Method for beam steering in multiple-input multiple-output system

Abstract

Embodiments herein provides a method and system for beam steering in a Multiple Input Multiple Output (MIMO) system. The method comprising determining a precoder matrix based on at least one of an inter-antenna element spacing controlled based on a selection of a number of antenna elements at the transmitter and a location of at least one receiver; and steering a transmit beam using the precoder matrix towards the at least one receiver. Yet another embodiments proposes the method and system for steering the at least one optimal receive beam or optimal sub-receive beam towards the at least one transmitter based on at least one of a Channel Quality Indication (CQI), a Channel State Information (CSI), and a location.

What is claimed is: 
     
         1 . A method for beam steering in a Multiple Input Multiple Output (MIMO) system, the method comprising:
 forming, by a receiver, a plurality of receive beams;   detecting, by the receiver, a plurality of transmit beams from at least one transmitter using at least one receive beam from the plurality of receive beams;   measuring, by the receiver, at least one of at least one Channel Quality Indicator (CQI) of the at least one transmit beam from the plurality of transmit beams, and at least one Channel State Information (CSI) of the at least one transmit beam from the plurality of transmit beams;   determining, by the receiver, at least one optimal transmit beam from the plurality of transmit beams and at least one optimal receive beam from the plurality of receive beams based on at least one of the at least one CQI of the at least one transmit beam from the plurality of transmit beams, and the at least one CSI of the at least one transmit beam from the plurality of transmit beams;   reporting, by the receiver, to the at least one transmitter at least one optimal transmit beam determined from the plurality of transmit beams and at least one of the at least one CQI of the at least one transmit beam from the plurality of transmit beams, the at least one CSI of the at least one transmit beam from the plurality of transmit beams, and a location of the receiver; and   steering, by the receiver, the at least one optimal receive beam towards the at least one transmitter.   
     
     
         2 . The method of  claim 1 , further comprising:
 forming, by the receiver, a plurality of sub-receive beams within the at least one optimal receive beam;   detecting, by the receiver, a plurality of sub-transmit beams within the at least one optimal transmit beam from the at least one transmitter using the at least one sub-receive beam from the plurality of sub-receive beams;   measuring, by the receiver, at least one of at least one CQI of the at least one sub-transmit beam from the plurality of sub-transmit beams, and at least one CSI of the at least one sub-transmit beam from the plurality of sub-transmit beams;   determining, by the receiver, at least one optimal sub-transmit beam from the plurality of sub-transmit beams and at least one optimal sub-receive beam from the plurality of sub-receive beams based on at least one of the at least one CQI of the at least one sub-transmit beam from the plurality of sub-transmit beams, and the at least one CSI of the at least one sub-transmit beam from the plurality of sub-transmit beams;   reporting, by the receiver, to the at least one transmitter, the at least one optimal sub-transmit beam determined from the plurality of sub-transmit beams and at least one of the at least one CQI of the at least one sub-transmit beam from the plurality of sub-transmit beams, the at least one CSI of the at least one sub-transmit beam from the plurality of sub-transmit beams, and the location of the receiver; and   steering, by the receiver, the at least one optimal sub-receive beam towards the at least one transmitter.   
     
     
         3 . The method of  claim 1 , wherein the at least one receive beam from the plurality of receive beams is steered by dynamically cycling at least one precoder matrix over an allocated resource, wherein dynamic cycling is performed over at least one of a time resource and a frequency resource. 
     
     
         4 . The method of  claim 2 , wherein the at least one sub-receive beam from the plurality of sub-receive beams is steered by dynamically cycling at least one precoder matrix over an allocated resource, wherein dynamic cycling is performed over at least one of a time resource and a frequency resource. 
     
     
         5 . The method of  claim 1 , wherein the at least one optimal receive beam is a wider receive beam used to receive at least one of broadcast signal and control signal from the at least one transmitter. 
     
     
         6 . The method of  claim 1 , wherein the at least one optimal sub-receive beam is a narrow receive beam used to receive data signals from the at least one transmitter. 
     
     
         7 . The method of  claim 1 , wherein a width of the receive beam, a direction of the receive beam, and a gain of the receive beam are controlled based on at least one of the number of receive antenna elements, the selection of the number of receive antenna elements and the inter-antenna element spacing at the receiver. 
     
     
         8 . A receiver for beam steering in a Multiple Input Multiple Output (MIMO) system, the receiver comprising:
 a memory; and   a processor, coupled to the memory, configured to:
 form a plurality of receive beams, 
 detect a plurality of transmit beams from at least one transmitter using at least one receive beam from the plurality of receive beams, 
 measure at least one of at least one Channel Quality Indicator (CQI) of the at least one transmit beam from the plurality of transmit beams, and at least one Channel State Information (CSI) of the at least one transmit beam from the plurality of transmit beams, 
 determine at least one optimal transmit beam from the plurality of transmit beams and at least one optimal receive beam from the plurality of receive beams based on at least one of the at least one CQI of the at least one transmit beam from the plurality of transmit beams, and the at least one CSI of the at least one transmit beam from the plurality of transmit beams, 
 report to the at least one transmitter at least one optimal transmit beam determined from the plurality of transmit beams and at least one of the at least one CQI of the at least one transmit beam from the plurality of transmit beams, at least one CSI of the at least one transmit beam from the plurality of transmit beams, and a location of the receiver, and 
 steer the at least one optimal receive beam towards the at least one transmitter. 
   
     
     
         9 . The receiver of  claim 8 , wherein the processor is further configured to:
 form a plurality of sub-receive beams within the at least one optimal receive beam,   detect a plurality of sub-transmit beams within the at least one optimal transmit beam from the at least one transmitter using the at least one sub-receive beam from the plurality of sub-receive beams,   measure at least one of at least one CQI of the at least one sub-transmit beam from the plurality of sub-transmit beams, and at least one CSI of the at least one sub-transmit beam from the plurality of sub-transmit beams,   determine at least one optimal sub-transmit beam from the plurality of sub-transmit beams and at least one optimal sub-receive beam from the plurality of sub-receive beams based on at least one of the at least one CQI of the at least one sub-transmit beam from the plurality of sub-transmit beams, and the at least one CSI of the at least one sub-transmit beam from the plurality of sub-transmit beams,   report to the at least one transmitter the at least one optimal sub-transmit beam determined from the plurality of sub-transmit beams and at least one of the at least one CQI of the at least one sub-transmit beam from the plurality of sub-transmit beams, the at least one CSI of the at least one sub-transmit beam from the plurality of sub-transmit beams, and the location of the receiver, and   steer the at least one optimal sub-receive beam towards the at least one transmitter.   
     
     
         10 . The receiver of  claim 8 , wherein the at least one receive beam from the plurality of receive beams is steered by dynamically cycling at least one precoder matrix over an allocated resource, wherein dynamic cycling is performed over at least one of a time resource and a frequency resource. 
     
     
         11 . The receiver of  claim 9 , wherein the at least one sub-receive beam from the plurality of sub-receive beams is steered by dynamically cycling at least one precoder matrix over an allocated resource, wherein dynamic cycling is performed over at least one of a time resource and a frequency resource. 
     
     
         12 . The receiver of  claim 8 , wherein the at least one optimal receive beam is a wider receive beam used to receive at least one of broadcast signal and control signal from the at least one transmitter. 
     
     
         13 . The receiver of  claim 8 , wherein the at least one optimal sub-receive beam is a narrow receive beam used to receive data signals from the at least one transmitter. 
     
     
         14 . The receiver of  claim 8 , wherein a width of the receive beam, a direction of the receive beam, and a gain of the receive beam are controlled based on at least one of the number of receive antenna elements, the selection of the number of receive antenna elements and the inter-antenna element spacing at the receiver.