Cyclic prefix: its role in reducing inter-symbol interference

[bitheerani319]

While the spacing of subcarriers ensures orthogonality, cyclic prefix insertion also plays an important role in OFDM systems by reducing intersymbol interference (ISI) caused by multipath propagation and channel delay spread.

Cyclic prefix, which is a copy of the spain mobile database of the OFDM symbol placed in front, creates a guard period that absorbs the delay component of multipath propagation.

This technique effectively eliminates ISI, maintains signal integrity, and facilitates channel equalization at the receiver.

Peak-to-Average Power Ratio (PAPR) and its effects
Peak-to-average power ratio (PAPR) is a major challenge in OFDM systems as the combination of multiple subcarriers can result in high signal peaks compared to the average power level.

This phenomenon has several implications:

Want to extend the signal with higher features
Reduced energy efficiency
Signal distortion and out-of-band radiation may occur.
Increased complexity in analog-to-digital and digital-to-analog conversion circuits
These effects necessitate careful system design and the use of PAPR reduction techniques to preserve OFDM's performance advantages while minimizing its associated disadvantages.