Cooperative MIMO Schemes Optimal Selection for Wireless Sensor Networks

Abstract

A cooperative MIMO scheme selection is proposed for wireless sensor networks where energy consumption is the most important design criterion. Space-Time Block Codes are designed to achieve maximum diversity for a given number of transmit and receive antennas with very simple decoding algorithm. In radio fading channel, STBC require less transmission energy than SISO technique for the same Bit Error Rate and can be employed practically in Wireless Sensor Networks by using the cooperative MIMO scheme. Considering Alamouti and Tarokh space-time block codes, the number of antennas at both the transmission and the reception sides are selected with respect to the transmission distance. By using cooperative MIMO transmission instead of SISO, it is shown that the distance between nodes can be increased and a large amount of the total energy can be saved for middle and long distance transmission. The energy efficiency of cooperative MIMO over SISO and multihop SISO is proved by simulations, and a multi-hop technique for cooperative MIMO is also proposed for good energy-efficiency and limited number of available cooperative nodes.

Energy Efficient Cooperative MAC Protocols in Wireless Sensor Networks

“…We can observe that the increase of energy consumption is small as M increases even when we increase M from 2 to 10 nodes. As long as the nodes are operating within an optimal range during cooperative communication (Nguyen et al, 2007), the small circuit energy can be tolerated in a cooperative low duty cycle MIMO system. The impact of N is shown in Figure 9.…”

Optimal Cooperative MIMO Scheme in Wireless Sensor Networks

“…al, 2004;Nguyen et. al., 2007): energy expended during running the transceiver circuits, P c and energy expended during packet transmission, P t .…”

Combined IEEE 802.15.4 Physical Layer and Virtual Multiple Input Multiple Output (VMIMO) Transmissions for Energy Efficient Wireless Sensor Networks

“…They studied different MIMO modulation schemes and transmission scenarios for the purpose of allowing nodes cooperation which reduced the transmission power consumption. The use of V-MIMO increases the distance between nodes and reduces power consumption for a large sensing field which requires long distance transmissions [11].…”