The increasing of symbol duration makes OFDM more robust against multipath transmission, whereas, it makes OFDM more sensitive to the time varying of wireless mobile channels.
符号时间的增加，使得OFDM系统具有良好的抗多径性能，但同时也使OFDM系统对于无线移动信道的时变性更加敏感。
Each pilot sub - carrier signal is placed at a different sub-carrier signal location for each successive symbol duration of the OFDM signal to form a sliding pilot sub-carrier signal.
对于OFDM信号的每个连续符号持续时间，每个导频子载波信号放在不同的子载波信号位置，以形成滑动导频子载波信号。
Reducing the data rate by one-half will double the duration of each symbol interval.
把数据率减少一半，就能使每一符号间隔的持续时间延长一倍。
Transmitting the data half as fast for given bandwidth will double the duration of each symbol interval.
在给定带宽条件下，将数据传输速度减慢一半，就能使每一个符号间隔的持续时间延长一倍。
For example, in Morse code the dots and dashes of a character are separated by an inter character space, which is three times the duration of an inter symbol space.
例如，在莫尔斯电码中，字的点、划是由符号间的空格来分开的，而字符之间又是由字符间的空格分开的，字符间空格的时长是符号间空格的三倍。
For example, in Morse code the dots and dashes of a character are separated by an inter character space, which is three times the duration of an inter symbol space.
例如，在莫尔斯电码中，字的点、划是由符号间的空格来分开的，而字符之间又是由字符间的空格分开的，字符间空格的时长是符号间空格的三倍。
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