... 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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... 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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... 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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... 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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... 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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... 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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... 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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... 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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... 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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... 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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... 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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... 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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... ** 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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... 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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... 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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Từ khóa:
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