The value of [alpha] in case of the HMID decoder for the first two situations is chosen to be 1.2, which was found to give performances similar or better than TID for the entire domain of SN[R.sub.sd] values, when A=0.1.
BER and FER curves for relay turbo coded system (with HMID when [alpha]=1.2 or TID when [alpha]=0, SN[R.sub.sr] =7 dB, SN[R.sub.rd] =2 dB) and for direct link, when MAWCAIN channels parameters are A=0.01 and T=0.01 are given in Figs.
BER and FER curves for relay turbo coded system (with HMID, when [alpha]=1.2 or TID, when [alpha]=0, SN[R.sub.sr] =7 dB, SN[R.sub.rd] =2 dB) and for direct link, when MAWCAIN channel parameters are A=0.01 and T=0.1 are given in Figs.
For example, for BER=[10.sup.-5], when using HMID with [alpha]=1.2, the additional encoding gain, as opposed to the direct link, is 4.09 dB, and the TID decoder brings an additional gain of 1.91 dB, as opposed to TID.
5, the same observations regarding the changing value of [alpha] for HMID are maintained.
BER and FER curves for the relay turbo coded system (with HMID when [alpha]>0 or TID when [alpha]=0, SN[R.sub.sr] =20 dB or 28 dB, SN[R.sub.rd] =10 dB) and for direct link, when MAWCAIN channels parameters are A=0.1 and T=0.01 are given in Figs.