preamble and pilot symbols for channel estimation

... 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

... 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} and channel 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...

Ngày tải lên: 21/06/2014, 22:20

... 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

... 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 = and channel estimation 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 and channel estimation 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 = and channel estimation with 10 pilot blocks...

Ngày tải lên: 21/06/2014, 16:20

... 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 ... (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

... multiple OFDMA symbols We also present a performance analysis of the channel estimation approach and derive a closed-form expression for the channel estimation variances It is shown that the estimation ... 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 ... the information sequence on the channel estimation at receiver In [24], an iterative approach is provided where the information sequence is exploited to enhance the channel estimation performance...

Ngày tải lên: 21/06/2014, 23:20

... worse estimation performance relative to the MMSE estimator However, it is intractable to perform MMSE channel estimation for 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, Channel estimation for amplify u and forward ... Kim, and H Park, “OFDM channel estimation for the amply -and- forward cooperative channel, ” in Proceedings of the 65th IEEE Vehicular Technology Conference (VTC ’07), pp 1642–1646, Dublin, Ireland,...

Ngày tải lên: 22/06/2014, 00:20

... approximative analytical expression for the Gaussian Cramer-Rao bound (GCRB) for channel estimation when the pilot symbols are distributed over the guard interval and pilot carriers The paper is organized ... modulated by the pilot symbols and the data symbols, respectively, with I p ∪ Id = {0, , N − 1} Hence, the symbol vector a contains M − ν pilot symbols bc and N + ν − M data symbols which are ... bound, related to for data-aided channel estimation in KSP-OFDM, when the pilot symbols are distributed over the guard interval and pilot carriers An analytical expression for the GCRB is derived...

Ngày tải lên: 22/06/2014, 19:20

... 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 ... 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, Channel estimation and ... illustrating some numerical results, we provide a theoretical analysis and derive an approximate closed-form formula for the channel estimation mean square error (CEMSE) at a given iteration of the...

Ngày tải lên: 22/06/2014, 22:20

... 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 for channel estimation purposes In the global system mobile (GSM) standard, this sequence is ... this paper, we present a novel channel estimation technique that gathers both the deterministic information corresponding to the pilot sequence and the statistical information, in terms of a posteriori...

Ngày tải lên: 23/06/2014, 01:20

... 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 ... 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 ... 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...

Ngày tải lên: 23/06/2014, 01:20

... NMSE performance comparison of CMLE and IMLE 26 3.4 NMSE performance comparison for various channel estimation methods 29 3.5 FER performance comparison for various channel estimation ... for channel estimation In this approach, the pilot signals in each OFDM symbol are mainly used for phase offset tracking and correction Channel estimation 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 channel estimation methods...

Ngày tải lên: 12/09/2015, 09:39

... re-modulation is robust to the channel order over -estimation, and the channel estimation 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 channel estimation Channel estimation for 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 Channel estimation MSEs versus SNR for different estimated channel order...

Ngày tải lên: 14/09/2015, 11:54

... the first M symbols of each block of N symbols are used for estimation of channel information, more explicitly, to estimate H and Σ 4.2.2 Channel estimation During the first M pilot symbols of ... 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 ... 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...

Ngày tải lên: 03/10/2015, 11:37

... abbrs and symbols .29 Table 5: The problems when using abbrs and symbols .30 Table 6: The reasons for using abbrs and symbols in note-taking .31 Table 7: Ways to create the abbrs and symbols ... abbrs and symbols .33 Table 9: Abbreviations and symbols with the use of symbols 36 Table 10: Abbreviations and symbols with the use of numbers 40 Table 11: Abbreviations and symbols ... abbrs and symbols for note-taking was pressented The use of abbrs and symbols for note-taking has not been familiar with students in Vinh University and they also not know many of abbrs and symbols...

Ngày tải lên: 25/12/2013, 20:21

Ngày tải lên: 17/04/2014, 15:34