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Energy efficiency is of utmost importance for wireless networks due to the prevalent usage of mobile devices in WLAN and wireless sensor networks (WSNs). Consequently, duty cycling MAC protocols are widely employed in both WLAN (i.e., power saving mode - PSM) and WSNs (i.e., low power listening - LPL)). In a coexisting PSM and LPL network, a significant energy efficiency degradation has been observed...
Coexisting 802.11 and 802.15.4 single-cell wireless networks are experiencing significant performance degradation due to the aggressive nature of 802.11 (when compared to 802.15.4) and to their different traffic characteristics [1]. Providing tight delay guarantees to certain 802.15.4 applications (e.g., health monitoring with unsaturated, periodic traffic) is becoming increasingly infeasible, in...
Energy efficiency is a significant aspect in wireless LANs due to the pervasive usage of mobile devices. The most effective way to save energy is turning off the radio, which is the key feature of the IEEE 802.11 power saving mode (PSM) protocol. Understanding the performance such as throughput and energy consumption of 802.11 PSM networks is important because they depend highly on the parameters...
With the integration of cores increasing, the on-chip-network (NoC) latency and the throughput are getting worse in traditional structures. This paper proposed a novel parameter-based on the hierarchical mesh interconnected NoC (PHMNoC) to improve the integration and performance. We use structural parameters and cross-layer threshold parameter to achieve scalability for different system size and balance...
This paper investigates the compress-and-forward scheme for an uplink cloud radio access network (C-RAN) model, where multi-antenna base-stations (BSs) are connected to a cloudcomputing based central processor (CP) via capacity-limited fronthaul links. The BSs perform Wyner-Ziv coding to compress and send the received signals to the CP; the CP performs either joint decoding of both the quantization...
This paper studies the optimization of transmit beamforming and backhaul compression strategies for the uplink of cloud radio access networks (C-RAN), in which multi-antenna user terminals communicate with a cloud-computing based central processor (CP) through multi-antenna base-stations (BSs) serving as relay nodes. The BSs perform compress-and-forward strategy to quantize the received signals and...
This paper investigates an uplink multi-cell processing (MCP) model where the cell sites are linked to a central processor (CP) via noiseless backhaul links with limited capacity. A simple compress-and-forward scheme is employed, where the base-stations (BSs) quantize the received signals and send the quantized signals to the CP using distributed Wyner-Ziv compression. The CP decodes the quantization...
This paper studies single-user compression for the uplink multi-cell processing (MCP) model where multiple base-stations are connected to a central processor via noiseless backhaul links with a sum capacity constraint. The proposed scheme is based on the virtual multiple-access channel (V-MAC) architecture, where the base-stations quantize the received signals and send the quantized bits to the central...
One of the major challenges in deploying femtocells is the management of interference between neighboring femtocells and between the femtocells and the macrocells. This paper explores the use of opportunistic multiuser detection for interference mitigation in the downlink of an orthogonal frequency division multiple access (OFDMA) femtocell network. In particular, we focus on the use of joint decoding...
A joint watermarking and compression (JWC) paradigm is considered for the application of JPEG image compression to achieve an efficient tradeoff among the embedding rate, compression rate, embedding distortion, and robustness against a class of “natural” signal processing attacks, including spatial filtering, image resizing and rotation, random row and column deleting, and JPEG2000 recompression....
In this paper we are interested in the design of joint watermarking and compression (JWC) systems to obtain an efficient tradeoff among the embedding rate, composite rate, encoding distortion, and robustness. Using variable-rate scalar quantization (VRSQ) for watermarking and compression, we first present an optimum binary JWC encoding algorithm to maximize the robustness of the systems in the presence...
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