Up-link synchronization in OFDM system is completed by ranging.
正交频分复用系统的上行同步需要测距来完成。
Carrier frequency offset is one of the key problems in OFDM system.
载波频率偏移是OFDM系统实现的关键问题之一。
Joint ML block semi-blind channel estimation is applied to OFDM system.
将联合最大似然分组半盲估计算法应用于正交频分复用系统。
Carrier frequency synchronization is one of the key techniques of OFDM system.
载波同步是正交频分复用系统的一项关键技术。
A training guided decision feedback equalization (DFE) method was proposed for OFDM system.
针对OFDM系统，提出了一种基于训练引导的判决反馈均衡算法。
In the implementation of broadband OFDM system, FFT processor is one of the key components.
在宽带OFDM系统的实现中，FFT处理器是一个关键部分。
So the research on how to effectively reduce the PAPR of the OFDM system is quite meaningful.
因此，研究如何有效地降低OFDM系统的PAPR则具有非常重要的意义。
One of the major drawbacks of the OFDM system is the high peak-to-average power ration (PAPR).
正交频分复用(OFDM)系统的一个主要缺点是峰均功率比(PAPR)过高。
When the adaptive modulation is applied in the OFDM system, there are lots of problems to be solved.
本文围绕自适应调制技术在OFDM系统中的应用涉及的技术问题展开研究。
This thesis introduces the basic principle and key technologies of adaptive TCM based on OFDM system.
本文对OFDM中的自适应TCM的基本原理及其关键技术进行了分析。
Channel estimation is the key technique to implement OFDM system, and is also the hotspot of research.
信道估计是实现OFDM系统的关键技术之一，也是目前研究热点。
Finally, this dissertation proposes a low complexity adaptive modulation scheme for VBLAST-OFDM system.
最后，提出了一种低复杂度的VBLAST - OFDM系统自适应调制方案。
An adaptive subcarrier allocation algorithm for multiuser OSTBC-OFDM system is discussed in this paper.
研究了基于正交空时分组码的多用户OFDM系统的自适应子载波分配算法。
The methods to lower the peak-to-average power ratio (PAPR) of OFDM system are researched in the essay.
本文着重研究了降低OFDM系统峰均功率比的方法。
Channel estimation is researched for OFDM system in low-voltage power line communication in this paper.
本文主要研究基于OFDM的低压电力线通信信道估计算法。
The main contents of the paper are some channel estimation and equalization methods in MIMO-OFDM system.
本文研究的主要内容是MIMO-OFDM系统的信道估计和均衡技术。
Applying Doppler diversity in OFDM system can combat the effect of Doppler spread on system performance.
将多普勒分集技术应用于OFDM系统，可以有效地对抗多普勒扩展对系统性能的影响。
OFDM system performance is more sensitive to frequency offset and timing error than single-carrier systems.
OFDM系统中频偏和定时误差的存在，对系统性能有很大的影响。
As one of the key technologies of OFDM system, channel estimation plays a very important role in OFDM system.
信道估计作为OFDM系统的关键技术之一，在OFDM系统中扮演着非常重要的角色。
The maximum Doppler frequency shift is an important parameter which affects the performance of the OFDM system.
在OFDM系统中，影响其性能的一个重要参数就是最大多普勒频移。
In this way, the ICI and "error floor" in traditional OFDM system are removed, and the performance is enhanced.
该接收技术可以有效去除传统的OFDM系统中的载波间干扰，消除误码的地板效应，提高了系统性能。
But OFDM is very sensitive to frequency offset and phase noise, so synchronization is the key problem for OFDM system.
但是OFDM技术对频率偏移和相位噪声很敏感，所以同步是OFDM系统中的关键问题。
One of the key problems in OFDM system design is that OFDM system has high requirements about carrier synchronization.
而OFDM系统设计中的难点之一就是OFDM系统对载波频率同步的精度要求特别高。
On the base of analysis of power line channel and OFDM system, research is focused on the channel estimation algorithm.
在对电力线和OFDM系统分析的基础上，重点研究了信道估计算法。
The OFDM system is very strict in orthogonality of sub-carries, thus it is extremely sensitive to the filter group delay.
OFDM系统对子载波间的正交性要求极其严格，因此对滤波器群延时较敏感。
The estimation of the coarse frequency offset and timing is one of the key technology in the uplink multiuser OFDM system.
上行链路中的粗频偏及定时估计是多用户OFDM系统的关键技术之一。
Being one of the core MIMO techniques, the space-time code technique takes a very important status in the MIMO-OFDM system.
作为MIMO核心技术之一的空时编码技术，在MIMO -OFDM系统中具有极为重要的地位。
However, OFDM is particularly sensitive to the synchronization errors that can greatly decrease the OFDM system performance.
但是OFDM对同步偏差十分敏感，同步偏差的产生会使OFDM系统性能大大降低。
Allocation of antennas and subcarriers is one of most important issue for multiuser MIMO-OFDM system radio resource management.
天线与子载波分配是多用户MIMO - OFDM系统无线资源管理中的重要内容。
The prerequisites of normal work of OFDM system are the precise time synchronization and the accurate frequency synchronization.
精确的时间同步和准确的频率同步是OFDM系统正常工作的前提条件。
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