Abstract:
In this thesis, different types of carrier aggregation techniques available in 4G and 5G is
discussed briefly. Generation of all types of carrier aggregated signal is carried out along
with discussion of design challenges of the terminal transmitting these aggregated carriers.
The non-linearity of the power amplifier present on transmitter side is responsible for
the interference in adjacent channels (in-band and out of band emissions). Digital Predistortion
(DPD) technique has been applied to linearize this power amplifier to overcome
this problem of interference. 1D-DPD and 2D-DPD technique has been applied in case of
intra-band and inter-band carrier aggregation respectively. The performance analysis of
DPD technique has been carried out by NMSE and ACPR table obtained after comparing
power spectral density plots of the measured output through power amplifier and the
overall linearized output. The effect of input power backoff on the distortions introduced
by power amplifier has been also investigated by plotting ACPR and NMSE with relative
input power backoff for all types of carrier aggregation
