A COMPARATIVE ANALYSIS OF PAPR OF SC-FDMA AND OFDMA FOR LTE SYSTEMS (original) (raw)
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International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/ber-and-papr-analysis-of-ofdma-based-multiple-access-techniques https://www.ijert.org/research/ber-and-papr-analysis-of-ofdma-based-multiple-access-techniques-IJERTV2IS70711.pdf This paper presents a comprehensive performance analysis of various orthogonal frequency division multiple access (OFDMA) based schemes. We investigate the basic principle and different subcarrier allocation schemes of OFDMA i.e., interleaved OFDMA and localized OFDMA. Another multiple access scheme obtained from the combination of CDMA technique with multicarrier transmission namely multi-carrier code division multiple access (MC-CDMA) is also described. Through computer simulation, we present the Bit error rate (BER) and peak-to-average power ratio (PAPR) performance of OFDM, MC-CDMA, and OFDMA along with subcarrier allocation schemes.
Long Term Evolution (LTE), by third generation project partnership (3GPP) is one of the radio access technologies used for delivering broadband mobile services. It is mainly influenced by high data rates, minimum delay and the capacity due to scalable bandwidth and its flexibility. The downlink LTE employs orthogonal frequency division multiple access (OFDMA) as a multiple access technique. The conventional resource allocation method in OFDMA employed different modulation and coding scheme (MCS) on allocated subcarriers to achieve good throughput. But, in the downlink LTE, all scheduling blocks at a given transmission time interval (TTI) to user must adopt same MCS and these brings about constraints in the system and as a result degrade system performance. This paper reviewed several resource allocation schemes for performance analysis in downlink direction for LTE systems. In each of the schemes considered, the suboptimal solution showed a significant performance improvement compared to the optimal solution. A quality of service (QoS) guaranteed resource block(RB) allocation achieved high throughput compared to other schemes considered in this article. INTRODUCTION The evolution of Long Time Evolution-Advanced (LTE) is as a result of spanning decades of digital transmission access techniques and advances in the digital signal processing methods and technologies (Bahai, 2004). The access technologies and standards implemented in the evolution started from the first digital mobile communication systems GSM (Global System for Mobile Communications) and IS-95 (Interim Standard 95) to the true broadband wireless access systems 3GPP LTE (Long Term Evolution) and WiMAX(Worldwide Interoperability for Microwave Access). The initial access schemes (TDMA, FDMA and CDMA in different variations) converges towards the Orthogonal Frequency Multiplex Division Access (OFDMA) as the only relevant multiple access technology. OFDMA was first introduced as an air interface technology for broadband wireless systems with the WirelessMAN-OFDMA air interface of IEEE 802.16d in 2004. Although initially designed for fixed wireless applications, enhancements for mobility support in IEEE 802.16e transformed WiMAX in 2005 into Mobile WiMAX, and therefore an alternative for the established mobile cellular technologies like UMTS and 1xEV-DO. Consequently, The Third-Generation Partnership Project (3GPP) started in 2005 to develop an evolution of the Wideband CDMA based UMTS standard, called the " Long Term Evolution ". 3GPP LTE Release 8 was completed in 2008 which forms the foundation for LTE networks and historical evolution of the wireless access technology is shown in Figure 1 (Adereas at el, 2010).