Increasing the range of access point cells for a given throughput in a downlink of a wireless local area network
First Claim
1. A method of transmitting data in a downlink of a plurality of access point cells, the method comprising:
- providing a plurality of antennas at an access point to transmit said data to a wireless unit under at least one of a first and a second radiated power constraints;
selecting a group of sub-carriers including a plurality of non-adjacent sub-carriers with a low channel correlation; and
performing joint beamforming over the group of sub-carriers to determine a plurality of weights to be applied to each sub-carrier for transmission using said plurality of antennas, said joint beamforming being performed subject to said at least one of said first and second radiated power constraints.
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Abstract
The present invention provides a method and an apparatus may increase or extend the range of wireless communication cells for a given throughput in a downlink of a wireless communication system. When transmitting data in a downlink of a plurality of access point cells in a wireless local area network (WLAN), the range of the downlink may be increased for a given throughput under one or more radiated power constraints. The method includes providing a plurality of antennas at an access point to transmit the data to a wireless unit under at least one of a first and a second radiated power constraints. The method further includes using the plurality of antennas for beamforming over a group of sub-carriers subject to the first and/or second radiated power constraints. Under one or more radiated power constraints, a multiple antenna based beamforming may extend the range of a wireless communication for a user of a wireless unit that may be located within a coverage area across the plurality of access point cells of a Wi-Fi network associated with the WLAN. A joint beamforming optimized over all of sub-carriers may account for a European regulation restriction into at least one of an averaged and a spectral density Equivalent Isotropic Radiated Power (EIRP) constraint. In this way, an Orthogonal Frequency-Division Multiplexing (OFDM) based joint beamformer may provide a significant performance improvement and range extension.
171 Citations
20 Claims
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1. A method of transmitting data in a downlink of a plurality of access point cells, the method comprising:
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providing a plurality of antennas at an access point to transmit said data to a wireless unit under at least one of a first and a second radiated power constraints; selecting a group of sub-carriers including a plurality of non-adjacent sub-carriers with a low channel correlation; and performing joint beamforming over the group of sub-carriers to determine a plurality of weights to be applied to each sub-carrier for transmission using said plurality of antennas, said joint beamforming being performed subject to said at least one of said first and second radiated power constraints. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification