Howtosignalprocessing
- Why do we use cyclic prefixes?
- What is the relationship between the number of guard band carriers and the cyclic prefix length?
- What is cyclic prefix and what are the advantages of OFDM?
- What is difference between normal and extended cyclic prefix?
Why do we use cyclic prefixes?
Cyclic prefix is inserted to avoid intersymbol interference due to the multipath channel. In practice, CP-OFDM modulator is implemented via the computationally efficient fast Fourier transform (FFT).
What is the relationship between the number of guard band carriers and the cyclic prefix length?
The guard band has nothing to do with the cyclic prefix. This is purelly allocation of null subcarriers at the edge of the OFDM symbol which provide buffers between consecutive OFDM symbols to protect the integrity of transmitted signals by reducing intersymbol interference.
What is cyclic prefix and what are the advantages of OFDM?
The cyclic prefix allows a OFDM transmitter receiver pair to accomplish to important objectives, provided that the length of the multipath channel is less than or equal to the length of the cyclic prefix plus one: 1) it eliminates interblock interference, and 2) it enables easy equalization, as for the remainder of the ...
What is difference between normal and extended cyclic prefix?
The normal CP length is designed to support propagation conditions with a delay spread up to 4.7 μs, while the extended CP is intended to support deployments where the delay spread is up to 16.7 μs.
