本文对基于叠加导频的信道估计方法进行研究。
In this thesis, we study the channel estimation methods based on the superimposed pilots.
提出一种使用矩形导频图案的OFDM信道估计方法。
A channel estimation method for OFDM systems using rectangular pilot pattern was proposed.
纯导频方式是采用专门的信道发生器模拟出纯粹的导频信号。
The way of pure pilot-frequency is one that adopts dedicated-channel generator to simulate pure pilot signal.
最后利用前导和判决反馈导频估计的结果联合完成信道估计。
And then the whole channel estimation is accomplished by channel estimation results of preamble training sequences and decision feedback pilots.
接下来，用LS估计插在OFDM数据符号中规则的导频符号。
Next, LS scheme is also applied on the regular pilot tones which are inserted OFDM data symbol.
盲估计不需要导频符号，直接利用接收的信号对信道进行估计。
Blind estimation dose not need the pilots and USES the received signal to estimate the channel state information.
利用导频符号进行信道估计，并作为空间波束成型器的参考信号。
The pilot symbols were used to estimate channel and act as reference signal of beam-former.
根据该导频的特性，提出了一种改进的频域最小二乘信道估计算法。
Based on characteristics of the proposed pilot, an improved frequency domain least squares channel estimation method is proposed.
信道估计器通常分为两类：判决反馈估计器和导频符号辅助估计器。
Channel estimators are usually divided into two kind: decision-feedback estimator and pilot-aided estimator.
本文主要研究了无线OFDM系统中基于导频的时变信道估计方法。
This thesis mainly focuses on the time-varying channel estimation methods based on pilot tones in wireless OFDM systems.
从接收机复杂度和性能要求出发，导频辅助估计器为较常用的方法。
The latter is in common use while considering the complexity of the receivers and performance of the systems.
在初始阶段， 通过设计导频序列，以实现帧级的捕获和脉冲级跟踪；
In the initiation phase, a pilot symbol sequence designed is capitalized to assure frame-level acquisition and pulse-level tracking.
利用导频符号进行权向量更新算法，并作为空间波束成型器的参考信号。
The pilot symbols were used to estimate channel and acted as reference signal of beam-former.
本论文主要针对这个关键技术及相关的最优导频序列设计问题进行了研究。
This thesis focuses on this topic and the corresponding design issue of the optimal pilot sequence.
在数字基带处理时，从正常载频信道中提取出导频信号，用于伪导频的发射。
When processing digital base-band, the signal of pilot-frequency was taken out from normal carrier channel and it would be used for transmitting pseudo pilot-frequency.
综合起来，我们认为纯导频方式对网络影响小，适合在基站密集的地区使用。
Comprehensively speaking, we believe the approach of pure-pilot has a small impact on the network, so it is suitable for using in areas which deploy dense base-stations.
本文提出，若系统中有自适应横向均衡器，均衡器能兼起抑止导频干扰的作用。
In this paper, it is proved that if there is an adaptive transversal equalizer in the system, the equalizer can also reject the pilot interference.
为了使前馈功放具有自适应能力，设计了一种基于单片机实现的导频前馈功放。
In order to get the adaptive ability for the feed-forward power amplifier, this paper presents a design of feedforward power amplifier based on pilot signal with a single-chip microcomputer.
然后主要研究了信道估计的两种方法：第一种方法是基于导频的信道估计方法。
Then channel estimation is studied two key ways:The first method is based on pilot channel estimation method.
经过推导可以证明，此时导频序列的设计与求解一个约束不等式方程组是等效的。
It can be shown that such a design issue is equivalent to solving a system of linear inequalities.
无线OFDM系统中基于导频辅助的信道估计必须折衷考虑算法性能与算法复杂度。
The tradeoff between performance and complexity must be taken into account in channels estimation algorithm of wireless OFDM systems.
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.
方案利用时频联合估计来得到可靠的信号检测，并从导频符号估计时间和频率偏移。
Based on joint time and frequency offset estimation, a reliable signal detection scheme is obtained by modulated pilot symbols using an m-sequence.
根据算法的特点，信道估计可大致分为三类：基于导频辅助的估计、盲估计、半盲估计。
According to the characteristics of various algorithms, we can classify them into three types: pilot-assisted channel estimation, blind and semi-blind estimation.
同时，均衡器34B正使用例如来自下一调度用户的导频训练以用于下一调度用户的信号。
At the same time, the equalizer 34b is training to the next scheduled user's signal using, for example, the pilot from the next scheduled user.
研究结果，也即两层传输时的专用导频图案，也可以作为更高阶传输时专用导频设计的基础。
The research method can be extended to higher rank transmission, and the research result can also be regarded as the basis for higher rank design.
在公众CDMA蜂窝移动通信网中，导频污染是影响网络服务质量和系统容量的一个重要原因。
Pilot pollution is one of the key problems in public CDMA mobile network, which affects the service quality and capacity of network.
分析了利用导频同步跟踪的性能，以及提出了一个数值方法确定最优环路参数以最小化误码率。
The performance of synchronization tracking using pilot is analyzed, followed by a numerical method to determine the optimal lock loop parameters to minimize average bit error rate (BER).
通过导频控制器的输出电压控制热敏电阻，从而改变调节网络的增益，达到稳定传输电平的目的。
The output voltage of controller exerts an influence on thermal resistor so as to change gain characteristic in regulation circuit, thus the transmission levels being stabilized.
通过导频控制器的输出电压控制热敏电阻，从而改变调节网络的增益，达到稳定传输电平的目的。
The output voltage of controller exerts an influence on thermal resistor so as to change gain characteristic in regulation circuit, thus the transmission levels being stabilized.
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