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 23 for “"Multiple Access Channel"”.
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Dynamic subframe allocation in a reservation multiple access channel
Multiaccess protocols allow multiple geographically diverse users to communicate with a central station or each other over a single broadcast channel. Reservation protocols are a class of multiaccess protocols appropriate for satellite and radio networks. This thesis investigates dynamic time slot …
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Dynamic sensing and signaling over the packet radio network multiple access channel
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1987
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Fair resource allocation in multiple access channels
… consider the problem of resource allocation in a multiple access channel. Our objective is to obtain rate and power allocation policies that maximize a general concave utility function of average transmission rates over the information theoretic capacity region of the multiple-access channel. We …
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Coding theorems of quantum information theory
… converses for memoryless quantum communication channels and quantum sources are proved: for the quantum source the coding theorem is reviewed, and the strong converse proven. For classical information transmission via quantum channels we give a new proof of the coding theorem, and prove the …
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Zero-error communication over adder MAC
Adder MAC is a simple noiseless multiple-access channel (MAC), where if users send messages X₁, . . . ,X[subscript h] [epsilon] {0, 1}[superscript n], then the receiver receives Y = X₁ + · · · + X[subscript h] with addition over Z. Communication over the noiseless adder MAC has been studied for …
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Super-quantum and quantum enhancements of two-sender channels
… capacity of classical communication over a noisy channel. Our results exhibit a trifecta of proof-of-concept channels: first, we show an interference channel between two sender-receiver pairs where the senders are not allowed to communicate, for which a shared super-quantum bit allows perfect …
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Impact of processing energy on the capacity of wireless channels
… single user Additive White Gaussian Noise (AWGN) channel in the presence of processing energy. We prove that, unlike the case where only transmission energy is taken into account, achieving capacity may require intermittent, or 'bursty', transmission. We show that in the low Signal to Noise Ratio …
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Power and delay trade-offs in fading channels
… networks, communication takes place over fading channels. By varying the transmission rate and power based on the current fading level, a user in a wireless network can more efficiently utilize the available energy. For a given average transmission rate, information theoretic arguments provide …
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Non-orthogonal multiple access using guessing random additive noise decoding aided macrosymbols
… macrosymbols (GRANDAM) as a nonorthogonal multiple access (NOMA) method that can detect, error correct, and decode multiple users in multiple input multiple output (MIMO) systems that involve imperfect channel estimation, symbol-wise asynchronous transmission, and interference. GRAND-AM is …
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Complexity and second moment of the mathematical theory of communication
… to zero, whether their code rates converge to channel capacity, and whether their growth in complexities stays under control. Over any discrete memoryless channel, I build codes such that: for one, their block error probabilities and code rates scale like random codes’; and for two, their …
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Asymptotic analysis for multi-user channels
… studies the asymptotics of two multi-user channel problems. The fingerprinting channel is associated with digital fingerprinting, which is an emerging technology to protect multimedia from unauthorized redistribution. The encoder embeds fingerprints into a host sequence and provides the …
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Spatially Coupled Sparse Regression Codes for Single- and Multi-user Communications
Sparse regression codes (SPARCs) are a class of channel codes for efficient communication over the single-user additive white Gaussian noise (AWGN) channel at rates approaching the channel capacity. In a standard SPARC, codewords are sparse linear combinations of columns of an i.i.d. Gaussian …
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Multi-layer Optimization Aspects of Deep Learning and MIMO-based Communication Systems
… addresses multi-layer optimization aspects of multiple input multiple output (MIMO) and deep learning-based communication systems. The initial focus is on the rate optimization for multi-user MIMO (MU-MIMO) configurations; specifically, multiple access channel (MAC) and interference channel …
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Information Theoretic Limits of State-dependent Networks
… study the two-user state-dependent Gaussian multiple access channel (MAC) with a helper. The channel is corrupted by an additive Gaussian state sequence known to neither the transmitters nor the receiver, but to a helper noncausally, which assists state cancellation at the receiver. Inner and …
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Ultra-wideband technology for short-range wireless communication
… white Gaussian noise (AWGN) and multipath channels. Starting from the known capacity of M-ary modulated signals, the computation of UWB capacity over the AWGN channel takes into account UWB specific constraints. The constraints are the power spectrum density limitation under Federal …
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On the MIMO Capacity with Multiple Power Constraints
Themultiple-inputmultiple-output(MIMO)technology has become an essential element of modern communication systems e.g.,3G,4 Gand massive MIMOtechnology has been recently standardized i n3GPPRel-15i.e. ,New Radio(NR)to enhance the spectral efficiency or the capacity of 5G networks. Given a digital …
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Spatial Coupling for High-Dimensional Estimation
… to design an efficient decoder for the Gaussian multiple access channel with random user activity, in the regime where the number of users is proportional to the code length. We provide asymptotic guarantees of the error performance of the decoder and demonstrate that it outperforms the i.i.d. …
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Two–Way Relaying Communications with OFDM and BICM/BICM-ID
… from detection quality degradation caused by the multiple-access interference (MAI). In addition, because of the propagation characteristics of wireless channels, fading and multipath dispersion also contribute strongly to detection errors. Therefore, this thesis is mainly concerned with designing …
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Multiple access networks over finite fields : optimality of separation, randomness and linearity
We consider a time-slotted multiple access noisy as well as noise-free channel in which the received, transmit and noise alphabets belong to a finite field. We show that source-channel separation holds when the additive noise is independent of inputs. However, for input-dependent noise, separation …
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Message Passing Algorithms for Statistical Estimation and Communication
… sketching, and communication over many-user channels. Efficient recovery schemes, based on belief propagation (BP) and Approximate Message Passing (AMP), are developed for these problems. We first consider matrix sketching, where the goal is to recover an *n*<sub>1</sub> x *n*<sub>2</sub> …
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