The PRFM pulse sequence is composed by 16 fixed-width and fixed-amplitude short pulses, in which the duration between two neighboring pulses is determined by pseudo-randomnumbersequence.
此序列由16个固定宽度的高电平脉冲组成，两个相邻脉冲之间的低电平时间间隔是由伪随机数序列决定的。
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Coarse channel estimates are based on a time-domain correlation of a pseudo-randomnumber (PN) sequence with linear interpolation for the fine channel estimates over an OFDM block.
This paper proposes a new RFID secure protocol which uses the mechanism that the randomsequence stored in the tag produces the pseudorandomnumber to replace the random value generator.