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

SRD link is given by

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

SRD link is given by

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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