Abstract:
The SEP performance of digital modulation schemes of MPSK, MFSK, MSQAM and
MXQAM is presented in this Thesis report over Additive White Gaussian Noise (AWGN)
channel and fading channels (Rayleigh, Nakagami-m, Nakagami-q and Nakagami-n). The
SEP expressions are derived in terms of Moment Generating Functions and Q-functions
which are easily understandable. This SEP performance is evaluated for different
number of symbols and adequate analysis is provided for communication designers for
the choice of modulation scheme on the basis of the available SNR.
In this context, cross QAM, Square QAM, FSK, PSK will be analyzed over Additive white
gaussian noise and the fading channels which includes Rayleigh, Nakagami-m,
Nakagami-q, Nakagami-n and Beckmann. SEP performance of cross QAM is optimized
by making use of multiple diversity combining techniques including selection
combining, maximal ratio combining and generalized selection combining. For Equal
Energy Case over all the previously described fading channels the SEP performance of
cross and rectangular QAM has been compared. These modulation techniques also has
many applications where XQAM used in blind equalization, here channel's impulse
response is estimated by the equalizer without knowing past knowledge about the
channel behavior.
