| 摘要 |
The invention provides a transmitter adapted to transmit using: a first mode of operation in which OFDM symbols are constructed from N time domain samples; a second mode of operation in which OFDM symbols are constructed from N/2 time domain samples. Alternatively, the transmitter may comprise a first FFT element that has a first FFT size and generates first OFDM symbols with a first duration, each first OFDM symbol having a respective first cyclic prefix, a second FFT element that has a second FFT size that is smaller than the first FFT size that generates second OFDM symbols with a second duration that is shorter than the first duration, each second OFDM symbol having a respective second cyclic prefix, a duration of each second cyclic prefix being shorter than a duration of each first cycle prefix, the transmitter being adapted to transmit a series of slots with fixed duration, the slots containing first OFDM symbols and second OFDM symbols. |
