preamble and pilot symbols for channel estimation

... choice for the doubly selective channel 3.3 Problem formulation Next we apply CE-BEM (7) and (8) into (4) for channel estimation and data detection Our tasks are (i) estimate the parameters hqand ... selective channel estimation for amplify-and-forward relay networks Gongpu Wang1,2*, Feifei Gao3, Rongtao Xu2and Chintha Tellambura4 Abstract In this article, doubly selective channel estimation ... contains N k symbols of which N s k symbols are data and are represented by sk , while N b k symbols are pilots and are represented by bk The total number of data sym-bols is N s = P k=1N s k and the

Ngày tải lên: 02/11/2022, 09:21

... doses (for general joint and skeletal health, for pain from arthritis, and for spasticity), and three types of activities suggested by her former therapist (walking/cycling, hand operation, and ... mass and concentration in the gut are m 1 and C 1 and in the blood are m 2 and C 2 , the dif-fusion constant between the gut and blood is K , and the constants of M-M kinetics are V max and ... intended for a PDA that can specify inputs, receive outputs, and can obtain current state and output information and summary predictive information A given user may participate in (and thus have

Ngày tải lên: 19/06/2014, 10:20

... enhance the system performance, pilot-assisted channel estimation schemes are commonly employed for the MB-OFDM UWB systems In particu-lar, the performance of channel estimation in a pilot-aided MB-OFDM ... nature of both channels CM2 and CM3, the MSE and the BER performances degrade slightly as compared with that of the channel CM1 The MSE and the BER performances of those different channel estimation ... A R C H Open AccessAdaptive low-rank channel estimation for multi-band OFDM ultra-widemulti-band communications Abstract In this paper, an adaptive channel estimation scheme based on the reduced-rank

Ngày tải lên: 20/06/2014, 22:20

... interventions and selected smallholders for training and demonstration units and estimation of potential physical and financial impacts 1) High priority project interventions include (and corresponding ... service o Number born, and date o Number scouring, (duration of treatment, and a record of any samples collected for NIVR) o Age and speculative cause of death o Number weaned and date o Date of ... allowing for adequate cross ventilation and the ridge vent allowing hot air to rise and escape The piggery is made from cheap, cost effective materials Trang 142) Estimation of potential physical and

Ngày tải lên: 21/06/2014, 06:20

... Article Joint Linear Processing for an Amplify-and-Forward MIMO Relay Channel with Imperfect Channel State Information Batu K Chalise1and Luc Vandendorpe2 1 Center for Advanced Communications, Villanova ... nonconvex even for the case without channel estimation for the MSE for each data stream Unfortunately, this is not the case for the proposed robust design due to the fact that the termse, f , and d are ... whereBi,iandCi,iare theith diagonal elements ofB and C, respectively, andp =min(NT,NR,M, NS) SinceB and C are positive semidefinite, we haveBi,i ≥0 andCi,i ≥0 for alli. Using (47) and (49),

Ngày tải lên: 21/06/2014, 08:20

... BERs of QPSK and 16QAM with different combining methods Figures4and5consider SISO-OFDM The BER is degraded due to the frequency offset and channel estimation errors For a fixed channel estimation ... analysis exploits the fact that for unbiased estimators, both channel and frequency offset estimation errors are zero-mean random variables (RVs) Note that the exact channel estimation algorithm design ... focus of this paper, and the main parameter of interest is the channel estimation error Many channel estimation algorithms developed for either SISO or MIMO-OFDM systems, for example, [20–22],

Ngày tải lên: 21/06/2014, 11:20

... stream period-ically and channel estimation is performed by interpolating them Various pilot-symbol-aided channel estimation schemes have been investigated for OFDM [2 4] and multiinput-multioutput ... of pilot-aided channel estimation methods for OFDM systems,” IEEE Trans-actions on Signal Processing, vol 49, no 12, pp 3065–3073, 2001 [5] G Auer, A Dammann, and S Sand, “Channel estimation for ... given as hm = hp1 hp0 wherehp0 andhp1are the estimated CTFs of pilot symbols for a subcarrier that has sandwiched data symbols Since the noise is included in hp0 andhp1 and can be assumed to be independent,

Ngày tải lên: 21/06/2014, 20:20

... and 350 labels for p and q, respectively The number of labels for both the tilt and slant angles of the light source position were chosen as 40 The regularization parametersλ p andλ q for p and ... used 440 and 420 labels forp and q, respectively The other parameters λ tand T t, wheret = p, q, as well as the number of labels for tilt and slant angles of the light source position and the ... approach for simultaneous estimation of scene structure, light source direction, and blind image restoration We present the results of experimentation for light source direction estimation, depth estimation,

Ngày tải lên: 21/06/2014, 22:20

... into digital form for further handling and storage, also the data communication with an external motion estimation core should be digital This enables high-speed I/O operations and makes a separate ... before motion estimation, considerable power savings could be achieved and the processing could be performed for the whole frame in a fully parallel manner In reality this is not feasible for a megapixel ... Interconnect-Efficient Reference Data Shift and SAD/SSD Extraction for Motion Estimation Jonne Poikonen,1Mika Laiho,1Ari Paasio,1Lauri Koskinen,2and Kari Halonen2 1 Department of Information Technology, University

Ngày tải lên: 21/06/2014, 22:20

... perform channel estimation As shown inFigure 2, the channel estimator firstly performs channel frequency response estimation at pilot subcarriers There are some channel estimation methods for ... Interoperability for Microwave Access (WIMAX) system adopt pilot assisted channel estimation, so this paper studies the first kind For the pilot-aided channel estimation methods, there are two classical pilot ... present channel estimation methods generally can be divided into two kinds One kind is based on the pilots [6 9], and the other is blind channel estimation [10–12] which does not use pilots Blind channel

Ngày tải lên: 21/06/2014, 22:20

... Communications and NetworkingVolume 2008, Article ID 892193, 13 pages doi:10.1155/2008/892193 Research Article Reduced-Rank Shift-Invariant Technique and Its Application for Synchronization and Channel ... reduced-rank shift-invariant technique and its application for synchronization and channel identification in UWB systems Shift-invariant techniques, such as ESPRIT and the matrix pencil method, have ... algorithms for joint synchronization and channel estimation in UWB systems, where general correlator-based algorithms confront many limitations Technical details, including sampling and the capture

Ngày tải lên: 21/06/2014, 23:20

... with the AF protocol) and use the knowledge of the SNRs of the for-ward and backfor-ward channels in order for the relay to op-timally adapt to the forward and backward channel condi-tions To ... amplify-and-forward with MRC Amplify-and-forward SIMO bound SNR rd= 0 (dB) SNR rd= 10 (dB) SNR rd= 40 (dB) Figure 5: Comparison between the AF and clipped AF protocols in quasistatic channels for ... pro-tocol and the recombination scheme at the destination So far, three main types of relaying protocols have been con-sidered in the literature: amplify-and-forward (AF), decode-and-forward (DF), and

Ngày tải lên: 22/06/2014, 00:20

... can calculate wnusing (15) and update Anusing (18) On the other hand, if there is no close form solution for e nor the solution is very complicated, then we can use (21) and (22) 2.3 Specific algorithms ... algorithms based on the Bayesian formulation of the problem The basic idea is that in each step we use a Gaussian approximation for the posterior and a quadratic approximation for the log-likelihood function ... discussed, in this paper, for brevity purpose, we have omitted the presentation of an extensive literature survey Interested readers can refer to [19] and references therein for more information The rest

Ngày tải lên: 22/06/2014, 01:20

... 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 ... the pilot symbols to improve the MSE and BER performances It is also verified that, the conventional preamble of IEEE 802.11a is comparable to the optimally designed preamble II Preamble and pilot ... to make precise frequency offset estimation and channel estimation possible [18] For channel estimation, we place Np (≤ |K|) pilot {p1 , , pNp } at subcarriers symbols k1 , k2 , , kNp ∈ K(k1

Ngày tải lên: 21/06/2014, 03:20

... wavelet denoising 5.8 MSE performance for channel estimation based different interpolation 114 technique using MMSE for pilot estimation 5.9 MSE performance for channel estimation based different ... techniques of pilot estimation with and without wavelet denoising 5.7 MSE performance for channel estimation based different interpolation 113 technique using LS technique for pilot estimation combined ... 5.1 Page Baseband model of the OFDM system based on pilot signal for channel 106 estimation 5.2 MMSE technique versus LS technique for pilot estimation in OFDM 107 signals 5.3 The performance comparison...

Ngày tải lên: 26/05/2013, 21:28

... three major channel estimation concepts in this context: (1) training-based channel estimation (tb), (2) semiblind channel estimation (sb), and (3) blind channel estimation For tb, channel estimation ... to MMSE channel estimation Numerical bit error results for frequency-flat and frequency-selective Rayleigh fading channels are depicted in Figure for tbMMSE-IC and in Figure for sb-MMSE and sw-sb-LS, ... semiblind channel estimation (the channel estimation is based on the training and the soft information about the estimated data from the previous iteration) always outperforms trainingbased channel estimation...

Ngày tải lên: 22/06/2014, 23:20

... are designed for the Decode and Forward (DF) protocol Channel parameter estimation is discussed in [9] for the AF protocol, where pilot- based estimates are calculated for the different channel coefficients ... the source and K p is the number of pilot symbols sent by both source and relay Similar equations are obtained for the estimation of h1 and N1 at the relay (based on the K p pilot symbols sent ... the worse 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),...

Ngày tải lên: 21/06/2014, 17:20

... 92 iv 4.3.2 Channel Estimation and data detection for the first M1 OFDM symbols of each block 94 4.3.3 Channel estimation and data detection for the last M2 OFDM symbols of each ... channel estimation for the first M1 OFDM symbols, for f d T = 0.01, 0.06 and 0.1, respectively 114 Fig 4.3: The NMSE of channel estimation based on equi-spaced and grouped pilot pattern, viii for ... (Chapter 3) A 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...

Ngày tải lên: 20/11/2012, 11:28

... 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 ... (35) 6.3 Channel Estimation Error: Equivalent Two-Hop Channels A sensible performance measure for the channel estimation schemes was found to be how well the anticipated equivalent two-hop channels ... defined in (8) for protocols A1 and B1, respectively The main results are (41) and (48) (1) Protocol A1: for channel estimation protocol A1, the estimates of the first-hop and second-hop channel coefficients...

Ngày tải lên: 21/06/2014, 17:20

... 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 ... the assumption of perfect channel estimation, decision-directed (DD) techniques were proposed for joint CFO/SFO estimation and tracking [21] and for phase noise and residual frequency offset compensation ... antennas, and Nd is the number of subcarriers used in each turbo iteration for the vector RLS tracking Coarse CIR, CFO, and SFO Estimation for Initial Values For a stationary environment and time-invariant...

Ngày tải lên: 21/06/2014, 23:20