Adaptive signaling in multiple antenna systems
First Claim
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1. A method, comprising:
- if channels in a communication system are well-conditioned, then operating in a multiple input, multiple output (MIMO) mode; and
in the event of a predetermined condition, operating in a spatial division, multiple access (SDMA) mode;
wherein the predetermined condition is a function of at least one of media access control layer performance and physical layer performance and wherein in the SDMA mode the predetermined conditioned is indicative of poor media access control (MAC) layer performance.
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Abstract
Briefly, in accordance with one embodiment of the invention, a wireless communication system may adaptively switch between a multiple input, multiple output mode and a spatial division, multiple access mode based at least in part on channel conditions and traffic conditions.
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Citations
31 Claims
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1. A method, comprising:
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if channels in a communication system are well-conditioned, then operating in a multiple input, multiple output (MIMO) mode; and in the event of a predetermined condition, operating in a spatial division, multiple access (SDMA) mode; wherein the predetermined condition is a function of at least one of media access control layer performance and physical layer performance and wherein in the SDMA mode the predetermined conditioned is indicative of poor media access control (MAC) layer performance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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if channels in a communication system are ill-conditioned, then operating in a spatial division, multiple access mode; and in the event of a predetermined condition, operating in a multiple input, multiple output mode; wherein the predetermined condition is a function of at least one of media access control layer performance and physical layer performance. - View Dependent Claims (8, 9, 10, 11)
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12. A method, comprising:
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estimating a channel matrix for at least one or more receivers; if from the channel matrix it is determined that channels are well-conditioned then operating in a multiple input, multiple output mode; and otherwise operating in a spatial division, multiple access mode until an occurrence of a predetermined condition which is a function of at least one of media access layer performance and physical layer performance. - View Dependent Claims (13, 14)
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15. A non-transitory machine-accessible medium that provides instructions, which when accessed, cause a machine to perform operations comprising:
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adaptively switching between a multiple input, multiple output mode and a spatial division, multiple access mode by; estimating a channel matrix for at least one or more receivers; if from the channel matrix it is determined that channels are well-conditioned, then operating in a multiple input, multiple output mode; and otherwise operating in a spatial division, multiple access mode until an occurrence of a predetermined condition which is a function of at least one of media access layer performance and physical layer performance. - View Dependent Claims (16, 17)
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18. An apparatus, comprising:
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a transceiver; at least two or more omnidirectional antennas to couple to said transceiver; and a baseband processor to couple to said transceiver, wherein said baseband processor and said transceiver switch from a multiple input, multiple output mode to a spatial division, multiple access (MIMO) mode under a first condition indicative of poor physical (PHY) layer performance in the MIMO mode, and switch from a spatial division, multiple access mode to a multiple input, multiple output mode under a second condition, wherein the second condition is a function of at least one of media access control (MAC) layer performance and physical (PHY) layer performance. - View Dependent Claims (19, 20)
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21. An apparatus, comprising:
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a transceiver adapted for communication in a wireless network, wherein said transceiver includes a plurality of antennas and is configured to modify the number of transmit antennas based on channel characteristics of said wireless network by adaptively switching between a multiple input, multiple output (MIMO) mode and a spatial division, multiple access (SDMA) mode upon an occurrence of a predetermined condition which is a function of at least one of media access layer performance and physical layer performance; wherein the predetermined conditioned is indicative of poor physical (PHY) layer performance in the MIMO mode; wherein the predetermined conditioned is indicative of poor media access control (MAC) layer performance in the SDMA mode. - View Dependent Claims (22, 23, 24, 25)
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26. An antenna selection method, comprising:
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operating a transceiver that includes a plurality of antennas in a wireless network and modifying the number of transmit antennas based on channel characteristics of said wireless network by adaptively switching between a multiple input, multiple output (MIMO) mode and a spatial division, multiple access (SDMA) mode upon an occurrence of a predetermined condition which is a function of at least one of media access layer performance and physical layer performance; wherein the predetermined conditioned is indicative of poor physical (PHY) layer performance in the MIMO mode; wherein the predetermined conditioned is indicative of poor media access control (MAC) layer performance in the SDMA mode. - View Dependent Claims (27, 28)
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29. A method, comprising:
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operating in a first mode; and in the event of a predetermined condition, operating in a second mode; wherein the first mode and the second mode are one of a multiple input, multiple output (MIMO) mode and a spatial multiplexing (SDMA) mode; wherein the predetermined condition is a function of at least one of media access control (MAC) layer performance and physical (PHY) layer performance; wherein the predetermined conditioned is indicative of poor physical (PHY) layer performance in the MIMO mode; wherein the predetermined conditioned is indicative of poor media access control (MAC) layer performance in the SDMA mode. - View Dependent Claims (30, 31)
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Specification