# The BER of the SRD link with decodeand-forward relaying is expressed as (14.93) [27] modulation….

The BER of the SRD link with decodeand-forward relaying is
expressed as (14.93) [27]

modulation. Here, _1, _2 respectively denote the
instantaneous SNRs of SR and RD links with mean powers _1, _2.
Assuming the SRD link as a single equivalent link with bit error probability
given by Peq = Q 2_eq , show that the equivalent instantaneous SNR of the

Using the above formulas, propose a method to obtain the pdf
of _eq in terms of the

The BER of the SRD link with decodeand-forward relaying is
expressed as (14.93) [27]

modulation. Here, _1, _2 respectively denote the
instantaneous SNRs of SR and RD links with mean powers _1, _2.
Assuming the SRD link as a single equivalent link with bit error probability
given by Peq = Q 2_eq , show that the equivalent instantaneous SNR of the

Using the above formulas, propose a method to obtain the pdf
of _eq in terms of the pdfs of _1 and _2. When SR and RD links
undergo Rayleigh fading and are independent from each other, the average BEP of
the SRD link is given by (14.94):

where I(L,x) is defined by (14C.3). Assuming that the
equivalent SNR _eq is also Rayleigh fading with a mean _eq, insert
Peq,av _eq = I 1,_eq into the above BER expression and show that

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