Time domain equalization for underwater acoustic OFDM systems with insufficient cyclic prefix
báo cáo hóa học: " Study of stability of time-domain features for electromyographic pattern recognition" pptx
... article as: Tkach et al., Study of stability of time-domain features for electromyographic pattern recognition Journal of NeuroEngineering and Rehabilitation 2010, 7:21 Page 13 of 13 ... the robustness of EMG pattern classification by identifying robust sets of EMG features The experiments of this study were designed with the aim of examining the stability of EMG features under ... accuracy for all of the features (Figure 3A) Stability of individual features with respect to the level of muscle contraction effort is demonstrated in Figure 3B Compared with the performance...
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Báo cáo hóa học: " Precoding and Transmitter-Side processing techniques for multiuser MIMO OFDM systems with special emphasis on the PAPR problem" pdf
... Wunder et al.: Precoding and Transmitter-Side processing techniques for multiuser MIMO OFDM systems with special emphasis on the PAPR problem EURASIP Journal on Advances in Signal Processing 2011 ... combined with basis selection algorithm for PAPR reduction Similarly, in the multiuser MIMO OFDM uplink with DFT pre-coding, the joint problem of maximum throughput and PAPR reduction is tackled in the ... fundamental bounds on the potential gains due to coding for the PAPR problem The analysis of an alternative metric instead of PAPR is the topic of the paper On the EVM Computation of Arbitrary...
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Báo cáo hóa học: " Frequency-domain equalization for OFDMA-based multiuser MIMO systems with improper modulation schemes" docx
... curve for a QPSK system with the conventional receiver is also provided for a baseline comparison Note that for the conventional receiver, the BER performance for an OQPSK system is the same as for ... improved FDE algorithm for an OFDMA-based multiuser MIMO system with −1 10 −2 BER 10 −3 10 −4 10 4ASK Conv QPSK Conv 4ASK Impr 10 15 20 Eb/N0 [dB] 25 30 35 Figure BER performance for the uplink of ... subcarriers in the studied OFDMA-based multiuser MIMO system Due to cochannel interference (causing the channel matrix H to be non-diagonal), we need to perform joint equalization for the transmitted...
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Báo cáo hóa học: " Preamble and pilot symbol design for channel estimation in OFDM systems with null subcarriers" pdf
... band are set to be null, i.e., no information is sent [12] The presence of null subcarriers complicates the design of both the training preamble for channel estimation and pilot symbols for pilot- aided ... a candidate for pilot symbols design in OFDM systems with null subcarriers VII Conclusion We have addressed the design of optimal preamble as well as suboptimal pilot symbols for channel estimation ... norm-based design for the preamble as well as for the pilot symbol design Next, we consider pilot symbol design for IEEE 802.16e by minimizing the LS channel estimate MSE Figure shows the designed pilot...
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Báo cáo hóa học: " Research Article Novel Techniques of Single-Carrier Frequency-Domain Equalization for Optical Wireless Communications" doc
... performance of optical OFDM The nonlinear characteristic of an LED imposes limitations on the performance of indoor DOW systems when using intensity modulation with both ACOOFDM and DC-biased OFDM ... “Comparison of asymmetrically clipped optical OFDM and DC-biased optical OFDM in AWGN,” vol 12, no 5, pp 343–345 [10] H Elgala, R Mesleh, and H Haas, “A study of LED nonlinearity effects on optical wireless ... 0.01 W, the performances of all SCFDE schemes are almost the same due to their lower PAPR For an input signal power of W for QPSK and 0.1 W for 16 QAM and 64 QAM, DQO-SCFDE performs better than...
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Báo cáo sinh học: " Research Article Iterative Frequency-Domain Channel Estimation and Equalization for Ultra-Wideband Systems with Short Cyclic Prefix" pot
... Receiver performance over different channel models, for CP = and channel estimation with pilot blocks when the channel estimation is performed with the IBI cancellation, the reduction in IBI for CP ... the synchronization errors, channel estimation errors , and as well as the derivation of analytical performance bounds for the channel estimation and equalization with IBI cancellation 8 EURASIP ... 2: Performance of FD channel estimation with and without IBI cancellation, number of pulse repetition = block size = 160 symbols (640 chips), max CM4 UWB channel, channel length = 360, and taps...
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Báo cáo sinh học: " Research Article Time-Frequency Based Channel Estimation for High-Mobility OFDM Systems—Part II: Cooperative Relaying Case" pptx
... timevarying CO -OFDM channels (S → R), (R → D) as well as the cascaded (S → R → D) channels We approach the channel estimation problem from a time-frequency point of view and employ the channel estimation ... almost the same estimation performance for −40 and 40 dB and obtain better results for GSR /GRD = dB as in the individual channel estimation case We show the BER performance for GSR /GRD = {−40, ... cascaded channels may be calculated by means of the DET of the received signal We consider two channel estimation approaches for the CO -OFDM system illustrated in Figure 3.1 Individual Channel Estimation...
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Báo cáo hóa học: " Research Article Time and Frequency Synchronisation in 4G OFDM Systems" pdf
... proposal for 4G system developed in the WINNER project have been introduced A new time metric and pilot symbol design for coarse timing synchronisation, as well as new carrier and sampling frequency ... algorithms during simulations are shown in Table The algorithms for the carrier frequency and sampling frequency offsets estimation and tracking were tested for frequency offsets of δ f = 0.01 and δ f ... pattern is shown in Figure Generated OFDM symbols are 3.1 Coarse Timing Synchronisation Downlink timing synchronisation should be performed during the Downlink Synch slot of the WINNER MAC superframe...
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Báo cáo hóa học: " Research Article Opportunistic Scheduling for OFDM Systems with Fairness Constraints" docx
... will study scheduling problems under three fairness criteria for multiuser OFDM systems temporal fairness, utilitarian fairness, and minimum-performance guarantees These categories of fairness ... derive optimal policies for three categories of scheduling problems, each with a unique QoS /fairness requirement OPPORTUNISTIC SCHEDULING UNDER VARIOUS FAIRNESS CONSTRAINTS Good scheduling schemes ... downlink of an OFDM system We derive our opportunistic scheduling policies under three long-term QoS /fairness constraints—temporal fairness, utilitarian fairness, and minimum-performance guarantees,...
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Báo cáo hóa học: " Research Article Opportunistic Scheduling for OFDM Systems with Fairness Constraints" pdf
... will study scheduling problems under three fairness criteria for multiuser OFDM systems temporal fairness, utilitarian fairness, and minimum-performance guarantees These categories of fairness ... derive optimal policies for three categories of scheduling problems, each with a unique QoS /fairness requirement OPPORTUNISTIC SCHEDULING UNDER VARIOUS FAIRNESS CONSTRAINTS Good scheduling schemes ... downlink of an OFDM system We derive our opportunistic scheduling policies under three long-term QoS /fairness constraints—temporal fairness, utilitarian fairness, and minimum-performance guarantees,...
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Báo cáo hóa học: " Research Article A Time-Domain Fingerprint for BOC(m, n) Signals" doc
... timefrequency/scale analysis has also appeared as a textbook Currently, he works as an Associate Professor in mathematics and signal processing at The Netherlands Defense Academy, Den Helder, The Netherlands ... the signals In practice, this means that the method also can be applied to noisy signals with reasonable SNR values Moreover, also the type of BOC(m, n) plays a role in accurate classification in ... that every single case can be regarded as a special case of the latter case in which < gcd(2m, n) < n Therefore, the run length statistics for arbitrary BOC(m, n) read as in Table 106 105 104 103...
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Báo cáo hóa học: " Research Article Channel Impulse Response Length and Noise Variance Estimation for OFDM Systems with Adaptive Guard Interval" docx
... information of CIR length for both the receiver and the transmitter to adjust the GI length adaptively Moreover, the estimated noise variance can be used for generation of the channel state information ... proposed OFDM system as in a conventional OFDM system To implement the adaptive GI length concept for broadcasting OFDM systems, a feedback channel is required for signaling the CIR length information ... system with adaptive guard interval (illustration in baseband) STRUCTURE OF AN OFDM SYSTEM WITH ADAPTIVE GUARD INTERVAL Figure shows the structure of an OFDM system with adaptive guard interval, where...
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TIME DOMAIN MEDIUM ACCESS CONTROL PROTOCOLS FOR UNDERWATER ACOUSTIC NETWORKS
... is an investigation of time domain medium access control (MAC) protocols, specifically those based on Medium Access Collision Avoidance (MACA), for Underwater Acoustic Networks (UAN) A review ... ii TIME DOMAIN MEDIUM ACCESS CONTROL PROTOCOLS FOR UNDERWATER ACOUSTIC NETWORKS SHIRAZ SHAHABUDEEN (B.Eng., NUS, M.Tele.Eng., University of Melbourne) A THESIS SUBMITTED FOR THE DEGREE ... MAC for UANs have been actively researched for many years This thesis presents novel research findings on time- domain and MACA-based (Medium Access with Collision Avoidance) MAC protocols for...
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Time domain equalization for underwater acoustic OFDM systems with insufficient cyclic prefix
... alternative to time domain equalizers is their frequency domain counterparts Frequency domain equalizer for OFDM with insufficient CP are covered in [26; 27; 28] Among the frequency domain equalizers ... reflection point for the signal induced by the surface waves [31] Figure 2.1: Cyclic Prefix inserted at the front of an OFDM symbol in time domain Figure 2.1 shows an OFDM symbol with CP The CP ... three plots, the BER performances of the OFDM with sufficient CP are included for comparison The UTC equalizer with shorter CP performs almost as good as OFDM symbol with sufficiently long CP...
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