Howtosignalprocessing
- How to choose subcarrier spacing for OFDM?
- What is the subcarrier spacing?
- What is flat fading channel?
- What is the space between a subcarrier and the next sub carrier in an LTE network?
How to choose subcarrier spacing for OFDM?
Subcarrier spacing is equal to the reciprocal of the symbol time. As a result of the longer symbol time, the subcarrier size and spacing decreases from 312.5 KHz to 78.125 KHz. The narrow subcarrier spacing allows better equalization and therefore enhanced channel robustness.
What is the subcarrier spacing?
The subcarriers can be spaced from 15 kHz to 240 kHz apart. In general, due to the characteristics of the channel bands, 15 kHZ to 60 kHz is used in carrier channels below 6 GHz, and 60 kHz to 120 kHz is used for higher frequency channels.
What is flat fading channel?
In flat fading, the coherence bandwidth of the channel is larger than the bandwidth of the signal. Therefore, all frequency components of the signal will experience the same magnitude of fading. In frequency-selective fading, the coherence bandwidth of the channel is smaller than the bandwidth of the signal.
What is the space between a subcarrier and the next sub carrier in an LTE network?
The LTE OFDM subcarrier spacing equals 15 kHz for both downlink and uplink.
