نتایج جستجو برای: fdma
تعداد نتایج: 542 فیلتر نتایج به سال:
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...
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...
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 ...
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...
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...
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, ...
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 ...
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...
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...
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...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید