
CHAPTER 2
Reliability of
Cooperative
Transmission
Zhiguo Ding, Newcastle University, UK
Zhengguo Sheng, University of British Columbia, Canada
2.1 SYSTEM MODEL
We start with a direct transmission link as depicted in Figure 2.1(a) and as-
sume the channel model incorporating path-loss and Rayleigh fading. The
received signal at the destination
d is modeled as
y
d
[n]=a
s,d
x
s
[n]+n
d
[n], (2.1)
where x
s
[n] is the signal transmitted by a source s, n ∈ [1, ..., N ] is the index
of the transmitting packet, and
n
d
[n] is additive white Gaussian noise, with
variance
σ
2
n
, at the receiver. The channel gain a
s,d
between the nodes s and d
is modeled as a
s,d
= h
s,d
/d
α/2
s,d
,whe