Pilot-based channel estimation in OFDM systems with fractional delays

1. What is pilot-based channel estimation?
2. What is channel estimation in OFDM?
3. What is pilot signal in OFDM?
4. What is channel estimation in MIMO?

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.

What is channel estimation in OFDM?

Channel estimation plays an important part in an OFDM system. It is used for increasing the capacity of orthogonal frequency division multiple access (OFDMA) systems by improving the system performance in terms of bit error rate.

What is pilot signal in OFDM?

A pilot symbol is a complete OFDM symbol where the value of each subcarrier is predefined and known in transmitter and receiver. It is repeated with a certain rate that depends on how fast the channel changes. The received signal is correlated with the pilot symbol to detect the OFDM symbol start.

What is channel estimation in MIMO?

MIMO. systems use multiple antennas to transmit and receive. signals. Channel Estimation means to estimate channel. parameters from the received signal.