Antenna arrays can provide diversity paths to combat multipath fading
of the desired signal as well as the interference at the intended receiver.
By supporting two LoRa Antennas the Kona Macro can utilize antenna diversity to improve receiver performance in the presence of multipath fading
and on the transmit side, multiple transmit channels can be utilized simultaneously resulting in much higher system downlink capacity.
OFDM enables robust multiple access method to conflict the impairment of wireless channels, particularly of multipath fading
, delay spread and Doppler shifts.
Furthermore, the platform's use of OFDM technology dampens the challenge of multipath fading
and obstructions in the wireless environment.
In order to combat the multipath fading
when the delay spread of channel impulse response (CIR) is large, some scenarios have been devised .
The mobile radio signal experiences several signal variations and weakens due to multipath fading
effects during transmission of data from source to destination.
I] are the channel coefficient of the target D2D pair link and that of the target D2D receiver-interfering D2D transmitter i link; we assume that all channel coefficients follow a multipath fading
that is fast, and the amplitude can be modeled by the Rician and Rayleigh distributions ,
It is well known that diversity antenna has advantages of reducing multipath fading
and increasing transmission capacity [1, 2].
In MIMO wireless communication, multipath fading
is a usual phenomenon that causes ISI in the transmitted signal.
Direct Sequence Spread Spectrum is well suited for these networks due to its anti-jamming, anti-interference and robustness against multipath fading
Note that the custom OFDM signal can be an ideal signal modeled in simulation, or it could include modeled impairments such as RF design impairments or multipath fading
A more severe multipath fading
occurs when the direct beam spreading of the signal combines with the surface reflected beam .