... 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 preambleforchannelestimationandpilotsymbolsfor pilot- aided ... the pilotsymbols 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 Preambleandpilot ... to make precise frequency offset estimationandchannelestimation possible [18] Forchannel estimation, we place Np (≤ |K|) pilot {p1 , , pNp } at subcarriers symbols k1 , k2 , , kNp ∈ K(k1
... wavelet denoising 5.8 MSE performance forchannelestimation based different interpolation 114 technique using MMSE forpilotestimation 5.9 MSE performance forchannelestimation based different ... techniques of pilotestimation with and without wavelet denoising 5.7 MSE performance forchannelestimation based different interpolation 113 technique using LS technique forpilotestimation combined ... 5.1 Page Baseband model of the OFDM system based on pilot signal forchannel 106 estimation 5.2 MMSE technique versus LS technique forpilotestimation in OFDM 107 signals 5.3 The performance comparison...
... three major channelestimation concepts in this context: (1) training-based channelestimation (tb), (2) semiblind channelestimation (sb), and (3) blind channelestimationFor tb, channelestimation ... to MMSE channelestimation 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 channelestimation (the channelestimation is based on the training and the soft information about the estimated data from the previous iteration) always outperforms trainingbased channel estimation...
... 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 pilotsymbols 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 pilotsymbols sent ... the worse FER performance due to channelestimation errors (especially the estimation of the source-relay channel coefficient, where only pilotsymbols are used) and the smaller Es and Er from (2),...
... for the transmitter and ε = δ = ε for nature (cf [15, Example 8.5]) The n-Ary Symmetric Channel Consider the n-ary symmetric channel with symbol set {0, 1, , n − 1} andchannel matrix ⎛ ⎞ ε0 ... Press, London, UK, 1981 M Pinsker, Information and Information Stability of Random Variables and Processes, Holden-Day, San Francisco, Calif, USA, 1964 A W Roberts and D E Varberg, Convex Functions, ... Output Channels We first deal with discrete channels If the output set consists of n symbols {y1 , , yn }, then the behavior of the channel is completely characterized by the (m × n) channel...
... 92 iv 4.3.2 ChannelEstimationand data detection for the first M1 OFDM symbols of each block 94 4.3.3 Channelestimationand data detection for the last M2 OFDM symbols of each ... channelestimationfor the first M1 OFDM symbols, for f d T = 0.01, 0.06 and 0.1, respectively 114 Fig 4.3: The NMSE of channelestimation based on equi-spaced and grouped pilot pattern, viii for ... (Chapter 3) A new pilot pattern and corresponding channelestimation method and data detection for OFDM systems over fast fading channels have been proposed The proposed channelestimationand data detection...
... Est pilots CM1 CP = 2nd it IBI cancel Ch Est pilots Full CP Perf Ch AWGN Figure 3: Receiver performance over different channel models, for CP = andchannelestimation with pilot blocks when the channel ... cancel Ch Est pilots CM1 CP = 20 2nd it IBI cancel Ch Est pilots Full CP Perf Ch AWGN Figure 4: Receiver performance over different channel models, for CP = 20 andchannelestimation with pilot blocks ... Ch Est 10 pilots CM1 CP = 2nd it IBI cancel Ch Est 10 pilots Full CP Perf Ch AWGN Figure 5: Receiver performance over different channel models, for CP = andchannelestimation with 10 pilot blocks...
... 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 ChannelEstimation Error: Equivalent Two-Hop Channels A sensible performance measure for the channelestimation 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: forchannelestimation protocol A1, the estimates of the first-hop and second-hop channel coefficients...
... of CFO, SFO andchannel 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 estimationand tracking [21] andfor 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 Estimationfor Initial Values For a stationary environment and time-invariant...
... multiple OFDMA symbols We also present a performance analysis of the channelestimation approach and derive a closed-form expression for the channelestimation variances It is shown that the estimation ... where channelestimation can only be performed within each subband of individual user, separately ChannelEstimation Analysis In this section, we analyze the performance of the proposed channel ... the information sequence on the channelestimation at receiver In [24], an iterative approach is provided where the information sequence is exploited to enhance the channelestimation performance...
... worse estimation performance relative to the MMSE estimator However, it is intractable to perform MMSE channelestimationfor the AF channel because the total channel h is non-Gaussian Therefore, ... “A CSI estimation method for wireless relay network,” IEEE Communications Letters, vol 11, no 6, pp 480–482, 2007 [9] C S Patel and G L St¨ ber, Channelestimationfor amplify u and forward ... Kim, and H Park, “OFDM channelestimationfor the amply -and- forward cooperative channel, ” in Proceedings of the 65th IEEE Vehicular Technology Conference (VTC ’07), pp 1642–1646, Dublin, Ireland,...
... approximative analytical expression for the Gaussian Cramer-Rao bound (GCRB) forchannelestimation when the pilotsymbols are distributed over the guard interval andpilot carriers The paper is organized ... modulated by the pilotsymbolsand the data symbols, respectively, with I p ∪ Id = {0, , N − 1} Hence, the symbol vector a contains M − ν pilotsymbols bc and N + ν − M data symbols which are ... bound, related to for data-aided channelestimation in KSP-OFDM, when the pilotsymbols are distributed over the guard interval andpilot carriers An analytical expression for the GCRB is derived...
... transmitted packet is known and exploited forchannelestimation 5.2 Numerical bit error rate results The results of Figure have shown that the performance of the channelestimation scheme can have ... acquisition for wideband CDMA signals,” IEEE Journal on Selected Areas in Communications, vol 18, no 8, pp 1483–1494, 2000, Special issue on Wideband CDMA [8] S Buzzi and H V Poor, Channelestimationand ... illustrating some numerical results, we provide a theoretical analysis and derive an approximate closed-form formula for the channelestimation mean square error (CEMSE) at a given iteration of the...
... exploiting this idea For instance, G¨ rtz [11], Garciao Frias and Villasenor [12], and Guyader et al [13] worked on the problem of joint source -channel decoding and Zhang and Burr [14] addressed ... third-generation mobile standards consider the transmission of pilot sequences known by the receiver forchannelestimation purposes In the global system mobile (GSM) standard, this sequence is ... this paper, we present a novel channelestimation technique that gathers both the deterministic information corresponding to the pilot sequence and the statistical information, in terms of a posteriori...
... consider the case of one interferer and large SNR and assess the benefits of taking temporal and/ or spatial interference correlation into account forchannelestimationand data detection We then examine ... in channelestimationand data detection (a) perfectly known channel parameters and interference statistics, with one-vector-symbol (curve 1) and twovector-symbol (curve 2) detection; (b) channel ... frame length, and H (Nr × Nt ) and HI (Nr × L) are the channel matrices of the desired and interfering users, respectively The channel matrices are also assumed fixed over a frame and have independent...
... NMSE performance comparison of CMLE and IMLE 26 3.4 NMSE performance comparison for various channelestimation methods 29 3.5 FER performance comparison for various channelestimation ... forchannelestimation In this approach, the pilot signals in each OFDM symbol are mainly used for phase offset tracking and correction Channelestimation is done based on either block-type pilots ... (b) CM2, (c) CM3, and (d) CM4 (Sim, Ana, and PD are abbreviations for simulation, analytical and proposed, respectively.) 5.5 58 FER performance comparison for various channelestimation methods...
... re-modulation is robust to the channel order over -estimation, and the channelestimation identifiability is guaranteed for random channel realization Moreover, the method is applicable for MIMO OFDM systems ... the front, called the preamble The preamble is designed to provide information for a good packet detection, synchronization, as well as channelestimationChannelestimationfor the MIMO system ... estimation of channel taps at SNR= 12dB 67 4.4 Amplitude estimation of channel taps at SNR= 20 dB 68 4.5 Channelestimation MSEs versus SNR for different estimated channel order...
... the first M symbols of each block of N symbols are used forestimation of channel information, more explicitly, to estimate H and Σ 4.2.2 Channelestimation During the first M pilotsymbols of ... 33 ChannelEstimationand Detection for MIMO systems 4.1 Decouple Maximum Likelihood (DEML) 4.2 Channelestimationand Detection for quasi-static flat fading 34 34 channels ... selective FIR channel 21 29 30 4.1 4.2 4.3 Symbols structure for flat fading channels Symbols structure for frequency selective fading channels Symbols structure for fast...
... abbrs andsymbols .29 Table 5: The problems when using abbrs andsymbols .30 Table 6: The reasons for using abbrs andsymbols in note-taking .31 Table 7: Ways to create the abbrs andsymbols ... abbrs andsymbols .33 Table 9: Abbreviations andsymbols with the use of symbols 36 Table 10: Abbreviations andsymbols with the use of numbers 40 Table 11: Abbreviations andsymbols ... abbrs andsymbolsfor note-taking was pressented The use of abbrs andsymbolsfor note-taking has not been familiar with students in Vinh University and they also not know many of abbrs and symbols...