Howtosignalprocessing
- What are pilot tones in OFDM?
- Why are pilots used in OFDM?
- What are pilot subcarriers in OFDM?
- What is pilot based channel estimation?
What are pilot tones in OFDM?
A pilot tone is certain subcarrier that is modulated with a known value in each OFDM symbol. I doubt that it can be used for synchronization. A pilot symbol is a complete OFDM symbol with predefined content. It can be used for synchronization.
Why are pilots used in OFDM?
In each OFDM symbol, four of the subcarriers are dedicated to pilot signals in order to make the coherent detection robust against frequency offsets and phase noise.
What are pilot subcarriers in OFDM?
Pilot Subcarriers: The pilot subcarriers do not carry modulated data; however, they are used for synchronization purposes between the receiver and transmitter.
What is pilot based channel estimation?
Pilot-based channel estimation estimates the channel information by obtaining the impulse response from all sub-carriers by pilot. Compared with blind channel estimation, which uses statistical information of the received signals, pilot-based channel estimation is a practical and an effective method.
