| 摘要 |
A base station may generate and transmit a transport stream including a sequence of frames. A frame may include a plurality of partitions, where each partition includes a corresponding set of OFDM symbols. For each partition, the OFDM symbols in that partition may have a corresponding cyclic prefix size and a corresponding FFT size, allowing different partitions to be targeted for different collections of user devices, e.g., user devices having different expected values of maximum delay spread and/or different ranges of mobility. The base station may also dynamically re-configure the sample rate of each frame, allowing further resolution in control of subcarrier spacing. By allowing the cyclic prefixes of different OFDM symbols to have different lengths, it is feasible to construct a frame that conforms to a set payload duration and has arbitrary values of cyclic prefix size per partition and FFT size per partition. The partitions may be multiplexed in time and/or frequency. |
| 主权项 |
1. A method for constructing a data frame, the method comprising the steps of:
dividing, by a processor, a frame into a plurality of partitions; for each of the plurality of partitions, determining, by a processor, a length of an associated OFDM symbol; calculating, by a processor, a sum of OFDM symbol lengths in a union of the OFDM symbols over the plurality of partitions; computing, by a processor, a number of excess samples based on the calculated sum and based on a length of a payload region of the frame; and for each OFDM symbol in the union, assigning, by a processor, the OFDM symbol to one of at least one subset of the union using at least one of the number of excess samples and an index of the OFDM symbol, and adding a number to a cyclic prefix size of each OFDM symbol in each of the at least one subset of the union, prior to embedding the OFDM symbols in the frame. |
