Cycle prefix In Wireless Communications
Wireless Communications
Cycle prefix :
The cyclic prefix means introduction of guard interval between each symbol to reduce the inter-symbol interference (ISI) caused by delay spread in the transmission channel, the CP achieved by taking a copy of the last portion of the data symbol appended to the front of the
symbol during the guard interval & this data portion must be at least 15% of the data length
As shown in the figure. The CP adds redundancy through repetition of the signal rather than by adding any new information. When the CP is added , it's guarantees that the symbol will be undistorted for at least its nominal symbol in the presence of multipath and this allows the receiver to avoid the frequency domain ICI while at the same time avoiding all time domain
ISI due to multipath. And also by adding the CP to our original signal and transmitting through the same channel, we can obtain the desired circular convolution which makes it easier to recover the signal after the FFT at the receiver.
Cyclic prefix advantages:
1- Increases transmitted power.2- Lowers symbol rate.
Disadvantages of cyclic prefix
1- Affect on data rate due to addition of redundant symbols.
2- Cause power loss due to the transmission power loss to send the redundant symbols.
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