Blind channel estimation for MIMO OFDM communication systems

... this thesis is the development of three blind channel estimation and one blind source separation algorithms for MIMO- OFDM systems The ﬁrst proposed channel estimation algorithm is a subspace based ... BLIND CHANNEL ESTIMATION FOR MIMO OFDM COMMUNICATION SYSTEMS CHEN XI (M.Sc., National University of Singapore, Singapore) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR ... transferred to a number of parallel ﬂat-fading MIMO channels [6] • In Chapter 3, we present a novel subspace based blind channel estimation algorithm for MIMO- OFDM systems driven by either white or colored...

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...

MIMO OFDM COMMUNICATION SYSTEMS

... plays a signiﬁcant role for MIMOOFDM systems For this reason, it is the ﬁrst part of my dissertation to work on channel estimation of MIMO- OFDM systems The maturing of MIMO- OFDM technology will lead ... referred to as OFDM Since we aim at performance enhancement for wireless communication systems, we use the term OFDM throughout this thesis Furthermore, we only use the term MIMO- OFDM while explicitly ... formulates the channel estimation problem for MIMO- OFDM systems and proposes a pilot-tone based estimation algorithm A complex equivalent baseband MIMO- OFDM signal model is presented by matrix representation...

Báo cáo sinh học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" ppt

... an open-loop MIMO OFDM-CDMA scheme using space-timefrequency spreading (STFS), in the presence of frequency-selective Rayleigh-fading channel The BER and BLER performance of the OFDM-CDMA system ... scheduling In addition, it offers better diversity/multiplexing trade-off The performance of MIMO OFDM–CDMA scheme using STFdomain spreading is investigated with zero-forcing (ZF) receiver It is ... section, joint space-time-frequency spreading is proposed for the downlink of an openloop multi-user system employing single-user MIMO (SU -MIMO) system based on OFDMCDMA system A MIMO OFDM channel...

Báo cáo toán học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" pptx

... N c , the OFDM-CDMA 60 Proposed OFDM-CDMA 2D OFDM-CDMA Number of Users 50 40 30 20 10 0 10 12 14 16 SNR dB Figure 10 System throughput comparison for OFDM-CDMA system with 4Tx, 4Rx of the proposed ... scheduling In addition, it offers better diversity/multiplexing trade-off The performance of MIMO OFDM-CDMA scheme using STF-domain spreading is investigated with zero-forcing (ZF) receiver It ... doi:10.1186/1687-6180-2011-139 Cite this article as: Dahman and Shayan: Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems EURASIP Journal on Advances in Signal Processing...

Báo cáo hóa học: " Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications" pptx

... 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...

báo cáo hóa học: " Adaptive low-rank channel estimation for multiband OFDM ultra-wideband communications" docx

Báo cáo hóa học: "Research Article A Practical, Hardware Friendly MMSE Detector for MIMO-OFDM-Based Systems" pptx

... on an FPGA has a single-clock latency Based on the complexity assessment in this section and the fact that we target an FPGA implementation where a number of dedicated multipliers are available, ... enhances numerical stability; and (d) an aggressive time-shared VLSI architecture The above techniques are quite general and are readily applicable to any MMSE- based MIMO detector implementation CONCLUSION ... [3] A J Paulraj and C B Papadias, “Space-time processing for wireless communications,” IEEE Signal Processing Magazine, vol 14, no 6, pp 49–83, 1997 [4] A J Paulraj, D A Gore, R U Nabar, and...

Báo cáo hóa học: " Blind Channel Estimation for Space-Time Coded WCDMA Youngchul Sung" potx

... 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...

Báo cáo hóa học: " Maximum Likelihood Turbo Iterative Channel Estimation for Space-Time Coded Systems and Its Application to Radio Transmission in Subway Tunnels" potx

... 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...

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...

Semi-blind signal detection for mimo and mimo-ofdm systems

... to algorithms for standard MIMO- OFDM systems and it is robust against channel length overestimation The number of words: 460 Semi-Blind Signal Detection for MIMO and MIMO- OFDM Systems by Ma Shaodan ... the problem of signal detection and proposes three semi-blind algorithms for MIMO, MIMO- OFDM with short cyclic prefix (CP), and MIMOOFDM without CP, respectively A three-step semi-blind Rake-based ... thesis entitled Semi-Blind Signal Detection for MIMO and MIMO- OFDM Systems Submitted by Ma Shaodan for the degree of Doctor of Philosophy at The University of Hong Kong in May 2006 MIMO (Multiple...

Báo cáo sinh học: " Research Article Time-Frequency Based Channel Estimation for High-Mobility OFDM Systems—Part II: Cooperative Relaying Case" pptx

... 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...

Báo cáo hóa học: " Research Article Degenerated-Inverse-Matrix-Based Channel Estimation for OFDM Systems" pdf

... 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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