Implementing transmit RDN architectures in uplink MIMO systems
First Claim
1. A system comprising:
- a multiple-input-multiple-output (MIMO) transmitting system comprising a MIMO baseband module having N branches, where N>
1; and
a radio distribution network (RDN) connected to the MIMO transmitting system,wherein the RDN comprises a plurality of beamformers, wherein each beamformer receives an input signal from a transmitting system and feeds K transmit antennas, where K>
1, so that a total number of transmit antennas in the system is M=N*K, wherein each beamformer includes a passive splitter/combiner configured to split the received input signal into multiple transmit signals, said transmit signals being weighted individually for each transmit antenna,wherein the MIMO baseband module is configured to determine the weights of the transmitting antennas for each beamformer based on quality indicators measured at a receiving side associated with the transmit signals, wherein the quality indicators comprise at least a Modulation Coding Scheme (MCS) determined by the receiving side; and
wherein the MIMO baseband module is configured to use Mobility Monitoring Indicators (MMI) to determine a subset L of the K transmit antennas in at least one of the beamformers, for participating in beamforming, wherein the subset L of the K transmit antennas is selected using a grading mechanism.
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Accused Products
Abstract
A system for implementing a transmit uplink channel in MIMO RDN architecture is provided herein. The system includes a multiple-input-multiple-output (MIMO) transmitting system that includes a MIMO baseband module having N branches; and a radio distribution network (RDN) connected to the MIMO receiving system. The RDN includes at least one beamformer, wherein each of the beamformers feeds K transmit antennas, so that a total number of transmit antennas in the system is M=N*K. At least some of the beamformers include passive splitters/combiners configured to split the signal coming from the transmitter into multiple signals which are weighted individually going to each transmit antenna. The baseband module is configured to repeatedly apply a “blind scanning” process to at least some of the transmit antennas, one at a time, so that performance of the tested transmit beam can be graded.
327 Citations
8 Claims
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1. A system comprising:
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a multiple-input-multiple-output (MIMO) transmitting system comprising a MIMO baseband module having N branches, where N>
1; anda radio distribution network (RDN) connected to the MIMO transmitting system, wherein the RDN comprises a plurality of beamformers, wherein each beamformer receives an input signal from a transmitting system and feeds K transmit antennas, where K>
1, so that a total number of transmit antennas in the system is M=N*K, wherein each beamformer includes a passive splitter/combiner configured to split the received input signal into multiple transmit signals, said transmit signals being weighted individually for each transmit antenna,wherein the MIMO baseband module is configured to determine the weights of the transmitting antennas for each beamformer based on quality indicators measured at a receiving side associated with the transmit signals, wherein the quality indicators comprise at least a Modulation Coding Scheme (MCS) determined by the receiving side; and wherein the MIMO baseband module is configured to use Mobility Monitoring Indicators (MMI) to determine a subset L of the K transmit antennas in at least one of the beamformers, for participating in beamforming, wherein the subset L of the K transmit antennas is selected using a grading mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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a multiple-input-multiple-output (MIMO) transmitting system comprising a MIMO baseband module having N branches, where N>
1; anda radio distribution network (RDN) connected to the MIMO transmitting system, wherein the RDN comprises a plurality of beamformers, wherein each beamformer receives an input signal from a transmitting system and feeds K transmit antennas, where K>
1, so that a total number of transmit antennas in the system is M=N*K, wherein each beamformer includes a passive splitter/combiner configured to split the received input signal into multiple transmit signals, said transmit signals being weighted individually for each transmit antenna,wherein the MIMO baseband module is configured to determine the weights of the transmitting antennas for each beamformer based on quality indicators derived from error rate measured at a receiving side associated with the transmit signals, and wherein the MIMO baseband module is configured to use Mobility Monitoring Indicators (MMI) to determine a subset L of the K transmit antennas in at least one of the beamformers, for participating in beamforming, wherein the subset L of the K transmit antennas is selected using a grading mechanism.
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Specification