ICI Reduction in OFDM Systems Using Phase Modified Sinc Pulse

Abstract

This paper is focused on the problem of reducing the intercarrier-interference (ICI) power in the transmission over Orthogonal Frequency Division Multiplexing Systems (OFDM) using pulse shaping methods. A new pulse was proposed here and it was investigated in terms of ICI interference. It appears to be suitable for transmission in OFDM systems with carrier frequency offset. The results obtained by calculations show that the performance improvements are significant for reducing average intercarrier-interference (ICI) power and increasing the ratio of average signal power to average ICI power (SIR).

Performance Enhancement of OFDM-Based Systems Using Improved Parametric Linear Combination Pulses

“…In general, we can conclude that the NW function outperforms the rest of the pulses in terms of ICI and SIR power because its frequency response decays faster than the other pulses, as depicted in Fig. 8 [20,21,24,30]. It can be seen in Fig.…”

“…The ratio of average signal power, P Df ð Þ j j 2 , to average ICI power is denoted as SIR, and it is expressed as follows [23,24] SIR ¼…”

“…8 and 9, respectively. For comparison purposes, the design parameters used in this paper for the SP [23], ISP [24], NW [23], and PW [23] pulses are the ones that provide the best performance in OFDM-based systems. Therefore, we compare the IPLCP with the SP, ISP, NW, and PW pulses.…”

“…The use of Nyquist-I pulses to reduce the ICI power in OFDM-based systems has been studied, proposed, and implemented by several scholars [10,11,19]. Pulses such as the raised cosine (RC) pulse, 'better than' raised cosine (BTRC) pulse [20], sinc power (SP) pulse [21], improved sinc power (ISP) pulse [22], new windowing function (NW) [23], and the phase modified sinc pulse (PM) [24] have been proposed, among others. The ISP pulse is characterized by having two design parameters, whereas the PM and NW have four.…”

Family of Nyquist-I Pulses to Enhance Orthogonal Frequency Division Multiplexing System Performance

“…A pulse with a modified phase of the sinc function, known as phasemodified sinc power (PMSP) pulse [22], was proposed to further minimize the side lobes with a broader main lobe by enabling the system to perform even better in reducing ICI power and BER than ISP. However, the side lobes of ISP and PMSP pulses are not sufficiently small to provide highly minimized ICI power at low amplitude a. SP, ISP, and PMSP pulses are only defined in the frequency domain.…”