Doc.: IEEE 802.11-13/0364r1 SubmissionEldad Perahia, Intel CorporationSlide 1 Date: 2013-03-20 Authors: Antenna Array Gain from Measured Data for 802.11n/ac.

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doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 1 Date: Authors: Antenna Array Gain from Measured Data for n/ac TxBF March 2013

doc.: IEEE /0364r1 Submission Abstract Theoretical calculation of antenna array gain is 10*log10(# of antenna elements) With n/ac MIMO/OFDM transmit beamforming (TxBF), antenna weights matrices are computed on a subcarrier basis In a multipath environment, while the TxBF PER performance gain will be substantial, the composite effective array gain will be much less than 10log10(N) Eldad Perahia, Intel CorporationSlide 2 March 2013

doc.: IEEE /0364r1 Submission Measurements in an Office Environment Measurements captured in n test bed deployed on one floor of an occupied indoor office environment – Dimensions of the floor of the building are 90 ft X 90 ft (~27.4 m X 27.4 m) – In center of floor are labs, elevators, and a kitchen area – Along the walls are workspaces with groups of cubicles and conference rooms – Numbered circles indicate device locations Eldad Perahia, Intel CorporationSlide 3

doc.: IEEE /0364r1 Submission Measurement Device Description Devices are actual n stations consisting of a desktop PC with an Intel Wi-Fi Wireless Link 5300 radio card and external antennas – 3 Tx antennas, 3 Rx antennas, 3 stream packet format – 5 GHz transmission on an empty channel Eldad Perahia, Intel CorporationSlide 4

doc.: IEEE /0364r1 Submission Captured Measurements CSI is measured by having each device in turn transmit a stream of n packets, while all the other devices on the floor receive the packets – Packets are transmitted every 0.8 ms – 3000 packets – measured from the long training field of each packet – 3x3 CSI matrix Received signal level data and noise level data also captured – Used to compute received SNR Eldad Perahia, Intel CorporationSlide 5

doc.: IEEE /0364r1 Submission Antenna Gain Calculation 3x1 TxBF weights computed from CSI for each of the receive antennas Computation performed on each packet Antenna gain computed from weights as shown on next slide Computing statistics: –antenna gain computed over 360 deg azimuth and 90 deg elevation for each subcarrier –Average antenna gain (linear) computed over all subcarriers for each angle –Maximum antenna gain found over all angles –Repeat for each time instance and CDF formed –Antenna gain reported at 50% and 90% probability point of CDF Eldad Perahia, Intel CorporationSlide 6

doc.: IEEE /0364r1 Submission Transmission at angle φ, θ Eldad Perahia, Intel CorporationSlide 7

doc.: IEEE /0364r1 Submission Summary of Array Gain Results (90% Prob) Morning measurementAfternoon measurement SRCDestRx ant 1Rx ant 2Rx ant 3Rx ant 1Rx ant 2Rx ant dB2.3 dB1.7 dB2.5 dB2.6 dB2.0 dB dB3.2 dB3.0 dB2.0 dB3.0 dB1.0 dB dB2.1 dB2.3 dB1.5 dB2.2 dB2.5 dB dB2.9 dB2.7 dB1.6 dB2.4 dB2.0 dB dB3.3 dB2.1 dB2.7 dB3.5 dB2.0 dB dB2.3 dB 1.9 dB1.6 dB2.3 dB dB1.9 dB3.4 dB2.3 dB2.1 dB1.6 dB dB2.3 dB2.0 dB3.4 dB2.1 dB dB2.5 dB1.9 dB2.6 dB2.5 dB2.7 dB dB2.5 dB1.5 dB 2.9 dB2.3 dB dB1.9 dB0.9 dB1.1 dB1.8 dB2.1 dB dB3.1 dB2.3 dB1.9 dB1.2 dB2.4 dB dB2.0 dB2.8 dB1.5 dB2.1 dB2.7 dB Eldad Perahia, Intel CorporationSlide 8

doc.: IEEE /0364r1 Submission Summary of Array Gain Results (50% Prob) Morning measurementAfternoon measurement SRCDestRx ant 1Rx ant 2Rx ant 3Rx ant 1Rx ant 2Rx ant dB1.6 dB1.1 dB2.2 dB2.3 dB1.6 dB dB2.6 dB1.2 dB1.8 dB2.9 dB0.8 dB dB1.4 dB1.8 dB1.0 dB1.5 dB1.8 dB dB2.3 dB2.2 dB1.6 dB2.2 dB1.7 dB dB3.1 dB1.9 dB2.5 dB3.0 dB1.1 dB dB1.8 dB2.2 dB1.7 dB1.3 dB2.2 dB dB1.9 dB3.4 dB1.7 dB1.3 dB1.1 dB dB2.1 dB2.0 dB3.4 dB2.0 dB dB 1.4 dB2.4 dB 2.6 dB dB2.1 dB1.2 dB0.9 dB2.4 dB1.4 dB dB1.3 dB0.6 dB0.8 dB1.4 dB1.7 dB dB2.6 dB2.2 dB1.7 dB1.1 dB2.4 dB dB1.5 dB2.3 dB1.1 dB1.7 dB2.3 dB Eldad Perahia, Intel CorporationSlide 9

doc.: IEEE /0364r1 Submission Observations Array gain for 3 TX antennas is typically less that 3 dBi Results can vary quite a bit even between RX antennas Large variation in time –2-3 dB variation can occur over 2.5 sec Results vary from morning measurements to afternoon measurements 90 th percentile (spatially) over 50 percentile (temporal) gain values (slide 8) –= 2.7 dB –2 dB less than 10log(3) Eldad Perahia, Intel CorporationSlide 10

doc.: IEEE /0364r1 Submission EXAMPLE ANALYSIS Eldad Perahia, Intel CorporationSlide 11

doc.: IEEE /0364r1 Submission SRC = 1; Dest = 5 RX antenna 1 Eldad Perahia, Intel CorporationSlide 12

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 13

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 14

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 15

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 16

doc.: IEEE /0364r1 Submission max array gain over angles for each time instance; CDF over all instances Eldad Perahia, Intel CorporationSlide 17

doc.: IEEE /0364r1 Submission SRC = 1; Dest = 5 RX antenna 2 Eldad Perahia, Intel CorporationSlide 18

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 19

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 20

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 21

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 22

doc.: IEEE /0364r1 Submission max array gain over angles for each time instance; CDF over all instances Eldad Perahia, Intel CorporationSlide 23

doc.: IEEE /0364r1 Submission SRC = 1; Dest = 5 RX antenna 3 Eldad Perahia, Intel CorporationSlide 24

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 25

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 26

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 27

doc.: IEEE /0364r1 SubmissionEldad Perahia, Intel CorporationSlide 28

doc.: IEEE /0364r1 Submission max array gain over angles for each time instance; CDF over all instances Eldad Perahia, Intel CorporationSlide 29