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The printability problem of chip making becomes challenging in advanced process nodes. At present, various lithography technologies such as multiple patterning (MP), directed self-assembly (DSA), electron beam (e-beam), and their combinations are being considered. In this paper, the corresponding layout decomposition problems for contact/via generation are studied. In particular, we investigate the...
In this paper, semi-orthogonal frequency multiplexing (SOFDM) is proposed, which has doubled spectral efficiency over OFDM by halving the subcarrier spacing. SOFDM is orthogonal in real field but non-orthogonal in complex field. To cancel the inter carrier interference caused by non-orthogonality, linear equalization algorithms are introduced based on inter carrier cross-correlation matrix. However...
We use one-way communication delay of a TCP connection to design an MPTCP scheduler that transmits data out-of-order over multiple paths such that their arrival is in-order. Our Linux implementation shows our proposed scheduler can reduce receive buffer utilization, and increase overall throughput when a small receive buffer size results in receive buffer blocking.
We first explain problems with the default scheduler used by the Linux kernel MPTCP implementation. Then we propose the design of a new scheduler. Preliminary empirical results show that our proposed scheduler improves the throughput in MPTCP by alleviating the problems caused by the default scheduler.
This paper proposes a cloud-based architecture for enhancing the performance and capacity of vehicular networks of potentially multiple different wireless technologies. The approach addresses the well-known limitations of today's vehicle-initiated as well as base station-assisted handoff solutions; the former is reactive, therefore slow and inefficient, while the latter is mostly limited to within...
Microsoft's Receive-side scaling (RSS) is a network driver layer technology that enables the efficient distribution of received packets. However, Microsoft's RSS technology is implemented in hardware. In this paper, we implement RSS technology in user-space and apply it in a traffic monitoring system which runs on the DELL R710 multi-core server. We distribute received packets, according to certain...
In this paper, we study transmission policies for opportunistic spectrum access over multiple Rayleigh fading channels. We formulate the opportunistic spectrum access problem as a joint channel access and power control problem with the objective that maximizes expectation sum of throughput under the constraint of limited battery capacity over finite time slots. In this problem, we consider the transmission...
HTTP is the most popular application-layer protocol in the Internet. Improving the performance of HTTP packets reassembly is the key point of HTTP traffic analysis. In this paper, we first parallel the traditional serial HTTP packets reassembly system according to the HTTP protocol features. This optimization improves the throughput of packets reassembly system by 45% on the generic multi-core platform...
The IEEE 802.16 mesh network is a promising next generation wireless backbone network. Under Coordinated Distributed Scheduling (CDS) mode, setting the holdoff time for nodes is essential to achieving good performances of medium access control layer scheduling in the networks. In this paper, we propose a dynamic scheme for setting holdoff time in IEEE 802.16 mesh mode with CDS. This scheme allows...
The IEEE 802.16 standard, also known as WiMAX, provides a mechanism to create a multi-hop mesh network. In order to improve the performance, multi-channel transmission can be adopted, however, a heavy scheduling scheme will affect network performance. This paper proposes a novel algorithm, called Layered Critical Path (LCP), which is a channel assignment scheme in a multi-channel single-transceiver...
Switch fabrics supporting differentiated QoS in high-performance routers have the issues of centralized scheduling, feedback and complex architecture. To address these issues, we design a novel switch fabric supporting differentiated QoS called Weighted-Layer-Assignment Parallel Packet Switch (WLA-PPS). WLA-PPS assigns different switch layers to packet-flows of different QoS types based on weight...
In most wireless relay networks, the source and relay nodes transmit successively via fixed time division (FTD) and each relay forwards a packet immediately upon receiving. In this paper we enable the buffering capability of relay nodes and propose a framework for joint scheduling and relay selection. The goal is to maximize the system long-term throughput by fully exploiting multi-user diversity...
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