Configurable constellation mapping to control spectral efficiency versus signal-to-noise ratio
First Claim
1. An apparatus, comprising a transmitter that includes:
- a constellation mapper to map a data block to a block of subcarriers;
a modulator to modulate a baseband carrier with the block of subcarriers;
a frequency converter to convert the baseband carrier to a passband carrier; and
a controller to configure the constellation mapper to map the data block to the block of subcarriers based on one or more of multiple selectable modulation schemes, including to configure the constellation mapper in a first configuration to map each of multiple segments of the data block to a respective subset of the sub-carriers based on a respective selected one of the modulation schemes, to control spectral efficiency versus signal-to-noise ratio (SEvSNR) of the passband carrier over a range of SNR based on SEvSNRs of the respective modulation schemes;
where the controller is further configured to configure the constellation mapper in the first configuration to control the SEvSNR of the passband carrier as an average of the SEvSNRs of the respective selected modulation schemes.
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Abstract
Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.
18 Citations
18 Claims
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1. An apparatus, comprising a transmitter that includes:
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a constellation mapper to map a data block to a block of subcarriers; a modulator to modulate a baseband carrier with the block of subcarriers; a frequency converter to convert the baseband carrier to a passband carrier; and a controller to configure the constellation mapper to map the data block to the block of subcarriers based on one or more of multiple selectable modulation schemes, including to configure the constellation mapper in a first configuration to map each of multiple segments of the data block to a respective subset of the sub-carriers based on a respective selected one of the modulation schemes, to control spectral efficiency versus signal-to-noise ratio (SEvSNR) of the passband carrier over a range of SNR based on SEvSNRs of the respective modulation schemes; where the controller is further configured to configure the constellation mapper in the first configuration to control the SEvSNR of the passband carrier as an average of the SEvSNRs of the respective selected modulation schemes. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus, comprising a transmitter that includes:
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a constellation mapper to map a data block to a block of subcarriers; a modulator to modulate a baseband carrier with the block of subcarriers; a frequency converter to convert the baseband carrier to a passband carrier; and a controller to configure the constellation mapper to map the data block to the block of subcarriers based on one or more of multiple selectable modulation schemes, including to configure the constellation mapper in a first configuration to map each of multiple segments of the data block to a respective subset of the sub-carriers based on a respective selected one of the modulation schemes, to control spectral efficiency versus signal-to-noise ratio (SEvSNR) of the passband carrier over a range of SNR based on SEvSNRs of the respective modulation schemes; wherein the constellation mapper includes multiple types of constellation mappers, each type to map bits based on a respective one of the multiple selectable modulation schemes; and an inverse multiplexer to distribute segments of the data block amongst selected types of the constellation mappers, including to segment the data block into bit-lengths based on the respective selected modulation scheme. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A non-transitory computer-readable medium encoded with a computer program that includes:
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constellation mapping instructions to cause a processor to map a data block to a block of subcarriers; modulation instructions to cause the processor to modulate a baseband carrier with the block of subcarriers; frequency conversion instructions to cause the processor to convert the baseband carrier to a passband carrier; and controller instructions to cause the processor to configure the constellation mapping instructions to map the data block to the block of subcarriers based on one or more of multiple selectable modulation schemes, including to configure the constellation mapping instructions in a first configuration to map each of multiple segments of the data block to a respective subset of the sub-carriers based on a respective selected one of the modulation schemes, to control spectral efficiency versus signal-to-noise ratio (SEvSNR) of the passband carrier over a range of SNR based on SEvSNRs of the respective modulation schemes; wherein the controller instructions include instructions to cause the processor to configure the constellation mapping instructions in the first configuration to control the SEvSNR of the passband carrier as an average of the SEvSNRs of the respective selected modulation schemes. - View Dependent Claims (13, 14, 15, 16)
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17. A non-transitory computer-readable medium encoded with a computer program that include:
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constellation mapping instructions to cause a processor to map a data block to a block of subcarriers; modulation instructions to cause the processor to modulate a baseband carrier with the block of subcarriers; frequency conversion instructions to cause the processor to convert the baseband carrier to a passband carrier; and controller instructions to cause the processor to configure the constellation mapping instructions to map the data block to the block of subcarriers based on one or more of multiple selectable modulation schemes, including to configure the constellation mapping instructions in a first configuration to map each of multiple segments of the data block to a respective subset of the sub-carriers based on a respective selected one of the modulation schemes, to control spectral efficiency versus signal-to-noise ratio (SEvSNR) of the passband carrier over a range of SNR based on SEvSNRs of the respective modulation schemes; wherein the constellation mapping instructions include inverse multiplexing instructions to cause the processor to segment the data block into bit-lengths based on respective selected modulation schemes. - View Dependent Claims (18)
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Specification