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Parallel Turbo decoding encounters conflicts during parallel data accesses because of the sequential data interleaving, and the conflicts lead to a serious decrease of throughput. Traditional conflict-free memory mapping schemes often require a huge cost of hardware, such as the area of memory, which is also a bottleneck in practical implementations. In this work, DSATUR (Degree of Saturation) coloring...
The giant and growing data traffic from mobile service makes it drastically increase the burden for the cellular network operator to guarantee the peak traffic demand. A potential solution to increase the network capacity while saving energy is to offload part of the traffic through femtocells. In this paper, we propose a reverse auction based on Vickrey-Clarke-Grove (VCG) mechanism in the heterogeneous...
IEEE 802.11 standard leaves client to determine AP association selection and initiate AP handoff. This often leads to sub-optimal results in enterprise WLAN with a large number of users. Therefore, network operators expects the ability to dominate AP association selection and AP handoff initiation so that better AP/client association can be achieved. In addition, AP handoff procedure involves time-consuming...
Satellite communication with its world-wide coverage has now become an indispensable part of the Aeronautical communication. Support for high-speed Internet access by the new generation satellite systems has made the provision of IP-based multimedia applications on-board the aircraft possible at all times. Considering the expensive nature of satellite resources, IP multicast can provide a cost-effective...
This paper addresses the application of coalitional game theory to cooperative broadcast networks with simultaneous wireless information and power transfer (SWIPT). To improve the reception reliability of destinations with poor channel conditions, we first divide destinations in the network into two types. The first type, Type I, refers to the destinations with the capability of successful decoding...
Energy harvesting (EH) has recently emerged as a promising technology for next-generation green wireless networks, as it can power communication nodes with renewable energy. However, it is challenging to provide satisfactory performance in such systems, due to the sporadic energy arrival and the low harvesting rate. In this paper, we propose a novel cooperation strategy for EH networks with the help...
This paper presents the novel design and implementation of our 2 ×2 full duplex MIMO radios for LTE system. Our design first uses multi-tap analog cancellation to reduce self-interference in RF domain. 4 multi-tap cancellers are used respectively for the 4 self-interference chains existed in a radio. RF power detectors and ADCs are introduced to indicate the residual self-interference power arriving...
This paper investigates simultaneous wireless information and power transfer (SWIPT) in a multi-antenna relay network. We consider robust transmit power minimization problem at the relay by jointly optimizing beamforming and adaptive power splitting subject to the signal-to-inference-plus-noise (SINR) and energy harvesting constraints by incorporating channel uncertainty model. We formulate the original...
Mobile Network Operators around the world are improving their 3G/UMTS (Third Generation/Universal Mobile Telecommunication System) network by introducing DC-HSPA+ (Dual-Carrier Evolved High Speed Packet Access). However, it has remained unclear how well the current networks fulfill the commitments of performance guarantee of OTT (over-the-top) services. In this paper, a field test platform called...
3D reconstruction from multiple-view images has drawn a lot of attentions in computer graphics and computer vision communities. Traditional techniques usually end at discrete 3D point clouds computed from feature correspondence. However, geometric structure remains ambiguous in these unstructured point clouds, especially for man-made objects like buildings, indoor scenes. This paper proposes a new...
Along with the continuous renewal and upgrade of the network storage system, the user has higher and higher demands for the secure and efficient data soft destruction. However, existing methods of data soft destruction usually bring too much destruction overheads. Even more, they are easy to recover, or not flexible enough. In order to achieve the target of destroying data effectively, we propose...
Wireless sensor networks monitor specific areas through periodical data collecting mechanism, where sensor nodes sense information and forward data to Sink via multi-hop wireless communications. Since the timeliness of collecting data is of great importance to many applications, a low-latency data collection network structure (LDCNS) which minimizes delays in a data collection process is proposed...
Contention-based MAC protocols are adaptive to network changes but are inefficient due to frame collisions. On the other hand, reservation-based MAC protocols have advantage of collisions-free transmissions but lack flexibility. In this paper, we propose a novel hybrid contention/reservation-based MAC protocol in WLANs, called IO-MAC, which allows the coexistence of variable reservation period and...
Compressed sensing (CS) is a technique that enables signal reconstruction at sub-Nyquist rate and has been widely used for fast reconstruction of multi-view video sequences (MVS) in the surveillance application. In this paper, we propose compressed-sensing recovery of MVS exploiting the model of structural group sparse representation (SGSR) along with a targeted database. SGSR groups similar patches...
A doubly-generalized low-density parity-check (D-GLDPC) code is a low-density parity-check (LDPC) code, where both of the check nodes and variable nodes use linear block codes instead of repetition and single parity-check (SPC) codes. In this paper, we propose a class of D-GLDPC codes in which 3-dimensional (3-D) single parity-check product-codes (SPC-PCs) are used as super-check nodes (SCNs). We...
Energy harvesting and physical-layer security in wireless networks are of great significance. In this paper, we study the simultaneous wireless information and power transfer (SWIPT) in downlink orthogonal frequency-division multiple access (OFDMA) systems, where each user applies power splitting to coordinate the energy harvesting and information decoding processes while secrecy information requirement...
In this paper, we investigate the energy efficiency maximization problem of analog network coding (ANC) based two-way relay (TWR) assisted cellular network under quality of service (QoS) constraints through transmit power optimization. Circuit power cannot be ignored since it influences energy efficiency greatly. However, the difficulty is that maximizing energy efficiency is shown to be non-convex...
This paper investigates energy efficient resource allocation for orthogonal frequency division multiplexing (OFDM) multi-relay networks, where the source node communicates with the destination node via multiple relay nodes. Both transmit power and circuit power consumption are taken into consideration. The objective is to minimize the overall power consumption so as to achieve high energy efficiency...
IEEE 802.11 based wireless local area networks (WLANs) have widespread deployment in a variety of settings in recent years. To improve the utilization of the networks, the problem of user association has been studied extensively that attempts to achieve load balance among APs. To quantify the traffic load conditions, different performance metrics have been adopted. In this paper, we focus on the unsaturated...
Visible light communication (VLC) has been considered as a promising technique for broadband wireless access. In this paper, we propose and experimentally demonstrate a novel high-speed LED based VLC local area network to provide beyond 10Gb/s optical wireless access for massive users based on star topology architecture. Fiber link is used as the bidirectional transmission backbone of the VLC network...
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