Rank step-down for MIMO SCW design employing HARQ
First Claim
1. A method of performing rank step-down to preserve code rate across multiple transmissions in a transmission frame, comprising:
- generating a plurality of coded symbols at an access point;
updating a MIMO transmission rank in a deterministic manner to reflect a rank step down sequence such that the MIMO transmission rank is reduced with successive transmissions,wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number;
demultiplexing the coded symbols to determine a value, M, of MIMO layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1≦
M≦
MT; and
spatially mapping M layers using a spatial mapping matrix.
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Accused Products
Abstract
Systems and methodologies are described that facilitate reducing rank (e.g., of a user device) as a number of transmissions there from increases. Such rank step-down can improve interference resistance and facilitate maintaining code rate despite transmission propagation. Additionally, rank step-down information can be encoded along with CQI information to generate a 5-bit CQI signal that can facilitate updating a user'"'"'s rank upon each CQI transmission (e.g., approximately every 5 ms). The described systems and/or methods can be employed in a single code word (SCW) wireless communication environment with a hybrid automatic request (HARQ) protocol.
44 Citations
42 Claims
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1. A method of performing rank step-down to preserve code rate across multiple transmissions in a transmission frame, comprising:
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generating a plurality of coded symbols at an access point; updating a MIMO transmission rank in a deterministic manner to reflect a rank step down sequence such that the MIMO transmission rank is reduced with successive transmissions, wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; demultiplexing the coded symbols to determine a value, M, of MIMO layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1≦
M≦
MT; andspatially mapping M layers using a spatial mapping matrix. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of performing rank step down in a transmission frame at an access point in a wireless communication environment, comprising:
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generating a plurality of coded symbols at an access point; updating a rank for a MIMO transmission to a user device in a deterministic manner to reflect a rank step-down sequence such that the MIMO transmission rank is reduced with successive transmissions according to the rank step-down sequence; wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; demultiplexing the coded symbols to generate M MIMO transmission layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1≦
M≦
MT; andspatially mapping the MT MIMO transmission layers using a spatial mapping matrix. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory computer readable medium having stored thereon computer executable instructions for:
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generating a plurality of coded symbols at an access point; updating a MIMO transmission rank in a deterministic manner to reflect rank step-down sequence such that the MIMO transmission rank is reduced with successive transmissions, wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; demultiplexing the coded symbols to determine a value, M, of MIMO layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1≦
M≦
MT; andspatially mapping M layers using a spatial mapping matrix. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A processor executing from a non-transitory computer readable medium comprising computer-executable instructions for:
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generating a plurality of coded symbols at an access point; updating a MIMO transmission rank in a deterministic manner to reflect a rank step-down sequence such that the MIMO transmission rank is reduced with successive transmissions according to the rank step-down sequence, wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; demultiplexing the coded symbols to determine a, value, M, of MIMO layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1≦
M≦
MT; andspatially mapping M layers using a spatial mapping matrix. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus that facilitates performing rank step-down to preserve code rate across multiple transmissions in a transmission frame, comprising:
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a processor configured to; generate a plurality of coded symbols at an access point; update a MIMO transmission rank in a deterministic manner to reflect a rank step-down sequence such that the MIMO transmission rank is reduced with successive transmissions, wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; demultiplex the coded symbols to determine a value, M, of MIMO layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1≦
M≦
MT; andspatially map M layers using a spatial mapping matrix. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A wireless communication apparatus, comprising:
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means for generating a plurality of coded symbols at an access point; means for updating a MIMO transmission rank in a deterministic manner to reflect a rank step-down sequence such that the MIMO transmission rank is reduced with successive transmissions, wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; means for demultiplexing the coded symbols to determine a value, M, of MIMO layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1<
M<
MT; andmeans for spatially mapping M layers using a spatial mapping matrix. - View Dependent Claims (32, 33, 34, 35, 36, 41, 42)
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37. A wireless communication apparatus, comprising:
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means for generating a plurality of coded symbols at an access point; means for updating a rank for a MIMO transmission to a user device in a deterministic manner to reflect a rank step-down sequence such that the MIMO transmission rank is reduced with successive transmissions according to the rank step-down sequence, wherein the MIMO transmission rank is determined based on spectral efficiency, modulation, code rate, and transmission number; means for demultiplexing the coded symbols to generate M MIMO transmission layers with information symbols and (MT−
M) MIMO layers with erasure symbols, where M and MT are integers and 1<
M<
MT; andmeans for spatially mapping the MT MIMO transmission layers using a spatial mapping matrix. - View Dependent Claims (38, 39, 40)
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Specification