Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
First Claim
1. A method comprising:
- generating, by a processor, a frame comprising a payload portion and a non-payload portion, the payload portion of the frame including a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, each OFDM symbol having a useful portion and a cyclic prefix;
dividing, by the processor, the payload portion of the frame into at least one partition;
calculating, by the processor, a sum of a number of samples in the payload portion of the frame and a number of samples in the non-payload portion of the frame;
computing, by the processor, a number of excess samples based at least in part on a difference between a total number of samples assigned to the frame and the calculated sum;
increasing a cyclic prefix size of each OFDM symbol in the payload portion of the frame based at least in part on the computed number of excess samples; and
transmitting the frame.
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Accused Products
Abstract
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.
127 Citations
8 Claims
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1. A method comprising:
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generating, by a processor, a frame comprising a payload portion and a non-payload portion, the payload portion of the frame including a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, each OFDM symbol having a useful portion and a cyclic prefix; dividing, by the processor, the payload portion of the frame into at least one partition; calculating, by the processor, a sum of a number of samples in the payload portion of the frame and a number of samples in the non-payload portion of the frame; computing, by the processor, a number of excess samples based at least in part on a difference between a total number of samples assigned to the frame and the calculated sum; increasing a cyclic prefix size of each OFDM symbol in the payload portion of the frame based at least in part on the computed number of excess samples; and transmitting the frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification