Decoupled maximum likelihood carrier frequency offset estimator for MIMO OFDM systems
Decoupled maximum likelihood carrier frequency offset estimator for MIMO OFDM systems
... is reduced when carrier frequency offset exsists Hence the performance of the OFDM systems is degraded In order to improve the performance of OFDM systems, the carrier frequency offset must be ... receiver (MIMO) technology in combination with OFDM, i.e., MIMO- OFDM, therefore becomes an attractive solution for future broadband wireless systems Similar to SISO -OFDM systems, MIMO- OFDM systems ... introduced and compared Performance of the proposed DEML (Decoupled Maximum Likelihood) blind carrier offset estimator for SISO -OFDM and MIMO- OFDM systems is analyzed in Chapter and Chapter 5, respectively...
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Low cost blind carrier frequency offset estimator for mimo multicarrier systems
... Summary……………………………………………………………….….44 iv Low- cost Blind CFO Estimator for MIMO Multicarrier Systems …… …45 5.1 Introduction……………………………………………………………… 45 5.2 MIMO Multicarrier System Model…………………………………… …46 5.3 Blind CFO Estimator ……………………………………………… ... existing blind CFO estimation algorithm with high computational cost to a low- cost estimator for multicarrier systems Then, the proposed estimator is extended to the MIMO multicarrier systems, ... LOW- COST BLIND CARRIER FREQUENCY OFFSET ESTIMATOR FOR MIMO MULTICARRIER SYSTEMS LI MI (B Eng, SJTU) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING...
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Báo cáo hóa học: " Research Article Carrier Frequency Offset Estimation for Multiuser MIMO OFDM Uplink Using CAZAC Sequences: Performance and Sequence Optimization" ppt
... Communications and Networking were conducted to evaluate the performance of the CFO estimation using CAZAC sequences We first compare the performance using CAZAC sequences with the performance using two ... the performance of the CFO estimation using CAZAC sequences and demonstrate the performance gain achieved by using the optimal training sequences In the simulations, we assume a multiuser MIMO- OFDM ... of CAZAC sequences: (i) Frank and Zadoff Sequences [18], (ii) Chu Sequences [19], (iii) Polyphase Sequence by Sueshiro and Hatori (S&H Sequences) [20] Both Frank and Zadoff sequences and S&H sequences...
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Báo cáo hóa học: " Non-Data-Aided Feedforward Carrier Frequency Offset Estimators for QAM Constellations: A Nonlinear Least-Squares Approach" potx
... This paper analyzed the performance of a class of non-dataaided feedforward carrier frequency offset estimators for linearly modulated QAM- signals It is shown that this class of cyclic frequency ... for conjugation and conjugate transposition, respectively The notations “re” and “im” stand for the real and imaginary parts, respectively Non-Data-Aided Feedforward Carrier Frequency Estimators ... describes a class of non-data-aided feedforward carrier FO estimators, and Section briefly illustrates the equivalence between these FO estimators and the NLS spectrum estimators Based on this equivalence,...
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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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Báo cáo hóa học: " Research Article Automatic IP Generation of FFT/IFFT Processors with Word-Length Optimization for MIMO-OFDM Systems" doc
... FFT processors and aim to offer an FFT IP generator that has the capability of automatic wordlength optimization to achieve hardware efficiency The IP generator can generate the hardware description ... used in advanced systems With our proposed architecture, the advantage is twofold On one hand, the same control flow as the one needed for generation of multiple-channel FFT processors can be shared ... number of ip- flops is related with the pipeline registers and short delay buffers, while the number of slices reflects the logic complexity including distributed RAMs for long delay buffers and ROMs for...
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Robust synchronization and channel estimation for MIMO OFDM systems
... 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 ... BERs for SISO OFDM under different p 94 ¯ 5.4 Performance NMSEs for MIMO OFDM versus SNR 5.5 Performance NMSEs for MIMO OFDM versus number of snapshots 96 5.6 BERs for MIMO OFDM ... Channel Estimation for MIMO OFDM Systems 72 5.1 Introduction 72 5.2 System Model 74 5.3 Blind Channel Estimation for SISO OFDM Systems...
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Transmit and receive techniques for MIMO OFDM systems
... for a MIMO- OFDM system in wideband frequency selective MIMO channels, and more specifically the appropriate spacetime precoding schemes and transmitter and receiver designs for a MIMO- OFDM system ... near-optimal capacity and diversity performance in MIMO- OFDM channels, optimal and efficient detection and decoding of transmitted sequence at the receiver, and optimal training signal design and low-complexity ... concerned in general with the transmit and receive techniques for multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems in wideband frequency selective fading...
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Iterative receiver design for MIMO OFDM systems via sequential monte carlo (SMC) techniques
... …………………………………………………… 47 3.6 Sequential Monte Carlo Methods …………………………… 51 2.3.2 2.3.3 Iterative Receiver Design for MIMO- OFDM Systems via Sequential Monte Carlo (SMC) techniques ………………………… 53 ... ITERATIVE RECEIVER DESIGN FOR MIMO- OFDM SYSTEMS VIA SEQUENTIAL MONTE CARLO (SMC) TECHNIQUES BAY LAY KHIM (B.Eng.(Hons.), NUS) A THESIS SUBMITTED FOR THE DEGREE OF MASTER ... 84 Iterative Receiver Design for MIMO- OFDM Systems via SMC Techniques with Pilot Aided Channel Estimation (PACE) ………… 86 5.1 Background …………………………………………………… 86 5.2 System Model of Coded MIMO- OFDM...
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Báo cáo hóa học: "Performance Analysis of the Blind Minimum Output Variance Estimator for Carrier Frequency Offset in " pot
... In this paper, we have examined the performance of the minimum output variance (MOV) estimator in OFDM systems The variance and the expectation of the output magnitude have been derived for the ... but the CFO causes the uncertainty of the output More frequency offset causes more uncertainties and thus, the variance of the output |dk | increases This is the principal idea for the CFO estimator ... Professor in the Division of Communication Engineering His research interests are in the areas of signal processing for communications, with special interests in the performance evaluations of...
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Decoupled maximum likelihood channel estimator for space time block coded system
... STBC space- time block codes STTC space- time trellis codes LST layered space- time USTM unitary space- time modulation CSI channel state information DEML decoupled maximum likelihood ML maximum likelihood ... efficient channel estimation scheme based on the decoupled maximum likelihood (DEML) algorithm is introduced for space- time block coded (STBC) system The BER performance of the STBC system with ... DEML CHANNEL ESTIMATOR 27 4.1 Problem Formulation 27 4.2 DEML Channel Estimator 29 4.3 Properties 32 ii CHAPTER 5: PERFORMANCE OF DEML CHANNEL ESTIMATOR UNDER UNCORRELATED FADING CHANNEL 35 5.1 System...
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Báo cáo hóa học: " Research Article Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems" pot
... standardcompatible frequency estimation and I/Q imbalance compensation algorithms by using the preamble defined in IEEE 802.11a [6, 9] A system model with the carrier frequency offset and I/Q imbalance ... presented a low-cost and preambleaided algorithm for the estimation/ compensation of carrier frequency offset and I/Q imbalance in OFDM systems It has been shown that the proposed frequency offset estimator ... an OFDM system using the proposed frequency offset and I/Q imbalance estimation/ compensation algorithms Each OFDM frame is assumed to contain 10 short symbols followed by 10 OFDM symbols The I/Q...
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Báo cáo hóa học: " Research Article Novel Techniques of Single-Carrier Frequency-Domain Equalization for Optical Wireless Communications" doc
... performance of optical OFDM The nonlinear characteristic of an LED imposes limitations on the performance of indoor DOW systems when using intensity modulation with both ACOOFDM and DC-biased OFDM ... “Comparison of asymmetrically clipped optical OFDM and DC-biased optical OFDM in AWGN,” vol 12, no 5, pp 343–345 [10] H Elgala, R Mesleh, and H Haas, “A study of LED nonlinearity effects on optical wireless ... 0.01 W, the performances of all SCFDE schemes are almost the same due to their lower PAPR For an input signal power of W for QPSK and 0.1 W for 16 QAM and 64 QAM, DQO-SCFDE performs better than...
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Báo cáo hóa học: " Research Article Bit Error Rate Approximation of MIMO-OFDM Systems with Carrier Frequency Offset and Channel Estimation Errors" ppt
... SISO-OFDM The BER is degraded due to the frequency offset and channel estimation errors For a fixed channel estimation variance error σΔH , a larger variance of frequency offset estimation error, ... 1025– 1030, 2009 [32] Z Zhang, W Zhang, and C Tellambura, “BER of MIMOOFDM systems with carrier frequency offset and channel estimation errors,” in Proceedings of IEEE International Conference on ... function of the second-order statistics of the channel and frequency offset estimation errors (although the interference also comprises the fourth-order statistics of the frequency offset estimation errors,...
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Báo cáo hóa học: " Research Article Effects of Carrier Frequency Offset, Timing Offset, and Channel Spread Factor on the Performance of Hexagonal Multicarrier Modulation Systems" doc
... on SINR for hexagonal multicarrier system channel spread factor on the performance of SINR in hexagonal multicarrier modulation systems are further discussed The exact SINR expression versus insufficient ... and channel spread factor on the performance of SINR in hexagonal multicarrier modulation systems are further discussed The exact SINR expression versus CFO, TO, and channel spread factor is derived ... that the power of the ISI and ICI caused by TO strongly depends on the channel spread factor of DD channel The maximum SINR timing decreases with the product τrms fd increasing, and the timing...
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