CP Length (LTE)
Auto
Auto, Normal, or Extended
specifies the cyclic prefix mode for non-MBSFN subframes and the non-MBSFN region of MBSFN subframes. The length of the cyclix prefix can be autodetected or can be specified as Normal (CP 1) Contention period, or 2) Cyclic prefix length = 7.03125% the length of the symbol), or as Extended (CP Length = 25% the length of the symbol). The current CP length mode is shown in the Error Summary trace.
The cyclic prefix is added by the transmitter to each OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. symbol by appending a copy of the last 7% (or 25% for extended CP) of the OFDM symbol to the front of the OFDM symbol. The addition of the CP allows time for all the paths in a multipath environment to arrive at the receiver before the symbol is demodulated.
See Symbol Timing Adjust for information about setting the location of the symbol FFT Fast Fourier Transform: A mathematical operation performed on a time-domain signal to yield the individual spectral components that constitute the signal. See Spectrum..
See Also
