نتایج جستجو برای: fdma

تعداد نتایج: 542  

2015
Navjot Kaur

Throughout wireless communication systems, Orthogonal Frequency Division Multiplexing (OFDM) and also Single-Carrier Frequency Division Multiple Access(SC-FDMA) contributes a significant part. It has been adopted by a variety of future mobile communication standards like WiMAX, Long-term Evolution (LTE), LTEAdvanced and also Ultra Mobile Broadband (UMB) and many others. SC-FDMA can be interpret...

2014
Denis DUPÁK Juraj GAZDA Dušan KOCUR Mário PETRÍK

Single Carrier Frequency Division Multiplexing (SC-FDMA) scheme has been considered to be promising technology for the uplink of the 4G mobile communication systems. The main disadvantage of SC-FDMA is the high envelope fluctuation of signal resulting in a presence of nonlinear distortion in transmitted signal due to the transmitter high power amplifier (HPA). In order to improve the SC-FDMA pe...

2012
Muhammad Mokhlesur Rahman Shalima Binta Manir Fahimeh Rezaei Kah Cheng Eric Lawrey Louis Litwin Hyung G. Myung David J. Goodman Y. Yorozu M. Hirano K. Oka Rapeepat Ratasuk Amitava Ghosh Weimin Xiao Robert Love Ravi Nory Brian Classon

Long Term Evolution (LTE) is consents pliable spectrum distribution which renders enriched wireless data services to users at lower latency and multi-megabit throughput. LTE uses Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (Sc-FDMA) for downlink and Uplink transmission where OFDMA has been acquired in LTE for downlink transmission ...

Journal: :ASEAN Engineering Journal 2023

To improve the uplink performance of wireless network for long term evolution (LTE) single carrier frequency division multiple access (SC-FDMA) and orthogonal (OFDMA) are used. Two major concerns these SC-FDMA OFDMA high peak-to-average power ratio (PAPR) efficient subcarrier mapping scheme. This paper presents a comparison under different schemes which includes localized FDMA (LFDMA), distribu...

2017
Mohamed A. Aboul-Dahab Esam A. A. A. Hagras Ehab A. Lotfy EL-Henawy

SC-FDMA suffers from high Peak-to-Average Power Ratio (PAPR) problem, which restricts its usage in some applications. In this paper, a joint Discrete Cosine Transform (DCT) and hyperbolic tangent companding (HTC) technique has been studied in order to minimize the effects of the peak-to-average power ratio of the SCFDMA System. The proposed scheme utilizes a DCT rather than the conventional dis...

2015
Umar Farooq Birinderjit Singh

Due to various shortcomings of OFDM, like it is sensitive to Doppler shift, frequency synchronization problems, loss of efficiency caused by cyclic guard interval, it was endorsed to use coding algorithms like STBC which improves efficiency. Another way of increasing the efficiency is using a multiple – access technique like SC-FDMA. SC-FDMA can be described as linearly Pre-Coded OFDMA scheme, ...

2011
Wafaa Radi Hesham ElBadawy Salwa ElRamly

As the power consumption is an essential issue for designers of mobile devices The 3 Generation Partnership Project (3GPP) – Long Term Evolution (LTE) employs a multicarrier communication technique on the air interface, Single Carrier Frequency Division Multiple Access (SCFDMA), in uplink scenario and Orthogonal Frequency Division Multiple Access (OFDMA) in the downlink. SCFDMA core modulation ...

Journal: :IEEE Trans. Communications 1998
Thomas Eng Ananthanarayanan Chockalingam Laurence B. Milstein

Thomas Eng, A. Chockalingam, Member, IEEE, and Laurence B. Milstein, Fellow, IEEE Abstract— The effect of phase noise on the capacities of coherently demodulated hybrid FDMA/CDMA systems operating over a multipath Rayleigh fading channel is investigated. Using an approximate upper bound on the BER performance which has been derived and presented in a previous paper, the capacities of the FDMA/C...

2013
Renu Rani Garima Saini Anuj Kumar

The low peak-to-average power ratio (PAPR) in single-carrier systems has motivated the Long Term Evolution (LTE) Third Generation Partnership Project (3GPP) to adopt single carrier frequency division multiple access (SC-FDMA) as the uplink multiple access scheme. In this paper, an enhancement of a SC-FDMA system by decreasing the PAPR is focused. A combination of clipping and Pulse shaping (RRC...

2015
Navdeep Singh Rinkesh Mittal

In this research paper, we had studied the effect of different parameters to analyze the performance of detection of Single Carrier Frequency Division Multiple Access (SC-FDMA). We had analyzed the effects of various parameters like throughput, efficiency and error percentage while using linear receivers. Our goal was to find the simplest setting for Detection of SC-FDMA in which we had distill...

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