E??“2
1.E??“1
9 10 11 12 13 14 15 16 17 18
Eb/No (dB)
BER
DQPSK
Pb(8DPSK)-DD
MLDD (3 Sym)
MLDD (5 Sym)
Pb(8DPSK)-CD
2 Symbols
3 Symbols
5 Symbols
FIGURE 4.43 MLDD detector performance for 8DPSK in an AWGN channel.
We also have plots for BER approximations of the
various BT product curves using the following familiar
formula [39].
(4.157)
With the use of Table 4.3, there is good agreement to the
simulations performed over the BER range of interest.
Pe Qa?…a # Eb
Nob
212 CHAPTER FOUR
MBO-NC
1.0E??“6
1.0E??“5
1.0E??“4
1.0E??“3
1.0E??“2
1.0E??“1
10 9 8 7 6 5 4 3 21 111213
Eb/No (dB)
BER
Pb(FSK)-NC
FSK-MBO (3)
FSK-MBO (5)
Pb(BPSK/QPSK)
FIGURE 4.45 Noncoherent MBO detector performance for FSK in an AWGN channel.
MBO-CD
1.0E??“5
1.0E??“4
1.0E??“3
1.0E??“2
1.0E??“1
Eb/No (dB)
BER
Pb(FSK)-CD
FSK-MBO(2)
FSK-MBO(3)
FSK-MBO(5)
0 1 2 3 4 5 6 7 8 9 10 11
FIGURE 4.44 Coherent detection using MBO for FSK in an AWGN channel.
TABLE 4.3 GMSK BER Performance
Approximation Parameters
Modulation Alpha value
Coherent QPSK 2
MSK 1.7
GMSK (BT 0.25) 1.36
GMSK (BT 0.2) 1
4.5.2 Multipath Fading Performance
In this section we will present the BER performance of DQPSK using the DD technique in a flat
Rayleigh fading channel.
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