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 20 for “"alamouti"”.
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Software-Defined Radio Implementation of Two Physical Layer Security Techniques
… The second design involves a single-carrier Alamouti coding system with pseudo-random phase shifts applied to each transmit antenna, referred to as Phase-Enciphered Alamouti Coding (PEAC). The intended receiver has knowledge of the pseudo-random sequence and can undo these phase shifts when …
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New hybrid automatic repeat request (HARQ) scheme for 4x4 MIMO system, based on the extended alamouti quasi-orthogonal space-time bloc coding (Q-STBC), in invariant and variant fading channel
… is proposed and analized. Based on the Extended Alamouti Quasi-orthogonal Space-Time Block Coding (Q-STBC), the use of the so-called Alternative Matrices for transmission, depending on the Channel State Information (CSI) received as feedback, is compared to other existing solutions. Sign changes …
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Advanced receivers for space-time block-coded single-carrier transmissions over frequency-selective fading channels
… an MMSE-based turbo equalization scheme for Alamouti ST block-coded systems. A semi-analytical method to estimate the bit error rate (BER) is devised. Our results show that the proposed turbo equalization scheme offers significant performance improvements over one-pass equalization. Second, …
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Design and analysis of transmission strategies in wireless relay networks
… It is shown that the proposed distributed MIF Alamouti scheme can achieve a full diversity order, and outperforms various well-known distributed Alamouti schemes. Performance of the MIF scheme in two way relay channels (TWRC) is then investigated. Two novel MIF protocols, namely, network coded …
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Implementations of Multi-Antenna Systems in a USRP Based SDR using Simulink
… work in implementing the MISO method of Alamouti STBC. The processes used to implement the discussed techniques will be outlined and discussed including results from testing with the USRPs in Simulink.
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Evaluation of coding scheme for MIMO radar
… in this thesis a coding scheme related to the Alamouti scheme in Communication is presented, this scheme under some constraints is capable of maintaining orthogonality between the signals from different transmitters and therefore cancels the mutual interference among those signals. In general, …
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New hybrid automatic repeat request (HARQ) combining with space time block coding (STBC) in invariant and variant fading channel
… of a precombining HARQ scheme and the Multiple Alamouti Space-Time Block Coding (MASTBC), which is suitable for more than 2 transmit antennas. The combination of this two techniques increase the efficiency of the HARQ packet transmission by exploiting both the spatial and time diversity of the …
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Filmmaking at the borders: Improvisation and (Re)Presenting others
This practice-based research develops new improvisational filmmaking methods that move beyond problematic refugee narrativisation, particularly addressing how “sympathetic” portrayals often inadvertently reinforce the notion of refugees as “suffering subjects”. Through the making of a …
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I/Q imbalance mitigation for space-time block coded communication systems
… channels and the solutions are studied. A 2 Tx Alamouti system, a 4 Tx quasi-orthogonal STBC (QOSTBC) system, and a 4 Tx rotated QOSTBC (RQOSTBC) system with I/Q imbalance are studied in detail. By exploiting the special structure of the received signal, low-complexity solutions are proposed to …
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Joint relay beamforming and transceiver processing in multiuser relay network
… (AF) relays. A rank-two beamforming Alamouti scheme is proposed at the sources and relays, and we aim to minimize maximal individual relay power subject to pre-defined SINR requirements. The resulting non-convex optimization problem is solved by ordinary semi-definite relaxation (SDR) …
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Relay Diversity Techniques for OFDM and MC-CDMA
… 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 network, nodes are often …
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Non-orthogonal multiple access using guessing random additive noise decoding aided macrosymbols
… (CRC) codes or space time codes such as the Alamouti code. We use a soft detection variant of GRAND, a near maximum likelihood (ML) universal decoding algorithm that inverts noise effect sequences from a sequence of symbols to arrive at a codeword, to correct the received sequence of …
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Fast peak-power reduction for MIMO-OFDM systems with diversity
… gains of 4.19 and 3.57 dB under QPSK for Alamouti STBC and SFBC, respectively. In addition, we extend the e cient ACE-SGP method to rotated constellations for SISO-OFDM systems, an alternative method recently invented for providing diversity. Simulation results show approximately 3.46 dB …
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System Design and Performance Study for Wireless Information and Energy Transfer in the Internet of Things
… namely joint transmission NOMA (JT-NOMA) and Alamouti NOMA (A-NOMA), to combat the key challenge of inter-cell interference (ICI) in the multicell WIET networks. We show that A-NOMA can achieve a larger outage rate region than JT-NOMA and joint transmission OMA (JT-OMA) in high signal-to-noise …
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A hybrid-structure offset-QAM filter-bank multi-carrier MIMO system
… frequency selective Rayleigh fading channel. The Alamouti SFBC block coding is performed on the complex-orthogonal signal before OQAM processing, which resolves the problems of intrinsic interference when integrating OQAM/FBMC with MIMO. In better multipath channel conditions with a line-of-sight …
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Performance of MIMO Space-Time Coding Algorithms on a Parallel DSP Test Platform
… and develop MIMO wireless communication. The Alamouti, 2 x 2 and 4 x 4 differential space-time MIMO algorithms have been partially implemented on the receiver using a variety of common parallel processing topologies to include: bus, line/ring, star, grid, hypercube, binary tree, and pyramid. …
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Very High Speed Coherent Passive Optical Networks
… transmissions. The downstream solution uses Alamouti-coded transmission, which allows single polarisa- tion detection at the receiver. This enables greatly simplified receivers, such as the single polarisation heterodyne receiver, to be used at the ONU. Two such receivers are considered, one …
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Performance investigation of spatial modulation systems under realistic channel models
… Bell Labs layered space-time (V-BLAST), the Alamouti scheme are compared with SM under different simulation settings. Secondly, the BER performance of SM systems is studied under a non-stationary wideband HST GBSM considering the non-ideal channel estimation case. The timevarying behaviour of …
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Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression
A common practice for government defense agencies and commercial aeronautical companies is to use dual antennas on test flight air vehicles in order to overcome occlusion issues during high-speed telemetric maneuvers. The dual antennas, though never being masked at the same time, unfortunately lead …