Communication Device and Method for Reducing Interference

Abstract

A communication device and a method for Orthogonal Frequency Division Multiplexing (OFDM) configured to receive a signal from a second device; perform a channel estimation on the signal, wherein the channel estimation comprises determining a channel path gain, a channel path delay, and at least one of a channel path angle of arrival (AoA) or a channel path angle of departure (AoD); determine an optimal analog beamforming direction based on the channel estimation; and communicating the data using the analog beamforming.

1 .- 25 . (canceled) 
     
     
         26 . A device configured to communicate data in an orthogonal frequency division multiplexing (OFDM) system, comprising:
 at least one antenna configured to receive at least one reference signal from a second device via a plurality of channel paths; and   a baseband modem configured to:
 perform a channel estimation on the plurality of channel paths; and 
 determine an analog beamforming to be produced by the device according to the channel estimation, wherein the analog beamforming is based on at least one of an inter-symbol interference caused by channel delays or signal-to-interference-plus-noise ratio (SINK) per subcarrier; and 
   wherein the device is further configured to communicate the data with the second device using the analog beamforming.   
     
     
         27 . The device of  claim 26 ,
 wherein the at least one antenna and the baseband modem are integrated into a single unit.   
     
     
         28 . The device of  claim 26 ,
 wherein the channel estimation includes determining a channel path gain, a channel path delay, and at least one of a channel path angle of arrival or a channel path angle of departure.   
     
     
         29 . The device of  claim 28 ,
 wherein the baseband modem is further configured to use a least square algorithm to determine the channel path gain.   
     
     
         30 . The device of  claim 28 ,
 wherein the baseband modem is further configured to use multiple signal classification to determine the channel path angle of arrival or the channel path angle of departure.   
     
     
         31 . The device of  claim 26 ,
 wherein the baseband modem is further configured to use estimation of signal parameters via rotation invariance techniques to determine a channel path angle of arrival or a channel path angle of departure.   
     
     
         32 . The device of  claim 26 ,
 wherein the baseband modem is further configured to implement the channel estimation by using an uplink channel estimation to acquire a downlink channel information.   
     
     
         33 . A base station comprising:
 one or more antennas; and   at least one processor in communication with the one or more antennas, wherein the at least one processor is configured to:
 perform, based on at least one reference signal received via a plurality of channel paths, a channel estimation on the plurality of channel paths; 
 determine an analog beamforming to be produced based on at least a signal-to-interference-plus-noise ratio per sub-carrier in an orthogonal frequency division multiplexing (OFDM) system; and 
 communicate data with a wireless device using the analog beamforming. 
   
     
     
         34 . The base station of  claim 33 ,
 wherein the channel estimation includes determining a channel path gain, a channel path delay, and at least one of a channel path angle of arrival or a channel path angle of departure.   
     
     
         35 . The base station of  claim 34 ,
 wherein the at least one processor is further configured to use a least square algorithm to determine the channel path gain.   
     
     
         36 . The base station of  claim 34 ,
 wherein the at least one processor is further configured to use multiple signal classification to determine the channel path angle of arrival or the channel path angle of departure.   
     
     
         37 . The base station of  claim 33 ,
 wherein the at least one processor is further configured to use estimation of signal parameters via rotation invariance techniques to determine a channel path angle of arrival or a channel path angle of departure.   
     
     
         38 . The base station of  claim 33 ,
 wherein the at least one processor is further configured to implement the channel estimation by using an uplink channel estimation to acquire a downlink channel information.   
     
     
         39 . A non-transitory computer readable memory medium storing program instructions executable by processing circuitry to cause a baseband processor of a wireless device to:
 perform, based on at least one reference signal received via a plurality of channel paths, a channel estimation on the plurality of channel paths;   determine an analog beamforming to be produced based on at least an inter-symbol interference caused by channel delays; and   communicate data with another wireless device using the analog beamforming.   
     
     
         40 . The non-transitory computer readable memory medium of  claim 39 ,
 wherein the channel estimation includes determining a channel path gain, a channel path delay, and at least one of a channel path angle of arrival or a channel path angle of departure.   
     
     
         41 . The non-transitory computer readable memory medium of  claim 40 ,
 wherein the program instructions are further executable by processing circuitry to cause the baseband processor of the wireless device to use a least square algorithm to determine the channel path gain.   
     
     
         42 . The non-transitory computer readable memory medium of  claim 40 ,
 wherein the program instructions are further executable by processing circuitry to cause the baseband processor of the wireless device to use multiple signal classification to determine the channel path angle of arrival or the channel path angle of departure.   
     
     
         43 . The non-transitory computer readable memory medium of  claim 39 ,
 wherein the program instructions are further executable by processing circuitry to cause the baseband processor of the wireless device to use estimation of signal parameters via rotation invariance techniques to determine a channel path angle of arrival or a channel path angle of departure.   
     
     
         44 . The non-transitory computer readable memory medium of  claim 39 ,
 wherein the program instructions are further executable by processing circuitry to cause the baseband processor of the wireless device to implement the channel estimation by using an uplink channel estimation to acquire a downlink channel information.   
     
     
         45 . The non-transitory computer readable memory medium of  claim 39 ,
 wherein the analog beamforming is directed towards channel paths with a channel path delay with a duration equal to or less than a cyclic prefix duration of an orthogonal frequency division multiplexing (OFDM) system.