SC-FDMA & OFDMA in LTE Physical Layer
Journal Title: INTERNATIONAL JOURNAL OF ENGINEERING TRENDS AND TECHNOLOGY - Year 2014, Vol 12, Issue 2
Abstract
This paper provides the introduction of LTE and the key components of its physical layer. These descriptions are simplified version of the detailed descriptions provided by 3gpp. In LTE, the OFDMA is used as downlink and SCFDMA as uplink modulation schemes; with OFDM as the basic building block. OFDMA is used for achieving high spectral efficiency in communication system; whereas, SC-FDMA for uplink multiple access scheme in LTE system. This paper evaluates the performance of SC-FDMA and OFDMA of LTE physical layer by considering different modulation schemes (BPSK, QPSK, 16QAM and 64QAM) on the basis of PAPR, BER and error probability. From the simulated results, it is observed that for a particular value of SNR, the BER increases for high order modulation (16-QAM and 64-QAM) in both OFDMA and SC-FDMA. However, the lower order modulation schemes (BPSK and QPSK) experience less BER at receiver; thus lower order modulations improve the system performance in terms of BER and SNR. In terms of bandwidth efficiency, the higher order modulation accommodates more data within a given bandwidth and is more bandwidth efficient as compared to lower order modulation. Thus, there exists a tradeoff between BER and bandwidth efficiency among these modulation schemes used in LTE. It is also observed that the error probability increases as order of modulation scheme increases. Therefore, the selection of modulation schemes in adaptive modulation is quite crucial based on these results.
Authors and Affiliations
Murtadha Ali Nsaif Shukur , Maninder Pal
Keywords
Related Articles
- EP ID EP110684
- DOI -
- Views 124
- Downloads 0
High Frequency Power Optimized Ring Voltage Controlled Oscillator for 65nm CMOS Technology-Review
A voltage controlled oscillator (VCO) is one of the most important basic building blocks in analog and digital circuits. Like any other circuit, with a VCO there are a number of design requirements that need to be known...
Testing and Performance Analysis on Air Conditioner cum Water Dispenser
-The work on developing the heat pumps for space conditioning and water heating has been gone for half a century. The earlier water heating pumps and air to water heating pumps gives only hot water and space cond...
Job Scheduling Based on Virtual Abstractions in Cloud
Cloud computing is a provisioning of services in a timely, on-demand manner, to allow the scaling up and down of resources. Job scheduling is one of the major issues in the public cloud which concerns availability of res...
Performance Characteristics of Oxy Hydrogen Gas on Two Stroke Petrol Engine
In order to conserve petroleum fuels for future and to eliminate the above limitations there is a need of alter native and innovative fuel. Amongst many alternative fuels available oxy hydrogen gas and producer gas are u...
An Efficient Encrypted Data Searching Over Out Sourced Data
Searching data over Out sourcing is still an important research issue in the field of cloud computing or service oriented application ,because of retrieving the user interesting and relevant results based on the user q...