Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
First Claim
1. An apparatus, comprising:
- a processor configured to generate a data frame including a non-payload region and a payload region; and
a transmitter configured to wirelessly broadcast the data frame,wherein the payload region of the data frame comprises a first set of orthogonal frequency domain multiplexing (OFDM) symbols and a second set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols and the second set of OFDM symbols comprising a useful portion and a cyclic prefix,wherein the processor is further configured to form the first set of OFDM symbols using a first transform size and a first cyclic prefix size, and to form the second set of OFDM symbols using a second transform size and a second cyclic prefix size,wherein the first cyclic prefix size is a sum of a first base cyclic prefix size and an extension size,wherein the second cyclic prefix size is a sum of a second base cyclic prefix size and the extension size, andwherein the first transform size is different than the second transform size.
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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.
133 Citations
11 Claims
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1. An apparatus, comprising:
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a processor configured to generate a data frame including a non-payload region and a payload region; and a transmitter configured to wirelessly broadcast the data frame, wherein the payload region of the data frame comprises a first set of orthogonal frequency domain multiplexing (OFDM) symbols and a second set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols and the second set of OFDM symbols comprising a useful portion and a cyclic prefix, wherein the processor is further configured to form the first set of OFDM symbols using a first transform size and a first cyclic prefix size, and to form the second set of OFDM symbols using a second transform size and a second cyclic prefix size, wherein the first cyclic prefix size is a sum of a first base cyclic prefix size and an extension size, wherein the second cyclic prefix size is a sum of a second base cyclic prefix size and the extension size, and wherein the first transform size is different than the second transform size. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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generating a data frame including a non-payload region and a payload region; and wirelessly broadcasting the data frame, wherein the payload region of the data frame comprises a first set of orthogonal frequency domain multiplexing (OFDM) symbols and a second set of OFDM symbols, each OFDM symbol in the first set of OFDM symbols and the second set of OFDM symbols comprising a useful portion and a cyclic prefix, wherein generating the data frame comprises; forming the first set of OFDM symbols using a first transform size and a first cyclic prefix size, and forming the second set of OFDM symbols using a second transform size and a second cyclic prefix size, wherein the first cyclic prefix size is a sum of a first base cyclic prefix size and an extension size, wherein the second cyclic prefix size is a sum of a second base cyclic prefix size and the extension size, and wherein the first transform size is different than the second transform size. - View Dependent Claims (8, 9, 10, 11)
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Specification