Study Of Routing Protocol Combined With MIMO Technology In Ad Hoc Networks

Ad Hoc network will play an increasingly important role in the future,but the limited network capacity has become a bottleneck problem in the application of it. MIMO (Multiple-Input Multiple-Output) technology has a significant performance advantage in transmission efficiency and reliability by its multiplexing and diversity techniques comparing with traditional SISO (Single-Input Single-Output) links, it can effectively improve the network capacity. But the current protocols are mostly designed for SISO, so how to combine MIMO with routing protocol designing in Ad Hoc networks is a hot spot nowadays.By analysising on both the diversity and multiplexing technics,further study on the tradeoff of the two technics and combination of diversity with modulation mode has been taken, thus two kinds of MIMO transmitting modes which can achieve better performance on both communication range and data rate are introduced into the designing of routing. Taking references on the advantages of MIMO links corresponding to different transmission modes, a MIMO link-based routing selection method has been designed in order to fully use link resources. Consequently, a MIMO-Combined Routing (MCR) protocol is put forward based on this routing selection method. It makes fully use of MIMO links, so as to has highly self adaptability to network environment. Through theory analysis, it can be derived that MCR protocol has advantages in throughput and delay. Finally, simulations are implemented in terms of traffic load, dynamic topology and network node density in OPNET environment, the performance advantages of MCR are further verified by the simulation results.