The length of slot is 0.5 us (for sampling 30.72MHz it is 15360 samples). However, each symbol has FFT_size = 2048 samples (for 30.72MHz). A slot equals 7 symbols, so 7*2048 = 14336 samples < 15360 samples in the slot. Guardian interval (cyclic prefix) between symbols is equal 144 samples according standard.
The extra length is due to the fact that 7 symbols (plus the CP) don't fit exactly into the slot. Here's the math:
7 symbols with the CP are 7 * (2048 + 144) = 15344 time units There are 15360 - 15344 = 16 samples left over, so they is simply added to the first CP in the slot (144 + 16 = 160) in order to completely fill the slot.
The extra length is due to the fact that 7 symbols (plus the CP) don't fit exactly into the slot. Here's the math:
7 symbols with the CP are 7 * (2048 + 144) = 15344 time units There are 15360 - 15344 = 16 samples left over, so they is simply added to the first CP in the slot (144 + 16 = 160) in order to completely fill the slot.
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