... BERs for SISO OFDM under different p 94 ¯ 5.4 Performance NMSEs forMIMOOFDM versus SNR 5.5 Performance NMSEs forMIMOOFDM versus number of snapshots 96 5.6 BERs forMIMOOFDM ... fact, MIMO has gained its application in various standards Table 1.1 provides an overview of all current MIMO standards and their technologies 1.3 MIMO- OFDMsystem The signaling schemes in MIMO systems ... Current MIMO standards and the corresponding technologies Standard Technology WLAN 802.11n OFDM WiMAX 802.16-2004 OFDM/ OFDMA WiMAX 802.16e OFDMA 3GPP Release WCDMA 3GPP Release (LTE) OFDMA 802.20 OFDM...
... a MIMO- OFDMsystem in wideband frequency selective MIMO channels, and more specifically the appropriate spacetime precoding schemes and transmitter and receiver designs for a MIMO- OFDMsystem ... receiver for BICM GSTBC -OFDM systems leaver and deinterleaver, respectively and −1 stand for inter- 94 5.2 Comparison of the exact and approximated SDF’s for 16QAM ... pre-transform can be used with OFDM Therefore, how to achieve the required multiplexing gain and diversity gain from the spatial and frequency domains is an important design issue for MIMO- OFDM systems...
... 2: OFDM systems andMIMO systems Since the thesis studies the channel estimation forOFDM systems andsystem capacity for MIMO- OFDM systems, this chapter briefly introduces the background of OFDM ... Synchronization of OFDM systems 38 2.2.5 Advantages and disadvantages of OFDM systems 39 2.3 MIMO systems 40 2.3.1 Basic MIMOsystem model 40 2.3.2 Functions of MIMO systems ... Chapter 5: MIMO- OFDMsystem capacity with imperfect feedback channel 118 5.1 The open-loop and closed-loop capacity forMIMO Systems 119 5.1.1 MIMOsystem model 119 5.1.2 MIMO system...
... de Jong, and T Willink, “TurboMIMO for wireless communications,” IEEE Communications Magazine, vol 42, no 10, pp 48–53, 2004 [4] J Liu and J Li, “Turbo processing for an OFDM- based MIMO system, ” ... that are used as extrinsic information forMIMO demapping and CIR, CFO, and SFO estimation as follows The purpose of MIMO- demapper is to compute the extrinsic soft bit information: (8) where P N ... convolutionalcoded MIMO- OFDMsystem In the investigation, the OFDM- related parameters are set to be similar to that given by IEEE standard 802.11a [15] QPSK is employed for data OFDM symbols, each...
... processor forMIMOOFDM systems,” IEEE Transactions on Circuits and Systems I, vol 54, no 4, pp 807–815, 2007 [7] Y Chen, Y W Lin, Y C Tsao, and C Y Lee, “A 2.4-Gsample/s DVFS FFT processor forMIMOOFDM ... 2006 S Saponara, N E L’Insalata, and L Fanucci, “Low-complexity FFT/IFFT IP hardware macrocells forOFDMand MIMOOFDM CMOS transceivers,” Microprocessors and Microsystems, vol 33, no 3, pp 191–200, ... r23 SDF-kR for efficient FFT processor in MIMO- OFDM systems,” IEICE Electronics Express, vol 6, no 24, pp 1702–1707, 2009 BO Fu and P Ampadu, “An area efficient FFT/IFFT processor for MIMO- OFDM WLAN...
... MIMO- OFDM subsystem For a multiuser scenario, each user can be allocated one or more MIMO- OFDM subsystems depending on the system complexity and requirement The block diagram of a MIMO- OFDMsystem ... preserving both diversity and coding gain, a MIMO- OFDMsystem typically is partitioned into Ns MIMO- OFDM subsystems where Ns ≥ It is pointed out in [28] that the MIMOOFDM system capacity with grouping ... antennas where Γ = The MIMO- OFDMsystem has two transmit antennas, 512 subcarriers, and a bandwidth 16 MHz Each MIMOOFDM subsystem has four well-separated subcarriers and the subcarrier interval...
... multipleoutput (MIMO) systemMIMO systems employ multiple antennas at both the transmitter and receiver MIMO- OFDM combines OFDMandMIMO techniques thereby achieving spectral efficiency and increased ... broadband systems The use of MIMO technology in combination with OFDM, i.e., MIMO- OFDM [5,6,7], therefore becomes an attractive solution for future broadband wireless systems MIMO- OFDM is a technology ... and multiple antennas at 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...
... decoder OFDM Mod Binary data Channel Encoder MIMO Encoder OFDM Mod OFDM Mod NT − OFDM Demod Recovered binary data Channel Decoder MIMO Decoder OFDM Demod OFDM Demod N R −1 Fig 9: MIMO- OFDMsystem ... Convolutional coded MIMO- OFDMsystem with PACE for data transmitted over a UNI channel with Td = 1.02μ s ……………………… 98 35 Comparisons of × and × Convolutional coded MIMO- OFDM systems with PACE for data transmitted ... 2.2.2 MIMO- OFDMSystem Model The single-input single-output OFDM case can be easily extended to the MIMO case by performing the IFFT/FFT and insertion/removal of CP operations at each transmit and...
... to algorithms for standard MIMO- OFDM systems and it is robust against channel length overestimation The number of words: 460 Semi-Blind Signal Detection forMIMOand MIMO- OFDM Systems by Ma Shaodan ... Detection forMIMOand 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 Input Multiple Output) and MIMO- OFDM ... algorithms for MIMO, MIMO- OFDM with short cyclic prefix (CP), and MIMOOFDM without CP, respectively A three-step semi-blind Rake-based multi-user detection technique is proposed for quasi-synchronous MIMO...
... technique with IQ imbalance and crosstalk compensation for broadband MIMOOFDM transmitters“ by Fernando Gregorio, Juan E Cousseau, Stefan Werner, Taneli Riihonen, and Risto Wichman where a stochastic ... coding for multiuser MIMO SC-FDMA systems: Specific issuesfor users with different spectral allocations“ by Cristina Ciochina, David Mottier, and Damien Castelain In the first paper a MCCDMA system ... Space-time-frequency block coded system are analyzed for PAPR reduction in “PAPR Reduction in SFBC MIMO MC-CDMA Systems via User Reservation“ by Mariano Garcia Otero and Luis A Paredes-Hernandez as well as “Low...
... generation wireless systems is OFDM- CDMA OFDM is the main air interface for LTE system, and on the other hand, CDMA is the air interface for HSPA+, so by combining both we can implement a system that ... alphabet and having unit average energy (Es = 1) B MIMOOFDM CDMA system We will now focus on the downlink of a multi-access system that employs multiple antennas forMIMOOFDM CDMA system As ... Fig MIMO OFDM- CDMA system block diagram Fig (T-F) Time-frequency mapping Fig Probability density function for SINR for Es /σ =20 dB for our proposed scheme (solid) and 2D OFDM- CDMA (dotted), for...
... alphabet and having unit average energy (Es = 1) B MIMO OFDM- CDMA system We will now focus on the downlink of a multi-access system that employs multiple antennas forMIMO OFDM- CDMA system As ... the system parameters N t , and 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 ... our proposed OFDM- CDMA system compared to 2D OFDM- CDMA system, which means that the average SINR for our proposed system will be more likely to be higher than that of the 2D OFDMCDMA system This...
... that represent pilot positions are initialized at random values between and 127 for the system which has 128 subcarriers, andand 63 for the system which has 64 subcarriers All the possible combinations ... PSO And by optimizing both placement and power of pilot tones, the performance of LS channel estimation algorithm is increased This article is organized as follows: the MIMO- OFDMsystem model and ... response hq can be estimated by LS algorithm: IFFT input Data and (4) p=1 T ⎡ MIMO- OFDMsystem model The block diagram of MIMO- OFDMsystem that has Nt transmit antennas, Nr receive antennas is...
... Note that in MIMO- OFDM systems, the SINR at each subcarrier is an RV parameterized by the frequency offset and channel attenuation In order to derive the average SINR of MIMO- OFDM systems, (22) ... higher than that of SISO -OFDM systemFor each MIMO scenario, MRC outperforms EGC The BER degradation due to the residual frequency offsets is shown in Figure for σΔH = 10−3 and Eb /N0 = 10 dB (Eb ... independent and identically distributed (i.i.d.) RV This paper is organized as follows The MIMO- OFDMsystem model is described in Section 2, and the SINR degradation due to the frequency offset and channel...
... matrices within 2.77 μs and provide a data throughput of 420 Mbps for a 64QAM × MIMOsystem Tables and show the resource usage, throughput, and latency results for this work and some prior work in ... architectures forMIMOOFDM systems,” in Proceedings of the 39th Asilomar Conference on Signals, Systems and Computers, pp 75–81, Pacific Grove, Calif, USA, OctoberNovember 2005 I LaRoche and S Roy, ... schemes in the 802.11n standard and as such will be more sensitive to the quantization noise and stability issues that plague finite precision systems The required bit precisions for the four alternative...
... of Electrical and Computer Engineering, Queen’s University, Kingston, Ontario, Canada, 2003 Channel Estimation and Data Detection forMIMO Systems [21] S B¨ ro, G Bauch, A Pavlic, and A Semmler, ... 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 ... N data vectors are used for training, so that the desired user’s channel matrix and interference statistics can be estimated, and the remaining data vectors are for information transmission In...
... thesis, and present some prospective work in order to address future key problems in MIMO- OFDM communication systems Chapter MIMO- OFDMSystem Model 2.1 Introduction In general, a MIMOsystem ... functions of WLAN systems In fact, a popular vision suggests to combine WLAN systems for high peak data rates with cellular systems for wide area-coverage, and to allow inter -system handovers [18] ... the principle of OFDM is explained Second, the combination of MIMOandOFDM is described The core idea is that the wideband frequency-selective MIMO channel by means of the MIMO- OFDM processing...
... were handled through supermarkets and grocery stores, mass merchandisers, and club stores Meanwhile, independent natural product and health food stores and natural grocery chains accounted for ... facing US versus foreign producers, and must take advantage of the unique niche provided by CSREES and the Land Grant system A quick overview of what foreign competitors are doing, and how other ... framework (Dimitri and Oberholtzer, 2005) including: • conversion and support payments for organic lands (62% of organic lands received some level of support in 2001), • targets for land under organic...
... dev and test data for IWSLT and NIST tasks In both experiments, we used four systems, as listed in Table 2, they are phrase-based system Moses (Koehn et al., 2007), hierarchical phrasebased system ... rank of the hypothesis And we assign the same weights to each systemFor selecting the backbone, only the top hypothesis from each system is considered as a candidate for the backbone Concerning ... best single systems’ scores; row MBR is the scores of backbone; GIZA++, TER, CLA, IHMM stand for scores of systems for four word alignment methods MBR decoding slightly improves the performance...