Papers by zahra sharifian
IEEE Wireless Communications Letters, 2016
Similar to the widely used orthogonal frequency division multiplexing (OFDM) systems, Generalized... more Similar to the widely used orthogonal frequency division multiplexing (OFDM) systems, Generalized frequency division multiplexing (GFDM) suffers from a high peak-to-average power ratio (PAPR). In this paper, we propose a data-independent precoder to minimize the variance of the instantaneous power (IP), subject to the constraint of unchanged average IP as a means for PAPR reduction. Simulation results show that the proposed precoder can reduce PAPR without any increase in out of band (OOB) radiation or bit error rate (BER) degradation. Compared with the existing solutions, the proposed technique provides an improved PAPR performance. Furthermore, an efficient implementation of the proposed precoding technique is introduced. A thorough computational complexity analysis of different PAPR reduction methods is also presented in this paper.
2015 23rd Iranian Conference on Electrical Engineering, 2015
GFDM (generalized frequency division multiplexing) is a non-orthogonal waveform that is being dis... more GFDM (generalized frequency division multiplexing) is a non-orthogonal waveform that is being discussed as a candidate for the fifth generation of wireless communication systems (5G). GFDM is a multicarrier technique with circular pulse shaping that is designed in a way to address emerging applications in 5G networks such as Internet of Things (IoT) and machine-to-machine communications (M2M). The same as other multicarrier systems, GFDM suffers from a high peak to average power ratio (PAPR). To attack PAPR problem, in this paper, we propose a polynomial based companding method with iterative expansion that is called polynomial-based companding technique (PCT). Based on our simulation results, a great amount of PAPR reduction can be achieved through utilization of our proposed technique. Through simulations, we have also investigated the bit error rate (BER) performance of the system while adopting our PCT method. Our simulations reveal that there is a tradeoff between PAPR reduction and BER performance.
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Papers by zahra sharifian