Abstract
Third-Generation Partnership Project (3GPP) standardizes an Evolved UMTS Terrestrial Radio Access Network (EUTRAN)as air interface in its release 8 LTE. Orthogonal Frequency Division Multiple Access(OFDMA) and Single Carrier-Frequency Division Multiple Access(SC-FDMA)are key technologies for the air interface of mobile broadband systems.It is evident that mobile broadband access technologies are reaching a commonality in the air interface and networking architecture; they are being converged to an IP-based network architecture with OFDMA based air interface technology. The air interface of E-UTRAN is based on OFDMA in downlink and SC-FDMA in the uplink, making it possible to efficientl utilize bandwidth due to the orthogonally between sub-carriers and by assigning subsets of sub-carriers to individual users which allows for simultaneous data rate transmission from several users and differentiated quality of service for each user. In this paper, wehighlight the technologies behindOFDMA and SC-FDMA and also carry out performance comparison of the two air interface technologies. We brieflydescribe the 3GPP LTE standard, and its implementation using OFDMA and SC-FDMA technology.
Highlights
Orthogonal Frequency-Division Multiple Access (OFDMA) was first introduced as an air interface technology for broadband wireless systems with the Wireless MANOFDMA air interface of IEEE 802.16d in 2004 [1]
In 2010, Ciochina and Hikmet [2]published a paper, which reviewed both OFDMA and SC-FDMA technologies and did a performance evaluation of these two multiple access technologies, and concluded that OFDMA can be expected to offer a higher cell capacity, while SC-FDMA can lead to cell range extension.LTE, whose radio access is called Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), has substantially improved end-user throughputs, capacity and it has reduced user latency, users are able to have amuch improved mobile communication
This paper focuses on one of the main applications of OFDMA and SC-FDMA technology as air interface technologies for LTE mobile broadband systems.The outline of this paper is as follows:Section II gives the description of the principles of OFDMA and SC-FDMA as the multiple access system of choice for 4G systems
Summary
OFDMA was first introduced as an air interface technology for broadband wireless systems with the Wireless MANOFDMA air interface of IEEE 802.16d in 2004 [1]. Its main features are:Peak down-load rates up to 300 Mbit/s and upload rates up to 75 Mbit/s depending on the user equipment category ; Low data transfer latencies (sub-5 ms latency for small IP packets in optimal conditions), lower latencies for handover and connection setup time than with previous radio access technologies; Improved support for mobility, exemplified by support for terminals moving at up to 300 km/h or 450 km/h depending on the frequency band;OFDMA is used for the downlink, while SC-FDMA is used for the uplink for efficient power conservation;There isincreased spectrum flexibility: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz wide cells are standardized. SCFDMA combines the advantages of OFDMA with lower peak-to-average-power ratio.In view of their advantages, OFDMA and SC-FDMA are natural choices for the new LTE cellular standard
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