OFDM-based
Energy efficiency of Optical OFDM-based networks
... of OFDM-based wireless systems, ...optical OFDM- based networks is not a well investigated ...adaptive OFDM. In this work we investigate the energy efficiency of optical OFDM- ...
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Development of OFDM based Cooperative Communication System for Mitigation of Effect of Carrier Frequency offset
... OFDM is a technique to against the frequency-selective fading or narrowband interference in wireless communication, thus improving the system reliability. This technique allows data to be transmitted in parallel ...
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CHANNEL ESTIMATION OF OFDM BASED SYSTEM USING PILOT ASSISTED NEURAL NETWORKS
... Now OFDM is widely used for high-speed communications over frequency selective ...channels. OFDM divides the high data rate stream into parallel lower data rate and hence prolongs the symbol duration, thus ...
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A Review On Precoder In Ofdm Based Cognitive Radio
... Cognitive radio can imerging as the technology which alleviates the problem of spectrum scarcity.Orthogonal Frequency Division Multiplexing (OFDM) is a ideal transmission technique for Cognitive Radio (CR) ...
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Green virtual network embedding in optical OFDM cloud networks
... Optical OFDM (O-OFDM) based networks provide fl exible bandwidth by supporting the allocation of a variable number of subcarriers and adapting the modulation format of subcarriers, resulting in signi ...
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Performance Evaluation of Free Space Optical Wireless Communication
... namely OFDM–PSK (phase shift keying) and QAM (quadrature amplitude modulation) in weak turbulence conditions is ...for OFDM based FSO transmission compared to RF based wireless ...
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Green optical orthogonal frequency-division multiplexing networks
... optical OFDM-based ...optical OFDM-based ...the OFDM transponder power consumption, the results show that optical OFDM-based networks under a symmetric traf fi c demand ...
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Design and comparison of new DWT – OFDM with conventional based system
... conventional OFDM system through the design of OFDM system based on wavelet ...wavelet based OFDM system is proposed which uses discrete wavelet transform (DWT) instead of ...
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Compressed sensing based channel estimation for ACO OFDM visible light communications in 5G systems
... In this paper, we propose a compressive sensing (CS)-based channel estimation technique for asymmetrically clipped optical-orthogonal frequency division multiplexing (ACO-OFDM) visible light communications ...
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Peak to Average Power Ratio Reduction Techniques for OFDM Signals
... OFDM has been proved to be a suitable technique for wireless communication due to its spectral efficiency and resistance to channel impairments. However it suffers from high PAPR. Despite two decades of continuous ...
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OFDM UMTS Based LTE System
... II. UMTS L ONG T ERM E VOLUTION - LTE Release 8 deliberations focus on the Long Term Evolution (LTE). In the Radio Access Network (RAN), the LTE goals are data rates “up to 100 Mbps in full mobility wide area deployments ...
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OFDM-STBC Based Transceiver for WiMAX 802.16e
... of OFDM with 512 subcarriers and 2x2 STBC MIMO transceiver for WiMAX ...tool based on VHSIC Hardware Description Language (VHDL) on ...WiMAX OFDM-based ...(STBC) based on 16 QAM over ...
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An improved method of mimo ofdm channel estimation using chaotic pilot sequence
... High data rate transmission, spectral efficiency and reliability are necessary for future wireless communication systems. MIMO-OFDM (multiple input multiple output- orthogonal frequency division multiplexing) ...
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Deep Learning-Based Detector for OFDM-IM
... classical OFDM technology. In OFDM-IM, only a subset of sub-carriers are activated to convey information bits via not only active sub-carriers but also their ...enables OFDM-IM to enjoy higher ...
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Performance evaluation of Improvement in BER Performance using DWT Based OFDM AND DFT Based OFDM for Different Modulation Approaches
... systems. OFDM offer high spectral efficiency, immune to the multipath delay, low inter-symbol interference (ISI), immunity to frequency selective fading and high power ...merits OFDM is chosen as high data ...
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Comparative Analysis of DWT Based OFDM System with DCT Based OFDM System for Image Transmission and Compression
... In OFDM, high-speed data stream is divided in to narrow band data flow. OFDM symbol comprises a QAM or PSK ...spread, OFDM offers inter-symbol interference (ISI) free ...of OFDM is that it ...
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PAPR Analysis of FFT and Wavelet based OFDM Systems for Wireless Communications
... We can have all the benefits of OFDM if we replace traditional sinusoid carriers of the Fourier based OFDM with suitable wavelets, in addition to that, PAPR can be greatly reduced in wav[r] ...
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Space Time Block Coded Adaptive Modulation Aided OFDM
... To elaborate a little further, from Figure 4 and 5 we surmise that fixed modulation schemes might become more attractive, when the diversity order increases, which is achieved in this case by employing more receivers. ...
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FPGA based Reconfigurable Radix 4 and Radix 22 FFT Architecture for WiMAX
... Field-programmable gate-array (FPGA) devices are widely used in signal processing, communications, and network applications because of their reconfigurability and support of parallelism. FPGA has at least three ...
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Performance Analysis of MIMO OFDM and MISO OFDM System based on STBC Code
... In this process MIMO-MISO system using inverse fast Fourier transform (IFFT) and fast Fourier transform (IFFT), respectively. Power spectral density (PSD) is useful tool which directly calculated by FFT method and it is ...
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