Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Channel matrix"”.
-
An Examination into the Statistics of the Singular Vectors for the Multi-User MIMO Wireless Channel
… in multiple-input-multipleoutput (MIMO) wireless channels make use of the singular value decomposition (SVD) of the channel matrix. For the multi-user case, the SVD of the channel matrix for each user may result in right and left singular vectors that are similar between users. This proposes …
-
Multiple-input multiple-output visible light communication receivers for high data-rate mobile applications
… to dynamically control the resulting wireless channel matrix to enable relatively few photodetectors to reliably receive from multiple transmitters despite their movements. As part of our analysis, we develop a MIMO VLC channel capacity model that accounts for the non-negativity and peak-power …
-
A Study of Wireless Modem Performance Using Multiple Element Antennas
… the demand for high data rate. In correlated channels Channel State Information (CSI) at the transmitter provides a significant capacity increase over conventional Multiple Input Multiple Output (MIMO) systems. In such a case, the Singular Value Decomposition (SVD) of the channel matrix gives …
-
New hybrid automatic repeat request (HARQ) combining with space time block coding (STBC) in invariant and variant fading channel
… and M receive antennas (NxM) in a time invariant channel and in a time varying channel is proposed and its performance is analyzed. Based on the measured channel matrix, the receiver chooses the best retransmission order and communicated it to the transmitter. The scheme, where this algorithm is …
-
Optimal designs for linear and nonlinear precoders and decoders
… method to make the eigenvectors of the precoder matrix match to the eigenvectors of the circulant channel matrix to maximize the information rate and use discrete fourier transform matrix and an MMSE decoder to minimize the bit error rate. We manage to maximize the information rate and to …
-
Velocity distributions in a plate heat exchanger channel
… on flow behaviour through a single cell in the channel matrix. The objective of the study was to extend previous investigations of plate heat exchanger flow patterns in the laminar range with the eventual aim of establishing the effect of flow patterns on heat transfer performance, thus leading …
-
Adaptive Neural Signal Detection for Massive MIMO
… MIMO detection with promising results on simple channel models (e.g., i.i.d. Gaussian entries). However, we find that the performance of these schemes degrades significantly in real-world scenarios in which the channels of different receivers are spatially correlated. The root of this poor …
-
The optimization of multiple antenna broadband wireless communications. A study of propagation, space-time coding and spatial envelope correlation in Multiple Input, Multiple Output radio systems
… coded OFDM transmitter over a multipath Rayleigh channel, and a receiver which uses a selection combining diversity technique. The performance of this combined scenario is characterised in terms of the bit error rate and throughput. A novel four element QOSTBC scheme is introduced, it is created …
-
Feedback schemes in angular domain processing for MIMO antenna systems
… multiplexing of multiple data streams onto the channel and an increase in the channel’s capacity or improved reliability against multipath fading. An MIMO antenna system with Nt transmit antennas and Nr receive antennas, under suitable fading conditions will yield a min(Nt,Nr) degree of freedom …
-
Private audio delivery in reverberant spaces
… null space of the multiple-input-multiple-output channel matrix; we refer to it as the Null Space (NS) method. The two methods are evaluated and compared in numerical and real-world experiments. Both methods are shown to achieve sound focusing as well as very low signal-to-noise ratio (SNR) …
-
Different Multiple Input Multiple Output Systems
… the constellation size across different subchannels. In this work we study the VBLAST and SVD architectures and compare the perfor- mance and computing power requirement of these architectures. Also in this study a new effcient decoding method for the VBLAST architecture is proposed. The …
-
Adaptive and Robust Multi-Gigabit Techniques Based MmWave Massive MU-MIMO Beamforming For 5G Wireless and Mobile Communications Systems. A Road Map for Simple and Robust Beamforming Scheme and Algorithms Based Wideband MmWave Massive MU-MIMO for 5G Wireless and Mobile Communications Systems
… over large scale fading wideband mmWave /Raleigh channels. Firstly, three beamforming based diagonalize the Equivalent Virtual Channel Matrix (EVCM) schemes with the optimal linear combining methods are presented to overcoming the self-interference problems in Quasi-Orthogonal-Space Time Block …
-
Efficient tranceiver [sic] techniques for interference and fading mitigation in wireless communication systems
… due to the dynamic nature of the wireless channel caused by multipath fading and Doppler spread. In order to mitigate the negative impact of the channel to the received signal quality, techniques as equalization and diversity are usually employed in the system design. During the …
-
Modeling, Analysis, and Real-Time Design of Many-Antenna MIMO Networks
… at the PHY layer, such as the rank-deficient channel phenomenon. This calls for new theories and models for many-antenna MIMO in a networking environment. In addition, the problem space for many-antenna MIMO systems is much broader and more challenging than conventional MIMO. Reusing existing …
-
Channel Probing for an Indoor Wireless Communications Channel
… all three of these parameters for a 7 GHz channel. A system was built to measure these multipath parameters at 2.4 GHz for multiple locations in an indoor environment. Another system was built to measure the angle of transmission for a 6 GHz channel. The addition of this parameter allows …