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...

Ngày tải lên: 04/10/2015, 10:26

... 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...

Ngày tải lên: 10/11/2015, 11:28

... 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 si...

Ngày tải lên: 21/06/2014, 05:20

... 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 Carrie...

Ngày tải lên: 23/06/2014, 01:20

... 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 sy...

Ngày tải lên: 20/11/2012, 11:28

... 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 p...

Ngày tải lên: 21/06/2014, 08:20

... 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 snap...

Ngày tải lên: 14/09/2015, 11:54

... 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 opti...

Ngày tải lên: 15/09/2015, 17:10

... …………………………………………………… 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 SU...

Ngày tải lên: 08/11/2015, 17:16

... 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 | in...

Ngày tải lên: 22/06/2014, 23:20

... 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...

Ngày tải lên: 04/10/2015, 10:26

... 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...

Ngày tải lên: 22/06/2014, 20:20

... 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...

Ngày tải lên: 21/06/2014, 08:20

... 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...

Ngày tải lên: 21/06/2014, 11:20

... 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 ex...

Ngày tải lên: 21/06/2014, 22:20