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 78 for “"Multiple antennas"”.
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Blind multidimensional matched filtering for wireless channelswith multiple antennas
… of the channel. For receivers, employing multiple antennas, it is well known that the optimal detection strategy is to pass the received signals through a multidimensional matched filter. For this reason a signal transmission strategy similar to that of the BMF receiver would definitely …
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Design of optimal equalizers and precoders for MIMO channels
… to a fixed transmit-power constraint for the multiple antennas downlink communication channels under the perfect reconstruction (PR) condition. The closed form solutions are derived and an efficient design algorithm is proposed. The performance evaluations indicate that the optimal precoder …
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Concatenation of Space-Time Block Codes with ConvolutionalCodes
Multiple antennas help in combating the destructive effects of fading as well as improve the spectral efficiency of a communication system. Receive diversity techniques like maximal ratio receive combining have been popular means of introducing multiple antennas into communication systems. …
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Analysis and Cross -Layer Design of Medium Access and Scheduling in Wireless Mesh Networks
… where the nodes are equipped with beamforming multiple antennas. We also study the cross-layer optimization problem for WMNs which employ IEEE 802.11 type simple transceivers, and design a completely distributed cross-layer resource allocation scheme that incorporates PHY layer power control …
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Transmitter precoding for multi-antenna multi-user communications
… receiver. Interference rejection algorithms and multiple antenna techniques can significantly reduce the bit-error-rate at the receiver. Unfortunately, while interference rejection algorithms burden the receiver with heavy signal processing functionalities, thereby increasing the power …
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Coding techniques for multicasting
… study the scenario in which one transmitter with multiple antennas distributes a common message to a large number of users. For a system with a fixed number (L) of transmit antennas, we show that, as the number of users (K) becomes large, the rate of the worst user decreases as O(K-(1/L)). Thus …
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Automatic Modulation Classication and Blind Equalization for Cognitive Radios
… to develop an AMC that can classify signals from multiple users simultaneously. One of the main objectives of this dissertation is to develop robust multiuser AMC's for CR. It will be shown later that multiple antennas are required at the receiver for classifying multiple signals. The use of …
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ARQ Techniques for MIMO Communication Systems
Multiple-input multiple-output (MIMO) communication systems employ multiple antennas at the transmitter and the receiver. Multiple antennas provide capacity gain and/or robust performance over single antenna communications. Traditional automatic-repeat-request (ARQ) techniques developed for …
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Spreading and power control for multiple antenna transmit diversity
… thesis proposes a new transmission scheme for multiple antenna transmission at the base station of a wireless cellular system. We develop our new scheme in a wideband CDMA framework using multiple phases of Gold codes for spreading on different antennas. We evaluate the performance of this …
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Adaptive antenna systems for mobile broadband communications
… wireless communications is the use of adaptive antennas at the transceivers, along with the associated advanced array signal processing, to improve cell coverage, link quality and system capacity. This dissertation first provides a framework of adaptive antenna systems for wireless …
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Wireless Communications in the Energy -Limited Regime
… in the low-SNR regime. Further, by allowing multiple transmit and receive antennas, we study the impact of multiple antennas on the fundamental tradeoff between communication rate and probability of decoding error. For the case when the fading matrix H has independent entries, we show that …
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A software defined GPS signal simulator design
… is also able to simulate GPS signals for multiple antennas, simultaneously. These features of the simulator will immensely help the security researchers in the GPS community.
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Cooperation in Wireless Networks
Spatial diversity, in the form of employing multiple antennas (i.e., MIMO), has proved to be very effective in increasing network capacity and reliability. However, equipping a wireless node with multiple antennas may not be practical, as the footprint of multiple antennas may not fit on a wireless …
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Maximizing degrees of freedom in wireless networks
… with fading. Both source and destination have multiple antennas. The information reaches the destination through a sequence of layers of single-antenna relays. A non-separation-based strategy is proposed and shown to achieve a rate equal to the capacity of a point-to-point multiantenna system …
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The Impact of Channel Estimation Error on Space-Time Block and Trellis Codes in Flat and Frequency Selective Channels
Recently multiple antenna systems have received significant attention from researchers as a means to improve the energy and spectral efficiency of wireless systems. Among many classes of schemes, Space-Time Block codes (STBC) and Space-Time Trellis codes (STTC) have been the subject of many …
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Finite blocklength analysis of the MISO Coherent Block Fading Channel
… model in which the transmitter has access to multiple antennas while the receiver has access to one. This model is becoming increasingly important in communication networks because a base station is often able to use many antennas whereas smaller receivers, such as mobile devices, have a …
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3D backscatter localization for fine-grained robotics
… time series of the sensed bandwidth across multiple antennas to enable accurate positioning. Our experiments show that TurboTrack simultaneously achieves a median accuracy of sub-centimeter in each of the x/y/z dimensions and a 99th percentile latency less than 7.5 milliseconds in 3D …
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Information theory of transmit diversity and space-time code design
We restate the achievable information rates for multiple transmit multiple receive antenna systems in fast fading channels. Then we consider non-ergodic channel, where we evaluate asymptotic expression for the outage probability and note its striking similarity with the error probability. After …
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Parallel integrated receivers for multiple antenna wireless LAN systems
… area-efficient parallel integrated receivers for multiple antenna wireless LAN systems. These receivers are part of an indoor parallel radio system that achieves 1 gigabit per second data rates and enables high bandwidth wireless communication between portable user devices and a high speed wired …
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