Channel estimation for LTE uplink in high doppler spread WCNC2008

Báo cáo hóa học: " Research Article An Adaptive Channel Interpolator Based on Kalman Filter for LTE Uplink in High Doppler Spread Environments" docx

Báo cáo hóa học:
... timevarying channels in high speed environments The variations of channel taps are tracked jointly by Kalman filter in time domain during training symbols Since channel tap information is missing between ... channel estimation algorithm based on Kalman filter and a polynomial curve fitting interpolator whose order is selected adaptively is proposed for LTE uplink systems which include timevarying channels ... allocation scheme in order to track the time-variations of the channel In [8] Modified Kalman filter- (MKF-) based time-domain channel estimation approach for OFDM with fast fading channels has been investigated...
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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

Báo cáo sinh học:
... 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 Turbo Processing for Joint Channel Estimation, Synchronization, and Decoding in Coded MIMO-OFDM Systems" pdf

Báo cáo hóa học:
... 21, 24] In this paper, we propose a joint synchronization, channel estimation, and decoding turbo processing scheme for coded MIMO-OFDM systems in the presence of quasistatic multipath channels, ... These interrelations are further explored to develop the turbo joint channel estimation, synchronization, and decoding scheme in Section 4, and the vector RLS-based joint CIR, CFO, and SFO tracking ... mapper P(d; I) Figure 3: Turbo processing for joint channel estimation, synchronization, and decoding is in general not significant However, due to its randomness, using a random matrix may give...
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Báo cáo hóa học: " Maximum Likelihood Turbo Iterative Channel Estimation for Space-Time Coded Systems and Its Application to Radio Transmission in Subway Tunnels" potx

Báo cáo hóa học:
... bits), LS (M = 26 bits), and known channel Turbo ST receivers We formulate the ML estimation problem that takes into account the deterministic symbols corresponding to the training sequence and ... our channel estimation technique enables us to diminish the training sequence length up to only bits, instead of the 26 bits considered in the GSM standard, thus achieving a 14% increase in the ... results obtained with the proposed estimator using a training sequence of M = bits and those obtained with classical LS using a training sequence of M = 26 bits (the length standardized in GSM) The...
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A Study of Channel Estimation for OFDM Systems and System Capacity for MIMO-OFDM Systems

A Study of Channel Estimation for OFDM Systems and System Capacity for MIMO-OFDM Systems
... that is system capacity In Chapter 5, the MIMO -OFDM system capacity with imperfect feedback channel is investigated In Chapter 6, the capacity variances for OFDM systems over Rayleigh and Ricean ... 6) Chapter 2: OFDM systems and MIMO systems Since the thesis studies the channel estimation for OFDM systems and system capacity for MIMO -OFDM systems, this chapter briefly introduces the background ... for OFDM systems 21 2.2.2 Peak-to-Average (PAR) of OFDM systems 30 2.2.3 Channel estimation for OFDM systems 33 2.2.4 Synchronization of OFDM systems 38 2.2.5 Advantages...
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Warm up activities for speaking class in high school

Warm up activities for speaking class in high school
... 1.3.2 Teaching aims of using warm- up activities 17 1.3.3 The role of warm- up activities in speaking class 20 1.3.4 Principles of using warm- up activities in speaking class in high school 22 ... analyzing the situation of teaching and learning speaking skills and using warm - up activities in speaking class in high in school - Synthesizing and analyzing the results gained in investigating ... saying what it is 1.3.3 Principles of using warm up activities in speaking class in high school As mentioned above, we can not deny the necessity of using warm- up activity in speaking class in...
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Báo cáo hóa học: " Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications" pptx

Báo cáo hóa học:
... al, MultiBand OFDM Physical Layer Proposal for IEEE802.15.3a MultiBand OFDM Alliance SIG (2004) A Batra, J Balakrishnan, GR Aiello, JR Foerster, A Dabak, Design of a multiband OFDM system for ... WF performance Conclusion In this paper, an adaptive FIC RR-WF channel estimation algorithm is proposed for the MB -OFDM UWB communication systems This RR-WF-based algorithm employs an adaptive ... http://asp.eurasipjournals.com/content/2011/1/64 In this paper, an adaptive low-rank channel estimation scheme based on the Wiener filtering (WF) technique is proposed for MB -OFDM UWB communication systems This reduced-rank...
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báo cáo hóa học: " Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications" docx

báo cáo hóa học:
... al, MultiBand OFDM Physical Layer Proposal for IEEE802.15.3a MultiBand OFDM Alliance SIG (2004) A Batra, J Balakrishnan, GR Aiello, JR Foerster, A Dabak, Design of a multiband OFDM system for ... WF performance Conclusion In this paper, an adaptive FIC RR-WF channel estimation algorithm is proposed for the MB -OFDM UWB communication systems This RR-WF-based algorithm employs an adaptive ... http://asp.eurasipjournals.com/content/2011/1/64 In this paper, an adaptive low-rank channel estimation scheme based on the Wiener filtering (WF) technique is proposed for MB -OFDM UWB communication systems This reduced-rank...
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Báo cáo hóa học: " Research Article Channel Estimation for Two-Way Relay OFDM Networks" pot

Báo cáo hóa học:
... to develop their corresponding channel estimation algorithms for OFDM modulated TWRN in [22] In this work, we consider the channel estimation for twoway relay OFDM networks Due to the nature ... expectation operation Two-Way Relay OFDM Model Consider a two-way relay network where the two source nodes, Tx1 and Tx2, exchange information relying on the help of a relay node R The relay node and ... sequences We compare both MSE performance as well as symbol error rate (SER) performance for two-way relay OFDM networks Figure shows the MSE performance between θ and θ for different training sequences...
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Báo cáo hóa học: " Research Article Degenerated-Inverse-Matrix-Based Channel Estimation for OFDM Systems" pdf

Báo cáo hóa học:
... pilot-aided channel estimation methods for OFDM systems,” IEEE Transactions on Signal Processing, vol 49, no 12, pp 3065–3073, 2001 [5] G Auer, A Dammann, and S Sand, Channel estimation for OFDM systems ... 1) Figure 5: NMSE performance with σ/T = 0.123 and fd T =0.0075 Figure 7: BER performance with 64-QAM -OFDM We can see that the DIME achieved a good performance for 16-QAM -OFDM, degradation within ... averaging in the frequency domain, employed for ZF-FAV, had a certain effect on 16-QAM -OFDM but had no effect on 64-QAM -OFDM For 16-QAM -OFDM the performance gain of the DIME relative to ZF-FAV...
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Báo cáo hóa học: " Joint Downlink Power Control and Multicode Receivers for Downlink Transmissions in High Speed UMTS" pot

Báo cáo hóa học:
... iteratively in the algorithm described in the next section COMBINED DOWNLINK POWER CONTROL AND JOINT MULTICODE RECEIVERS In this section, we propose to combine the downlink power control and the joint multicode ... the downlink power control such as [17–19] In [17], the authors studied the joint optimal power control and beamforming in wireless networks In [18], the authors studied the downlink power control ... proposed strategy of joint downlink power control and multicode receivers outperforms the conventional downlink power control in terms of total transmitted power of the multicode user In all simulations,...
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Báo cáo hóa học: " Time of Arrival Estimation for UWB Localizers in Realistic Environments" pot

Báo cáo hóa học:
... Methods for calibration and mitigation of NLOS ranging errors are analyzed in [21, 22] and, in the specific UWB range estimation context, in [23] An algorithm for ranging estimation in the case of ... correlators is interesting for investigating the realization of a UWB selective Rake receiver However, when the goal is the estimation of the ToA of the direct path, a better result for the channel estimation ... number of paths in the 49 points of the grid in rooms H and B (crosses) and mean of the ToA estimation error (line) Search and subtract agorithm was used (ii) As the number of considered paths increases,...
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Báo cáo hóa học: " Blind Channel Estimation for Space-Time Coded WCDMA Youngchul Sung" potx

Báo cáo hóa học:
... Blind Channel Estimation for Space-Time Coded WCDMA channel estimation in such a wideband system is twofold First, the WCDMA is a multirate system where the ... Fortunately, WCDMA also offers signal structures that could be exploited in an estimation scheme Blind estimation or detection algorithms have been proposed for space-time coded CDMA systems For ... noise Blind Channel Estimation for Space-Time Coded WCDMA s d1 d2 L2 G1 325 requirement by exploiting the structure of the code matrix [17] The output of the decorrelator is given in vector form...
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Báo cáo hóa học: " Rotated Walsh-Hadamard Spreading with Robust Channel Estimation for a Coded MC-CDMA System" ppt

Báo cáo hóa học:
... codes with dH = 3, 4, The rate is 3/4 Robust channel estimation is performed for 4-QAM modulated data symbols channel estimation can maintain the performance gains based on rotated spreading ... the AWGN channel bound for a Rayleigh fading channel It does not perform worse without rotated modulation in case of an AWGN channel Latter is identified as an important fact that no degradation ... combination of rotating and multiplying each data symbol with a specific WalshHadamard sequence is defined as rotated spreading It is like column rotation of the original Walsh-Hadamard spreading matrix by...
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Báo cáo khoa học: " Comparison of T2 and FLAIR imaging for target delineation in high grade gliomas" pptx

Báo cáo khoa học:
... date and T1 MRI obtained at time of failure The failure volume (rGTV) is contoured in light green The T2 and FLAIR CTVs are outlined in red and cyan respectively The T2 and FLAIR PTVs are outlined ... doi:10.1186/1748-717X-5-5 Cite this article as: Stall et al.: Comparison of T2 and FLAIR imaging for target delineation in high grade gliomas Radiation Oncology 2010 5:5 ... with the PTV as defined by T2 and FLAIR was recorded For comparison purposes, the tumor volumes were evaluated in pairs (e.g CTV as delineated on T2 and FLAIR) Each pair of target volumes was...
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