Journal ArticleDOI
Single carrier FDMA for uplink wireless transmission
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TLDR
Among the possible subcarrier mapping approaches, it is found that localizedFDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (JFDMA), however, the PARR performance of IFDMA is better than that of LFDMA.Abstract:
Single carrier frequency division multiple access (SC FDMA), a modified form of orthogonal FDMA (OFDMA), is a promising technique for high data rate uplink communications in future cellular systems. SC-FDMA has similar throughput performance and essentially the same overall complexity as OFDMA. A principal advantage of SC-FDMA is the peak-to-average power ratio (PARR), which is lower than that of OFDMA. SC FDMA is currently a strong candidate for the uplink multiple access scheme in the long term evolution of cellular systems under consideration by the third generation partnership project (3GPP). In this paper, we give an overview of SC-FDMA. We also analyze the effects of subcarrier mapping on throughput and PARR. Among the possible subcarrier mapping approaches, we find that localized FDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (JFDMA). However, the PARR performance of IFDMA is better than that of LFDMA. As in other communications systems there are complex tradeoffs between design parameters and performance in an SC-FDMA systemread more
Citations
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Proceedings ArticleDOI
Uplink Power Control for an OFDMA Mobile Cellular System
TL;DR: In this article, the effects of uplink closed-loop power control in a mobile cellular system that employs OFDMA multiple access for the uplink were investigated, and analytical results were derived to compare open-loop with closed-loops power control approaches.
Proceedings ArticleDOI
Three-Time-Slot Quasi-Orthogonal Space-Time Block Codes
TL;DR: A class of quasi-orthogonal space- time block codes (Q-STBC) is proposed for systems with 2 antennas and 3 time slots, where the orthogonal Alamouti code can not be applied due to the odd symbol problem inherited in the 3GPP frame structure.
Journal ArticleDOI
A joint resource optimization and adaptive modulation framework for uplink single-carrier frequency-division multiple accesssystems
Ayaz Ahmad,Nadir Shah +1 more
TL;DR: A novel optimization framework for the solution of joint resource allocation and adaptive modulation in single‐carrier frequency‐division multiple access systems, which is adopted as the multiple access scheme for the uplink in the 3GPP Long Term Evolution standard is proposed.
Proceedings ArticleDOI
PAPR Analysis for Single-Carrier FDMA MIMO Systems with Space-Time/Frequency Block Codes
TL;DR: Results reported in this paper show that IFDMA(Interleaved FDMA) has the best PAPR characteristics, LFDMA(LocalizedFDMA) is the worst but still better than that of OFDMA in STBC/SFBC SC-FDMA MIMO system and it is found that the P APR increases along with the increase of DFT input block size in such a system.
Proceedings ArticleDOI
Optimal Joint Subcarrier and Power Allocation in NOMA is Strongly NP-Hard
TL;DR: In this article, the authors investigated the computational complexity of joint subcarrier and power allocation problems in multi-carrier NOMA systems and proved that these problems are strongly NP-hard for a large class of objective functions, namely the weighted generalized means of the individual data rates.
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