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US 10,568,094 B2Granted
Systems and methods for OFDM channelization
AssigneeApple Inc.
InventorsHang Zhang, Jianglei Ma, Ming Jia, Sophie Vrzic, Mo-Han Fong, Dong-Sheng Yu, Hua Xu
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Abstract
Systems and methods for OFDM channelization are provided that allow for the coexistence of sub-band channels and diversity channels. Methods of defining diversity sub-channels and sub-band sub-channels are provided and systematic channel definition and labeling schemes are provided.
Claims20
An apparatus, comprising:
- a memory;
- and
- a processing element coupled to the memory, wherein the processing element is configured to:
- partition a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) band into a plurality of sub-bands, wherein each sub-band comprises a respective contiguous set of sub-carriers across a plurality of orthogonal frequency division multiplexing (OFDM) symbol durations;
- map first encoded data for a first user equipment device onto a first diversity channel of a plurality of diversity channels, wherein the first diversity channel utilizes a first set of distributed sub-bands of the plurality of sub-bands in a first plurality of OFDM symbols and a second set of distributed sub-bands of the plurality of sub-bands in a second plurality of OFDM symbols, wherein the second set of distributed sub-bands are shifted in frequency from the first set of distributed sub-bands;
- map second encoded data for a second user equipment device onto a first sub-band channel of a plurality of sub-band channels, wherein the sub-band channel utilizes a set of contiguous sub-bands in the first and second plurality of OFDM symbols, wherein the sub-band channel utilizes sub-bands located at the same frequencies for the first and second plurality of OFDM symbols;
- and
- transmit, via a wireless interface, the plurality of diversity and sub-band channels within an OFDM band.
5 more elements
A method of operating a base station, comprising:
- partitioning a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) band into a plurality of sub-bands, wherein each sub-band comprises a respective contiguous set of sub-carriers across a plurality of orthogonal frequency division multiplexing (OFDM) symbol durations;
- mapping first encoded data for a first user equipment device onto a first diversity channel of a plurality of diversity channels, wherein the first diversity channel utilizes a first set of distributed sub-bands of the plurality of sub-bands in a first plurality of OFDM symbols and a second set of distributed sub-bands of the plurality of sub-bands in a second plurality of OFDM symbols, wherein the second set of distributed sub-bands are shifted in frequency from the first set of distributed sub-bands;
- mapping second encoded data for a second user equipment device onto a first sub-band channel of a plurality of sub-band channels, wherein the sub-band channel utilizes a set of contiguous sub-bands in the first and second plurality of OFDM symbols, wherein the sub-band channel utilizes sub-bands located at the same frequencies for the first and second plurality of OFDM symbols;
- and
- transmitting, via a wireless interface of the base station, the plurality of diversity and sub-band channels within an OFDM band.
2 more elements
A base station for communicating with one or more mobile stations, comprising:
- a memory that stores processor executable program instructions;
- and
- a processor coupled to the memory, wherein the program instructions, when executed by the processor, cause the processor to:
- partition a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) band into a plurality of sub-bands, wherein each sub-band comprises a respective contiguous set of sub-carriers across a plurality of orthogonal frequency division multiplexing (OFDM) symbol durations;
- map first encoded data for a first user equipment device onto a first diversity channel of a plurality of diversity channels, wherein the first diversity channel utilizes a first set of distributed sub-bands of the plurality of sub-bands in a first plurality of OFDM symbols and a second set of distributed sub-bands of the plurality of sub-bands in a second plurality of OFDM symbols, wherein the second set of distributed sub-bands are shifted in frequency from the first set of distributed sub-bands;
- map second encoded data for a second user equipment device onto a first sub-band channel of a plurality of sub-band channels, wherein the sub-band channel utilizes a set of contiguous sub-bands in the first and second plurality of OFDM symbols, wherein the sub-band channel utilizes sub-bands located at the same frequencies for the first and second plurality of OFDM symbols;
- and
- transmit, via a wireless interface, the plurality of diversity and sub-band channels within an OFDM band.
5 more elements
Dependencies are inferred from the claim text.