Section: 6.12 OFDM baseband signal generation
Content: The time-continuous signal on antenna port in OFDM symbol in a downlink slot is defined by for where and. The variable equals 2048 for subcarrier spacing, 4096 for subcarrier spacing, 12288 for , 24576 for subcarrier spacing , and 82944 for . For frame structure type 3, if PDCCH is to be transmitted in a subframe starting with OFDM symbol based on the received uplink control information that indicates channel occupancy time sharing '1' as specified in [11], OFDM symbol in the previous subframe may be transmitted, given by The OFDM symbols in a slot shall be transmitted in increasing order of , starting with , where OFDM symbol starts at time within the slot. In case the first OFDM symbol(s) in a slot use normal cyclic prefix and the remaining OFDM symbols use extended cyclic prefix, the starting position the OFDM symbols with extended cyclic prefix shall be identical to those in a slot where all OFDM symbols use extended cyclic prefix. Thus there will be a part of the time slot between the two cyclic prefix regions where the transmitted signal is not specified. For , there is one OFDM symbol per slot and one slot per subframe. For , there is one OFDM symbol per slot and one slot per 3ms. Table 6.12-1 lists the value of that shall be used. Note that different OFDM symbols within a slot in some cases have different cyclic prefix lengths. In case NB-IoT is supported, the OFDM baseband signal generation is defined in clause 10.2.8. Table 6.12-1: OFDM parameters