导频技术可以有效地提高不同载频之间切换的成功率，在网络优化中广泛应用，比较常用的是伪导频，实现方式有基站自提供方式；纯导频方式；易频方式。
The pilot symbols will increase the PAPR of OFDM signal in some cases.
如果导频符号的取值选取不当,将会增大OFDM信号的PAPR。
参考来源 - OFDM与SCFirstly, the paper reviews the most likelihood estimation algorithm (ML) which is based on the CPICH in WCDMA.
论文首先详细论述了基于WCDMA导频信道的最大似然估计算法(ML)。
参考来源 - WCDMA直放站中频率估计和数字预失真算法研究与实现The threshold of QAM under constant BER decision of the square QAM was given. we put forward to the special implementation architecture for pilot Signal-to-Noise estimator by utilizing the MAP channel estimated algorithm.
运用MAP信道估计算法,提出了一种导频信噪比估计器的具体实现结构。
参考来源 - 星上自适应、软件化调制技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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.
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.
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.
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