Power Efficient
Wireless is unrelieable, high BER
Leads to high power consumption
Use Co-operative Diversity (spatial diversity)
Does this lower transmission power of individual nodes?
hardware – Mulitple antenna on every node, minimum distance between antennas should be l/2 = 6.12 cm
software – Space -time codes, two dimensional array
Nodes with single antennas cop-operate to create a virual MIMO, which gives the same effect [Laneman et al]

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