Hybrid Mapping Scheme for Recent Orthogonal FDMA Schemes

F S Al-Kamali

doi:10.4236/ijcns.2013.63018

Abstract

Single-carrier frequency-division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA) systems are new orthogonal multiple access systems. They have been adopted in the 3GPP long term evolution (3GPP-LTE). In these systems, there are only two types of subcarrier mapping schemes which are the interleaved and the localized. So, introducing a new subcarrier mapping scheme is an important issue, which is the main objective of this paper. In this paper, a hybrid subcarrier mapping scheme is proposed and examined for the SC-FDMA system. Monte Carlo simulations are performed to compare the performance of the proposed scheme with that of the interleaved and the localized schemes. It is shown that a hybrid scheme provides better performance than that of the localized and the same performance as that of the interleaved scheme and increased robustness to carrier frequency offset (CFO) at the expense of increased envelope fluctuations.

Highlights

Orthogonal FDMA multiple access systems such as the Single-carrier frequency-division multiple access (SC-FDMA) and the orthogonal frequency division multiple access (OFDMA) are attracting much attention for the recent physical layer protocols in highspeed wireless networks due to theirs advantages over the conventional FDMA multiple access system
This paper has introduced a hybrid subcarrier mapping scheme for SC-FDMA system
Simulation results for uplink SC-FDMA system demonstrate the effectiveness of the proposed Hybrid FDMA (HFDMA) scheme

Summary

Introduction

Orthogonal FDMA multiple access systems such as the SC-FDMA and the OFDMA are attracting much attention for the recent physical layer protocols in highspeed wireless networks due to theirs advantages over the conventional FDMA multiple access system. These multiple access systems have been employed for the physical-layer protocol in 3GPP-LTE [1]. We will refer to the localized SC-FDMA system as LFDMA, and the interleaved SC-FDMA system as IFDMA. An efficient subcarrier mapping method, named Hybrid FDMA (HFDMA), is proposed which holds the same performance as the IFDMA scheme, and overcomes its shortcomings.

SC-FDMA System Model

The Proposed HFDMA Scheme

Simulation Results

Conclusion