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.
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Showing 1 to 20 of 21 for “"space-time codes"”.
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Space-Time Codes for High Data Rate Wireless Communications
Space-time codes (STC) are a class of signaling techniques, offering coding and diversity gains along with improved spectral efficiency. These codes exploit both the spatial and the temporal diversity of the wireless link by combining the design of the error correction code, modulation scheme and …
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Turbo space-time coding for mimo systems : designs and analyses
… Specifically, this dissertation studies turbo space-time coding schemes for MIMO systems. Before the designs of turbo space-time codes are presented, a fundamental tool to analyze and design turbo coding schemes, the extrinsic information transfer (EXIT) chart method, is extended from the …
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Turbo space-time coded modulation : principle and performance analysis
… coding was achieved with the invention of turbo codes. Turbo codes approach Shannon capacity by displaying the properties of long random codes, yet allowing efficient decoding. Coding alone, however, cannot fully address the problem of multipath fading channel. Recent advances in information …
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Information theory of transmit diversity and space-time code design
… loss. Then we derive performance criterion for codes concatenated to the simple diversity technique. After that, we propose some high-rate space time codes which use multiple antennas in order to increase the rate rather than improving communication reliability. At the end we note how some …
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A Framework for Spectrally Efficient Noncoherent Communication
… a frequency-nonselective channel in which the time-varying channel gain is unknown a priori , but is approximately constant over a coherence interval . Unless the coherence interval is large, coherent communication, which requires explicit channel estimation and tracking prior to detection, …
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Multiantenna Communications in the Presence of Feedback
… schemes in the general class of linear space-time codes when there is a partial CSI feedback link in the point-to-point multiple-input multiple-output (MIMO) system. The analysis provides insights into the optimality of the low-complexity transmit beamforming scheme in the presence of …
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DSP implementation of trellis coded modulation and distributed space time coding
… the process of encoding TCM, convolutional codes, decoding using the Viterbi Algorithm (VA), M-ary modulation formats suitable for TCM, and the evaluation of TCM performance.;The concept of multiple TCM, which is a generalization of ordinary TCM, gives rise to the concept of space time codes …
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Multiplexing, scheduling, and multicasting strategies for antenna arrays in wireless networks
… extensions for implementation, such as a unified time-domain precoder that compensates for both cross-channel and intersymbol interfer- ence. We then show how more sophisticated, channel-aware scheduling can reduce the complexity requirements of the array processing. The scheduling algorithms …
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Performance of codes based on crossed product algebras
… coding theory, with a particular focus on space-time codes constructed from crossed product algebras. This thesis is divided into three parts. In the first part we will present a method for constructing codes from crossed product algebras and derive bounds on their performance. The second …
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Relay Diversity Techniques for OFDM and MC-CDMA
… power and size of the mobile terminals. Space-time codes, such<br/>as the Alamouti/space-time block coding (STBC) and cyclic delay<br/>diversity (CDD) can provide diversity and coding gains in multipleinput<br/>multiple-output (MIMO) systems over fading channels.<br/>However in an ad-hoc …
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Non-orthogonal multiple access using guessing random additive noise decoding aided macrosymbols
… we introduce multiple access channel (MAC) codes, which are codes that are used to split the channel rate between users and correct errors due to the MAI. Each user has their information bits encoded with independent MAC codes, which can be short, low rate linear codes such as cyclic …
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Concatenation of Space-Time Block Codes with ConvolutionalCodes
… multiple antennas into communication systems. Space-time block codes present a way of introducing transmit diversity into the communication system with similar complexity and performance as maximal ratio receive combining. In this thesis we study the performance of space-time block codes in …
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High rate space time code with linear decoding complexity for multiple transmitting antennas
… can be employed to overcome the fading problem. Space time block codes (STBC) have been shown to be used well with the MIMO channel. Each type of STBC is designed to optimize a different criteria such as rate and diversity, while other characteristics of the code are its error performance and …
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Distributed Space-Time Message Relaying for Uncoded/Coded Wireless Cooperative Communications
… communication systems with distributed space-time block codes (DSTBC) in different relaying protocols and theoretically derive the BER performance for each scenario. The amplify-and-forward (AF) protocol is one of the most commonly used protocols at the relays. It has a low …
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Transmission and detection for space-time block coding and v-blast systems
… on topics of data transmission and detection of space -time block codes (STBC). The STBCs can be divided into two main categories, namely, the orthogonal space-time block codes (OSTBC) and the quasi-orthogonal space-time codes (Q-OSTBC). The space-time block coded systems from transceiver design …
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Reduced Rank Adaptive Filtering Applied to Interference Mitigation in Wideband CDMA Systems
… no loss in performance and significant signal subspace compression better than any previous reduced rank techniques have shown. This is important for optimizing performance because it implies a reduction in the number of required samples, so it lessens the requirement that the channel be …
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Multi-layered Space Frequency Time Codes
… compares decoding algorithms for multi-layered space time coded (MLSTC) systems. These are single user systems that combine spatial multiplexing and transmit diversity. Each layer consists of a space time code. The detection algorithms are based on multi-user detection theory. We consider joint, …
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Application of Machine Learning to Multi Antenna Transmission and Machine Type Resource Allocation
… First, with the goal of designing better space-time block codes for improved reliability, we propose to redesign the transmit and receive blocks of the physical layer. We replace a portion of the transmit chain - from modulation to antenna mapping with a neural network. Similarly, the …
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Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression
… antennas, though never being masked at the same time, unfortunately lead to a drastic increase in nulls in the signal pattern. The result of this interference pattern can be compared to the effect of fading in a multiple-input multiple-output (MIMO) multi-path scattering environment. Confidence …
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Near-capacity MIMOs using iterative detection
… of MIMO channel estimation, a Differential Space-Time Spreading (DSTS) scheme is designed that employs non-coherent detection. Additionally, in order to maximise the coding advantage of DSTS, it is combined with Sphere Packing (SP) modulation. The related capacity analysis shows that the …
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