Hybrid Combining of Directional Antennas for Periodic Broadcast V2V Communication

A hybrid analog-digital combiner for broadcast vehicular communication is proposed. It has an analog part that does not require any channel state information or feedback from the receiver, and a digital uses maximal ratio combining (MRC). We focus on designing of to optimize received signal strength along all azimuth angles robust periodic vehicle-to-vehicle (V2V) communication, in scenario one dominant component between communicating vehicles (e.g., highway scenario). show parameters previously suggested fully solves optimization problem proposed combiner. Assuming $L$ directional antennas with uniform angular separation together special case two-port we it optimal combine groups $\lceil L/2\rceil$ $\lfloor L/2\rfloor$ domain feed output each group port. This shown be under sufficient condition sidelobes level antenna. Moreover, derive performance bound guide choice needed meet reliability requirements V2V links.