Cooperative Communications in Random Access Networks - Adaptive Signal Processing in Wireless Communications - page 333

10

9

8

7

Node 3

6

Node 4

Node 1

5

Node 2

4

3

2

1

0

0 2 4 6 8 10

Meters

(a)

6000

Node 2

4000

Firing
instant

2000

0

0 20 40 60 80 100

6000

4000

Node 3

2000

0

0 20 40 60 80 100

10000

Node 4

5000

0

0 20 40 60 80 100

Seconds

(b)

FIgure 11.12 Demonstration of the signal at nodes 2-4. (a) Node location; (b) OLA signals
received at nodes 2-4.

Biological networks are widely believed to be near optimal as a result of elimination
and evolution. It is interesting to see how the efficiency of communication systems can
be improved by emulating these biological networks. Discussions on these issues can be
found in [36, 37] and the references therein.