DFT based OFDM systems
Performance evaluation of Improvement in BER Performance using DWT Based OFDM AND DFT Based OFDM for Different Modulation Approaches
... QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. QAM is used with pulse amplitude modulation (PAM) in ...
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A New DCT based Channel Estimation Algorithm for OFDM Systems
... improved DFT based channel estimation method uses a symmetric extension in frequency domain [7] to reduce the leakage energy ...improved DFT based method degrades when more noise exists. The ...
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Reducing the Leakage in OFDM Systems by Using Low Complexity DFT- Based Channel Estimation
... II.PROPOSEDOFDM CHANNEL ESTIMATIONA Wavelet based OFDM system with beam former and MIMO configuration is explained in this section. Figure1 shows the transmitter and receiver part respectively with k=8 ...
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MIMO OFDM with Enhanced Channel Estimation based on DFT Interpolation
... communication systems, the transmitter send the information out through a multipath fading ...both based on comb type pilot arrangement to estimate the channel effect at pilot locations, and channel ...
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DFT - based channel estimation for OFDM system and comparison with LS and MMSE over Rayleigh and Rician fading channel
... a DFT-based channel estimation approach is simulated and comparing with conventional channel estimation techniques, Least Square (LS) and Minimum Mean Square Error (MMSE) over Rayleigh and Rician fading ...
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PAPR Reduction Method for OFDM Based Massive MIMO Systems
... ”tone-reservation”), which will be used to compensate for a (deliberate) clipping of the signals on the remaining antennas. In terms of signal processing, an advantage is that even though there is a quite large number of ...
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Amplitude reconstruction of clipped OFDM by using DFT-based least squares
... most DFT-based least square methods, such as in ...of OFDM systems and nds applica- tion with other structures including single-carrier and ...
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Performance Evaluation of DWT-OFDM and DFT-OFDM in Multipath PLC Channel
... communications systems operate by adding a modulated carrier signal to the wiring ...(DWT) based modulation technique, hence the quality of data communication over the noisy in-home power line network can ...
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DFT Based Channel Estimation with Symmetric Extension for OFDMA Systems
... In OFDM system, the entire channel is divided into many narrow subchannels, which are transmitted in parallel, thereby increasing the symbol duration and reducing the ...Various OFDM channel estimation ...
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OFDM –DWT
... communication systems due to thespectral bandwidth efficiency and robustness to frequencyselective fading ...Transform based OFDM (DWT-OFDM) systemswhen the signals are passed through a ...
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Analysis of PAPR in Precoded OFDM Systems for M - QAM
... DHT-Precoder Based OFDM system with DFT-Precoder Based OFDM system, WHT-Precoder Based OFDM system, SLM- OFDM (with V=2) system and OFDM-Original system for ...
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BER Analysis of Wavelet Based OFDM and SC-FDMA for 4th Generation LTE Using Various Modulation Techniques
... the OFDM and SC-FDE ...SC-FDMA systems; interleaved sub-carriers mapping and localized sub- carriers ...in DFT based ...of DFT based OFD system with the BER performance of ...
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Efficient Interleaver Design for MIMO-OFDM based Communication System on FPGA
... communication systems on ...MIMO- OFDM based communication systems are multiplied for 2×2 MIMO systems without utilizing the transmit ...
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Channel Estimation Based On Compressive Sensing In Ofdm Systems
... to OFDM sparse channel estimation. In the paper [8], OFDM sparse channel estimation method based on the orthogonal matching pursuit (OMP) algorithm was ...
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Subcarrier allocation based simultaneous wireless information and power transfer for multiuser OFDM systems
... Orthogonal frequency division multiplexing (OFDM) is the viable air interface for providing the high spectral ef- ficiency and ubiquitous communication services because of its ability to combat frequency selective ...
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Joint CFO Estimation and Data Detection in OFDM systems
... was based on a linear search method was ...updated based on the minimum mean-squared error (MMSE) ...EM- based algorithm that still separately performed CFO estimation and data detection was ...for ...
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Degenerated Inverse Matrix Based Channel Estimation for OFDM Systems
... of our proposed scheme approaches perfect channel state information (CSI), within a maximum of 0.4 dB degradation, regardless of the delay spread of the channel, Doppler frequency, and subcarrier modulation. Furthermore, ...
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Low-cost frequency-agile filter bank-based multicarrier transceiver implementation
... are based on discrete Fourier transform (DFT) modulated filter banks [8,15] and derivative version [18], but also include iterated halfband schemes such as in ...FBMC systems that are reported in the ...
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Implementation of BER Performance in SFBC/STBC Based On QAM-OFDM Detection Techniques in OFDM Systems
... in OFDM multiplexing is applied to independent signals but these independent signals are a subset of one main ...Therefore OFDM is a combination of modulation and multiplexing with better immunity to ...
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Training Based Channel Estimation in MIMO OFDM Systems
... Superimposed training (ST) based channel estimation techniques have been proposed in [4,5]. In this section, a novel method consisting of a technique to refine the channel estimate at the transmitter in a ST ...
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