[[sigma].sub.AoA] ([degrees]) 1, 2 0.0033 2, 3 0.0028 3, 4 0.0035 4, 5 0.0032 Average 0.0032 Table 4: The colocated FM transmitters.
Finally, for the multiple antennas in modern MIMO systems, we select the best values according to the detection results of every TX-RX antenna pair
to enhance the detection accuracy and robustness.
In [7, 13], a transmit-receive antenna pair
selection at the relay is proposed, which dynamically chooses FD or HD transmission mode according to the channel conditions, and the performance outperforms the traditional FD.
Thus, for each Tx and Rx antenna pair
, the total number of measured channels is 145 x 40 = 5800.
Each scan contains 240 signals, one from each transmit-receive antenna pair
. The data is obtained by selecting a transmitting antenna, and cycling through with the remaining 15 antennas receiving; then the transmit antenna is switched and the process repeats for a total of 16 transmitting antennas with 15 receiving antennas each (16 * 15 = 240).
In multiple radar systems the time delay measured between a transmit-receive antenna pair
defines an elliptical path of possible target locations, drawn using the locations of the transmit-receive antenna pair
as the foci of the ellipse .
This corresponds to the signal from the same transmit/receive antenna pair
(x, y) in Set #2: [S.sup.2.sub.x,y].
The signal transmitted through the antenna pair
by Tx-Rx antennas separation of 3 m is used as a reference signal.
We investigate the electrical field strength in the vicinity of a single antenna and transmission through a near-field-coupled antenna pair
(typical for fire-wire and on-body communication scenarios).
They determine how many different spatial streams of traffic can be sent at one time to improve signal reception (a separate radio and antenna pair
is required for each data stream sent and received).
The effectiveness of these algorithms relies on channel reciprocity or symmetry between the uplink and downlink channels for each transmit/receive antenna pair
, the phase difference between antenna elements, and signal amplitude.
This provides frequency diversity in addition to the polarization-sense antenna diversity realized by the opposing polarization senses of the CP antenna pair
. The frequency-hopped packets generated in the traditional CDMA/FHSS efforts can be switched alternatively or applied randomly (as specified by a Bernoulli process) between RHCP and LHCP antennas.