For those familiar with the liquid-dsp library, or with OFDM in general, I am hesitating what subcarrier allocation should I use in a particular wireless system.
By subcarrier allocation I am refering to how many null subcarriers, pilot subcarriers and data subcarriers should I use, and in what order. Let's say that the total number of subcarriers is forced to be 64, due to channel bandwidth limitations.
How is this related to the perfomance of the system?
The liquid-dsp library provides a default subcarrier allocation, but I would like to use an allocation tailored to my system's requirements. I am interested in making my system more robust to Doppler effect (and thus to frequency shifting).
Is it right to assume that more null subcarriers or more pilot subcarriers will improve the OFDM performance under Doppler effect?