The model of the MIMO-OFDM system in doubly-selective channels is derived and a lower bound of mean squared error(MSE) of the channel estimator using frequency domain pilot is presented.
基于双衰信道的频域响应，提出了一类双衰信道下多天线正交频分复用（MIMO-OFDM）系统的最优化频域导频设计方案。
Second, channel estimation algorithms of two-hop OFDM cooperative communication system with single relay are discussed, which are mainly based on block pilot.
其次，讨论了两跳单中继多载波协同通信系统的信道估计的问题，主要是基于辅助块状导频的方法；
The scheme USES pilot symbols to estimate the channel and improves the bit error performance of the system.
该方案使用的导频符号来估计信道，并提高了系统的误码性能。
An SIR-based close loop power control algorithm is presented. The pilot symbols of control channel in DS-CDMA up-link system are used to measure the received SIR.
针对采用专用控制信道的DS - CD MA系统的上行链路，本文直接利用控制信道的导频符号进行SIR测量的闭环功率控制，并通过计算机仿真对链路的性能进行分析。
The MIMO-OFDM channel estimation method is researched based on the system design, and a space-frequency domain optimal pilot-tones design algorithm is presented.
从系统设计角度研究了MIMO-OFDM系统的信道估计方法，提出一种基于空频域的最优导频设计算法。
The structure of the forward pilot channel and the basic principle of search window in CDMA2000 system is analyzed.
分析了CDMA2000中前向导频信道的结构和搜索窗的基本原理。
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.
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。
First, the channel estimation technique in SISO-OFDM system is investigated, with the emphasis on decision-directed channel estimation methods and pilot-symbol-aided channel estimation methods.
首先讨论了SISO - OFDM系统的信道估计方法：面向判决的信道估计和基于导频的信道估计。
First, the channel estimation technique in SISO-OFDM system is investigated, with the emphasis on decision-directed channel estimation methods and pilot-symbol-aided channel estimation methods.
首先讨论了SISO - OFDM系统的信道估计方法：面向判决的信道估计和基于导频的信道估计。
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