Abstract: n this paper, we proposes a modified OFDM, CPD-OFDM (Orthogonal Frequency Division Multiplexing with cross polarization diversity structure), system combating the system performance degradation due to the frequency offset. The cross polarization diversity structure composed with 2-pairs cross polarized circular antenna in each transceiver has the characteristic that it can remarkably remove the odd time reflected waves in each receiving end. The cross circular polarization diversity structure can reduce the time delay spread and ICI. Therefore, the proposed CPD-OFDM system can improve the system performance as well as the spectrum efficiency. In order to investigate the performance improvement of OFDM system due to the frequency offset, computer simulation and theoretical analysis were conducted. From this analysis, it can be seen that the CPD-OFDM system performance has been improved by 1～3 [dB] compared to that of the conventional OFDM system.

• Publication Date: 28-May-2017
• DOI: 10.15224/978-1-63248-121-4-05
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Abstract: Split ring resonators (SRR) are being researched for material sensing applications recently. These structures are easily fabricated and offer moderate quality factor (Q) and resonant frequencies (ƒr). These structures provide limited tunability of ƒr although considerable variation in Q has been established. A simulation based analysis has been carried out to find most appropriate and practical configuration of SSRs to provide considerable shift in ƒr. Simulation results show efficacy of vertically stacked SRR vis-à-vis others configurations to achieve tunability.

• Publication Date: 28-May-2017
• DOI: 10.15224/978-1-63248-121-4-06
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• Downloads: 0