Author(s): Kokil Dhiman, Tarun Gulati
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Vol.1 - Issue 6 (August- 2012)
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multicarrier modulation which is particularly suited for transmission over a dispersive channel. It offers several advantages, because of which it is widely used in recent years. However, it has few limitations with the key one is peak-to-average-power ratio (PAPR), which determines the system°«s power efficiency. High PAPR is one of the major drawbacks in OFDM systems, which causes a significant level of signal distortions, when the modulated signals are amplified through high power amplifiers (HPAs). In particularly, high PAPR increases the complexity of Analogue to Digital (A/D) and Digital to Analogue (D/A) converters and also reduces the efficiency of RF High Power Amplifier (HPA). Therefore, PAPR reduction is very essential. For this purpose, a Zadoff-Chu matrix Transform (ZCT) based precoding and postcoding techniques are quantitatively evaluated in this paper in terms of its parameters q and r. From the analysis, it is inferred that an optimum selection of q and r can lead to a significant level of reduction in PAPR.
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