Adaptive Interference Nulling and Direction of Arrival Estimation in GPS Dual-Polarized Antenna Receiver - Adaptive Signal Processing in Wireless Communications - page 416

20

MVDR
Beam towards -5 Degrees
Beam towards 5 Degrees
Beam towards 20 Degrees
Beam towards 27 Degrees

10

0

-10

-20

-30

-40

-100 -80 -60 -40 -20 0

Angles of arrival (deg)

20 40 60 80 100

0

-5

-10

-15

-20

-25

-30

-35

MVDR
Beam towards -5 Degrees
Beam towards 5 Degrees
Beam towards 20 Degrees
Beam towards 27 Degrees

-40

-45

-50
-100

-80 -60 -40 -20

Angles of arrival (deg)

0 20 0 0 0 00

FIgure 14.3 (Top) RHCP array response with single and multiple MVDR methods with five
RHCP and seven horizontally polarized interferences. (Bottom) Horizontally polarized array
response with single and multiple MVDR methods with five RHCP and seven horizontally polar-
ized interferences.

RHCP interferers, whereas the multiple MVDR beamforming method, due to the exis-
tence of a sufficient number of degrees of freedom, places deep nulls at all interferer
DOAs. Figure 14.3(b) demonstrates that both single and multiple MVDR methods null