiplexing technology are discussed. Also the characters of wireless channels are introduced.
与传统的单载波调制方式相比，OFDM技术可以有效地抵抗信道多径干扰，提高系统的传输速率。
Compared with the traditional scheme of single-carrier modulation, OFDM technology has more effective anti-jamming ability and achieves higher transmission rate.
频域均衡作为关键技术不仅运用于DS- CDMA系统，而且也运用于多载波cdma (MC - CDMA)系统中来克服信道的频率选择性。
Moreover, FDE has been adopted as a key technique for both DS-CDMA and multi-carrier (MC -) CDMA to overcome the channel frequency-selectivity.
另一种方法是对公共载波调频或调相的方法发送并列信道的组合数字信号。
An alternative method is to transmit the combined digital signal from the parallel channels by frequency or phase modulation of common carrier.
利用物理层的信道状态信息，该算法将物理层（PHY）的子载波分配同数据链路层（DLL）的数据包业务调度结合起来。
This algorithm combined sub-carrier allocation in the physical(PHY) layer with traffic scheduling at the data link layer (DLL) by employing the channel state information.
本文实现了基于BWP08、BWP16电力线载波模块的有线信道的通信；
The following are realized in this paper: communication of the channel based on power line carrier modules BWP08 and BWP16;
本文重点对单载波频域均衡(SC -FDE)传输方案中的信道估计和频域均衡算法进行了研究。
In this paper, channel estimation and FDE algorithm in the SC-FDE system are mainly studied.
接着，本论文对OFDM和多载波cdma的系统结构进行了讨论，对多载波cdma系统中的导频信道估计技术进行了深入研究。
Next, the system structure of OFDM and multi-carrier system are discussed, followed by the pilot based channel estimation for the multi-carrier CDMA systems.
配电网电力线载波自动抄表系统的设计与配电网信道的特性密切相关。
The design of AMR system is related with the channel characteristics of power distribution networks.
一般多载波调制技术的主要特性是将一定宽频信道分解成为一组多个窄频信道。
The term multicarrier modulation includes a number of transmission schemes whose main characteristic is the decomposition of any wideband channel into a set of independent narrowband channels.
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