sounding channel estimation and control signaling errors
Báo cáo sinh học: " Research Article Iterative Frequency-Domain Channel Estimation and Equalization for Ultra-Wideband Systems with Short Cyclic Prefix" pot
Ngày tải lên :
21/06/2014, 16:20
... uncertainties such as 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 ... 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 SNR = 20 dB All channel ... 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 of 0, 10, and 20 symbol...
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Báo cáo hóa học: "Research Article A Novel Quantize-and-Forward Cooperative System: Channel Estimation and M-PSK Detection Performance" potx
Ngày tải lên :
21/06/2014, 17:20
... FER performance due to channel estimation errors (especially the estimation of the source-relay channel coefficient, where only pilot symbols are used) and the smaller Es and Er from (2), because ... destination with the true channel parameters replaced by estimates The channel gains h0 and h2 and noise variances N0 and N2 are estimated at the destination, while estimates of h1 and N1 , computed ... sent by the source and relay, denoted Es and Er , respectively Taking into account the transmission of pilot symbols and the instantaneous SNR on the source-relay channel, Es and Er can be expressed...
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Báo cáo hóa học: "Research Article Linearly Time-Varying Channel Estimation and Symbol Detection for OFDMA Uplink Using " potx
Ngày tải lên :
21/06/2014, 23:20
... time- and frequency-selective channel can be modeled as Fourier basis expansions Thereafter, this model was intensively investigated and applied in block transmission, channel estimation, and equalization ... where channel estimation can only be performed within each subband of individual user, separately Channel Estimation Analysis In this section, we analyze the performance of the proposed channel ... MSE of the ith OFDMA symbol 6.1 Channel Estimation We firstly examine the ST-based weighted channel estimation scheme under different IPR to verify the channel estimation variance analysis in Figure...
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Báo cáo hóa học: " Multipass Channel Estimation and Joint Multiuser Detection and Equalization for MIMO Long-Code DS/CDMA Systems" potx
Ngày tải lên :
22/06/2014, 22:20
... problem of channel estimation for multiantenna DS/CDMA systems employing long codes The contributions of this paper can be summarized as follows (i) We extend the iterative channel estimation and data ... bits are randomly generated and used to generate the discrete-time vectors r(1), , r(B); then, random errors with probability p(e) are introduced on the Nt (B − T) information bits and, after ... transmitted packet is known and exploited for channel estimation 5.2 Numerical bit error rate results The results of Figure have shown that the performance of the channel estimation scheme can have...
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Báo cáo hóa học: " Channel Estimation and Data Detection for MIMO Systems under Spatially and Temporally Colored Interference" potx
Ngày tải lên :
23/06/2014, 01:20
... estimated channel and correlation of I + N One interferer, estimated channel and assumed white I + N Two interferers, estimated channel and correlation of I + N Two interferers, estimated channel and ... in channel estimation and data detection (a) perfectly known channel parameters and interference statistics, with one-vector-symbol (curve 1) and twovector-symbol (curve 2) detection; (b) channel ... consider the case of one interferer and large SNR and assess the benefits of taking temporal and/ or spatial interference correlation into account for channel estimation and data detection We then examine...
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estimation and control over networks using event-based transmission methods
Ngày tải lên :
13/11/2014, 05:59
... performance of the standard controller 44 4.2 Control performance of the proposed controller 44 4.3 Control performance of the multirate controller ... system and only one controller/estimator node is connected to the network All sensor nodes are connected to the controller/estimator node by a serial network for state estimation and control ... to the controller node with the event-based method, and the controller node send data to the actuator node periodically We prove the stability of the proposed controller and show that control...
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Estimation and control of contaminant transport in water reservoirs
Ngày tải lên :
09/09/2015, 10:06
... guidance, understanding and support I will never forget Her wisdom, knowledge and commitment to the highest standards inspired and motivated me Her excellent guidance, discussions and patience helped ... problems, constantly and patiently guided and corrected my writing and financially supported my research I would also like to express my appreciation and thank for his kind helps and support for the ... reduced-order models 82 5.3 Optimal control of reduced model 83 5.4 Relative error between full control and reduced control solutions and speedup factor of full model vs reduced...
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Channel estimation and synchronization for OFDM and OFDMA systems
Ngày tải lên :
12/09/2015, 09:39
... time-invariant and time-variant channel conditions In the second part of this thesis, we propose an efficient channel estimation and phase error suppression technique for multi-band OFDM based ultra-wideband ... constellation knowledge This requires channel estimation and tracking, and it is usually done in frequency-domain, i.e., by estimating the channel frequency response (CFR)3 Channel estimators developed ... and is advantageous in optimizing system resource allocation [10,116] However, estimation and compensation of multiuser CFO’s and timing errors are more challenging in GCAS than that in subband-based...
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Slip modelling, estimation and control of omnidirectional wheeled mobile robots with powered caster wheels
Ngày tải lên :
14/09/2015, 08:43
... position control and constraint force control of the system and thus provides the flexibility of constraint force control for the purpose of slip reduction Optimization methods for traction control and ... manipulators 2.3 Slip and Friction Estimation Control of vehicle friction is quite complex and requires reliable models and estimators of friction characteristics Reliable and accurate information ... Practical slip detection and estimation schemes for wheeled mobile robots • General slip control structure for wheeled mobile robots • Robust and real time slip control techniques • Control of wheeled...
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Channel estimation and detection for multi input multi output (MIMO) systems
Ngày tải lên :
03/10/2015, 11:37
... 33 Channel Estimation and Detection for MIMO systems 4.1 Decouple Maximum Likelihood (DEML) 4.2 Channel estimation and Detection for quasi-static flat fading 34 34 channels ... the channel On the other hand, if the channel possesses a constant gain and linear phase response over a bandwidth that is smaller than the bandwidth of the transmitted signal, then the channel ... 40 4.3.2 Channel estimation 44 4.3.3 Symbol Detection 44 Channel estimation and detection for flat fast fading channels 46 4.4.1 Sytem...
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Joint channel estimation and OFDM synchronization in multipath fading
Ngày tải lên :
08/11/2015, 17:17
... problem of joint channel estimation and timing synchronization and carrier frequency offset estimation A review of the available techniques follow and an account of the thesis outline and contribution ... selective channels are also known as wideband channels since the signal bandwidth is wider than the bandwidth of the channel impulse response As time varies, 19 CHAPTER SIGNAL MODEL the channel ... Mean and Variance of Channel Estimation Error 44 Simulation Results and Discussions 46 4.5.1 Performance in AWGN Channel 46 4.5.2 Performance in Multipath Fading Channel...
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Báo cáo hóa học: " Research Article Bit Error Rate Approximation of MIMO-OFDM Systems with Carrier Frequency Offset and Channel Estimation Errors" ppt
Ngày tải lên :
21/06/2014, 11:20
... BERs of QPSK and 16QAM with different combining methods Figures and consider SISO-OFDM The BER is degraded due to the frequency offset and channel estimation errors For a fixed channel estimation ... Communications and Networking x1 CP IFFT Nr H11 P/S y1 r11 IAI cancellation e j2π( fc +ε11 ·Δ f )t CFO estimation IAI cancellation rNr Channel CFO estimation estimation Channel estimation ... to the frequency offset and channel estimation errors is analyzed in Section The BER, taking into consideration both the frequency offset and channel estimation errors, is derived in Section The...
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A Study of Channel Estimation for OFDM Systems and System Capacity for MIMO-OFDM Systems
Ngày tải lên :
20/11/2012, 11:28
... LMMSE channel estimation with matched SNR and LMMSE channel estimation with designed SNRs 85 Fig 3.10: BER comparison between the proposed fast LMMSE channel estimation with estimated SNR and ... new pilot pattern and corresponding channel estimation method and data detection for OFDM systems over fast fading channels have been proposed The proposed channel estimation and data detection ... first issue, that is, channel estimation The proposed channel estimation method in Chapter is based on quasi-static fading channels and that in Chapter is based on fast fading channels Then, the...
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Báo cáo hóa học: " Preamble and pilot symbol design for channel estimation in OFDM systems with null subcarriers" pdf
Ngày tải lên :
21/06/2014, 03:20
... and pilot symbols for channel estimation We consider point-to-point wireless OFDM transmissions over frequency-selective fading channels We assume that the discrete-time baseband equivalent channel ... all active subcarriers in order to make precise frequency offset estimation and channel estimation possible [18] For channel estimation, we place Np (≤ |K|) pilot {p1 , , pNp } at subcarriers ... be utilized for channel estimation so that we have Np = |K| On the other hand, in a pilot-assisted OFDM symbol, we have to select pilot subcarriers and allocate power to pilot and data subcarriers...
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Báo cáo hóa học: "Research Article Comparison of Channel Estimation Protocols for Coherent AF Relaying Networks in the Presence of Additive Noise and LO Phase Noise Stefan Berger and Armin Wittneben" pptx
Ngày tải lên :
21/06/2014, 17:20
... mixing from baseband to passband and with negative sign when mixing from passband to baseband (e.g., [23]) Consequently, the equivalent complex baseband-to-baseband channels from A to B and from B ... equivalent two-hop channel coefficients are derived for four different channel estimation protocols They differ in the direction in which the singlehop channels hSk Rl and hRl Dm are measured and can be ... Direction of measurement and required number of channel uses to estimate all first-hop and second-hop channel coefficients First-hop channel Protocol A1 Protocol A2 Protocol B1 The channel coefficients...
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Báo cáo hóa học: " Research Article Turbo Processing for Joint Channel Estimation, Synchronization, and Decoding in Coded MIMO-OFDM Systems" pdf
Ngày tải lên :
21/06/2014, 23:20
... of CFO, SFO and channel distortions was examined and explored to develop a turbo joint channel estimation, synchronization, and decoding scheme and a vector RLS-based joint CFO, SFO, and CIR tracking ... CFO, SFO, and CIR play an important role in the convergence of the joint synchronization, channel estimation, and decoding turbo processing, we also develop a coarse CFO, SFO, and CIR estimation ... SFO, and channel responses on the received samples These interrelations are further explored to develop the turbo joint channel estimation, synchronization, and decoding scheme in Section 4, and...
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Báo cáo hóa học: " Research Article A Low-Complexity LMMSE Channel Estimation Method for OFDM-Based Cooperative Diversity Systems with Multiple Amplify-and-Forward Relays" docx
Ngày tải lên :
22/06/2014, 00:20
... next section LOW-COMPLEXITY LMMSE CHANNEL ESTIMATION METHOD 3.1 LMMSE channel estimation method This subsection proposes a training-based method for channel estimation of multiple AF-relays-assisted ... simplest algorithm for the channel estimation using (7) is the LS estimator, which does not exploit a priori knowledge of channel statistics and noise power and has worse estimation performance relative ... perform MMSE channel estimation for the AF channel because the total channel h is non-Gaussian Therefore, we focus our attention on the suboptimal LMMSE channel estimator The analysis and simulation...
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Báo cáo hóa học: " Research Article An ML-Based Estimate and the Cramer-Rao Bound for Data-Aided Channel Estimation in KSP-OFDM" pdf
Ngày tải lên :
22/06/2014, 19:20
... (c) Channel estimation Figure 1: Time-domain signal of KSP-OFDM: (a) transmitted signal, (b) received signal and observation interval for data detection, and (c) observation interval for channel ... guard interval and the carriers, and the data symbols interfere with the guard interval carriers Therefore, channel estimation in KSP-OFDM is in general more complex than for CP-OFDM and ZP-OFDM ... [9] H L Van Trees, Detection, Estimation and Modulation Theory, John Wiley & Sons, New York, NY, USA, 1968 [10] F Tufvesson and T Maseng, “Pilot assisted channel estimation for OFDM in mobile...
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Báo cáo hóa học: " Research Article Distributed Space-Time Block Coded Transmission with Imperfect Channel Estimation: Achievable Rate and Power Allocation" pot
Ngày tải lên :
22/06/2014, 19:20
... channel with two receive antennas, versus the channel estimation error variance of the first subchannel, that is, σ1 , at SNR = 20 dB The channel estimation error 2 variance of the second subchannel ... of noise samples, T x = [ x1 x2 ] , and the effective channel estimation and error matrices are given by ⎛ h11 H eff h12 ⎞ ⎛ (3) Note that the effective channel estimation is an orthogonal matrix ... In Section 2, the system and channel models are introduced Lower and upper bounds on the mutual information under channel estimation error for D-STBCs in Rayleigh fading channels are derived in...
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Báo cáo hóa học: "Motion Estimation and Signaling Techniques for 2D+t Scalable Video Coding" doc
Ngày tải lên :
22/06/2014, 23:20
... the memory bandwidth and the computational complexity according to the complete-to-overcomplete (CODWT) algorithm described in [20] 2.1 Fast in-band motion estimation The wavelet in-band prediction ... [1] D Taubam and M W Marcellin, JPEG2000: Image Compression Fundamentals, Standards and Practice, Kluwer Academic, Boston, Mass, USA, 2002 [2] A Said and W A Pearlman, “A new, fast, and efficient ... a fast motion estimation algorithm that is meant to work in the wavelet domain (FIBME—fast in-band motion estimation) , exploiting the geometrical properties of the wavelet subbands Section 2.1...
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