Abstract:
Filtered Orthogonal Frequency Division Multiplexing is a strong contender waveform for fifth generation
communications. In F-OFDM, total allocated bandwidth is riven into numerous sub-bands and diverse kinds
of services are engaged in these sub-bands by using appropriate waveform and numerology, resulting in
better spectrum utilization. F-OFDM avoids the restrictions of OFDM and also achieves the novel
challenges encountered in 5G waveform. Just like OFDM, F-OFDM suffer from a high PAPR, which
requires the usage of HPA with extended dynamic range at the transmitter, which increases both cost and
power. There are many reduction techniques that lessen PAPR, but at the cost of degradation in BER. Partial
Transmission Sequence (PTS) and Selective Matching (SLM) methods are widely used to decrease PAPR,
but these two algorithms are complex and inefficient, because secondary information is required to be
transmitted to receive the information at the receiver. Clipping and filtering are simplest of all reduction
methods, but they involve signal distortion that causes data loss. Tone injection and tone reservation
techniques are less complex but due to some data loss, the degradation of BER is even greater. The
precoding method is easy to implement, but there is a certain data rate loss and also computationally
complex. In this thesis significant companding techniques have been considered for PAPR reduction in FOFDM. Both A-law and µ-law companding techniques have proven decent reduction in PAPR however
their BER degradation is high. Exponential companding has the maximum BER degradation among the
companding techniques mentioned in this thesis however has appropriate PAPR reduction.
