OFDM systems can work in either continuous mode or burst mode.
OFDM系统可分为连续工作模式和突发工作模式。
Channel estimation technique is one of the key techniques in OFDM systems.
信道估计是OFDM系统中的关键技术之一。
So it is necessary to study the channel estimation method of MIMO-OFDM systems.
因此，有必要对MIMO - OFDM系统的无线信道估计方法进行研究。
Demodulation performance of OFDM systems can be improved after CFO is compensated.
将跟踪到的频偏补偿后，提高了系统解调性能。
Channel estimation is an important part for OFDM systems performing coherent detection.
而信道估计是相干检测的OFDM系统的重要组成部分。
A channel estimation method for OFDM systems using rectangular pilot pattern was proposed.
提出一种使用矩形导频图案的OFDM信道估计方法。
The methods propose to utilize the zero padding prefix(ZP) characteristic of ZP-OFDM systems.
提出一种在零前缀正交频分复用（ZP-OFDM）系统中，估计符号定时和载波频偏的算法。
Frequency offset tracking is one of the key technologies that affect OFDM systems' performance.
频偏跟踪是影响到OFDM系统性能的关键技术之一。
A new technique is proposed to cancel the clipping noise on pilot symbols for clipped OFDM systems.
本文针对限幅OFDM系统，提出一种基于导引符号的限幅噪声消除算法。
Capacity of the MIMO-OFDM systems using both space diversity and polarization diversity was analyzed.
结合空间分集和极化分集，对MIMO - OFDM系统中的容量进行研究。
For pulse shaping OFDM systems for doubly dispersive channels, such a setup is in general not optimal.
对于双弥散信道的OFDM系统，这种设计的脉冲成形一般不是最理想的。
The rules can effectively use multi-user diversity to improve V-BLAST/OFDM systems' performance greatly.
该准则可以有效地利用多用户分集，明显提高V-BLAST/OFDM系统的整体性能。
The timing synchronization algorithm of training symbols for the OFDM systems is an old timing algorithm.
OFDM系统的训练符号定时同步算法是一种传统的定时算法。
OFDM systems contain more than one orthogonal sub-carrier, so it is different from single carrier systems.
与单载波系统相比，OFDM系统存在多个正交子载波。
In this paper, the key techniques of OFDM systems, such as equalization and channel estimation are studied.
本文主要研究了OFDM的信道估计和均衡等关键技术。
This dissertation investigates the topic of time and frequency synchronization for OFDM and MIMO-OFDM systems.
准确的时间同步和精确的频率同步是OFDM系统和MIMO OFDM系统正常工作的前提。
Synchronization and channel estimation are two key techniques for OFDM systems to ensure its good performance.
为保证其具有好的性能，需要时频同步、信道估计等一系列的关键技术加以支持。
Based on the Wiener noise, the influence of main parameters of OFDM systems on the ICI and systems is discussed.
针对维纳相噪，深入研究了OFDM系统中各主要参数对ICI和系统性能的影响。
A combined channel estimation method of time-frequency-selective fading channels in MIMO-OFDM systems was proposed.
提出了一种适用于时间频率选择性衰落信道的MIMO - OFDM系统的组合信道估计方法。
A novel symbol synchronization and carrier frequency offset estimation method is presented for 39-tone OFDM systems.
针对短波39音OFDM系统，提出了一种新型的符号同步和载波频偏估计方法。
At present, the channel estimation of wireless OFDM systems has been still in the progress of research and exploring.
目前，对于无线OFDM系统的信道估计方法仍处于研究和探索阶段。
Meanwhile, the orthogonality of OFDM systems has become very fragile and the impact brought by ICI will not be ignored.
此时，OFDM系统的正交性变得十分脆弱，ICI的影响将不可忽视。
This thesis mainly focuses on the time-varying channel estimation methods based on pilot tones in wireless OFDM systems.
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。
Secondly, the timing synchronization algorithm for OFDM systems and frequency synchronization algorithm were researched.
其次对OFDM系统的定时同步算法和载波频率同步算法进行研究。
The basic thought is to apply the existing blind source separation (BSS) algorithm to the signal detection in MIMO-OFDM systems.
基本思想是将现有的盲信源分离算法(BSS)应用到MIMO - OFDM系统的信号检测中。
The tradeoff between performance and complexity must be taken into account in channels estimation algorithm of wireless OFDM systems.
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。
Time-domain equalizer (TEQ) is an effective technique to combat ISI caused by inadequate circular prefix (CP) length in OFDM systems.
在OFDM系统中，时域均衡器用来抵消因循环前缀长度不足而引起的码间串扰。
Secondly, the power allocation and subcarrier pairing for cooperative OFDM systems were researched and the outage proformance was analysed.
研究协作OFDM系统的功率分配和子载波配对，并分析系统的中断性能。
Secondly, the power allocation and subcarrier pairing for cooperative OFDM systems were researched and the outage proformance was analysed.
研究协作OFDM系统的功率分配和子载波配对，并分析系统的中断性能。
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