This paper describes a capacity analysis tool developed to quickly screen potential wafer profiles for a multi-technology, multi-part number, IBM Microelectronics semiconductor fabricator. This tool ...identifies constraints and opportunities within the fabricator, as well as capacity shortages of key tool sets for a given wafer load. Quicker capacity analysis was demanded not only by a more dynamic market, but also by new strategies to exclusively manufacture logic and pursue OEM market opportunities.
Controller area network (CAN) is an in-vehicle communication network system. Many microcontrollers are built in vehicles that transmit and receive the data through CAN bus. As more microcontrollers ...are built in the car, the amount of data to be processed are increased. However, it is insufficient to process the increasing data because the maximum data rate of the standard CAN is 1Mbps. Therefore, we recently proposed a high data rate CAN system which combines the standard baseband CAN signal with a passband modulated signal. Before designing this system, the channel capacity analysis is needed to estimate the performance of the proposed scheme. This paper introduces the channel capacity analysis of the proposed scheme. In order to get the signal to noise power ratio (SNR) that is needed for capacity analysis, the standard baseband CAN noise is measured in a real car. Based on the SNR, water-filling algorithm is then employed for power allocation in the frequency domain, resulting in the channel capacity.
It is quite important for Device-to-Device (D2D) communication to make decision in selecting which part of the celluar radio resource, namely uplink (UL) resource or downlink (DL) resource, to be ...reused for the purpose of higher system capacity. In this paper, we propose an interference control scheme in DL mode to limit the base station's (BS) interference to D2D user equipments (DUEs) by selecting cellular user equipments (CUEs) nearer to BS. By comparing the interference control scheme used in UL situation, we derived the two lower bounds of ergodic capacity of reusing UL and DL resource in D2D communication. Numeric results show that the system capacity can be optimized by utilizing effective reusing mode selection strategies.
A Practical Method to Determine Achievable Rates for Secure Steganography Lingyu Zhang; Diao Chen; Yun Cao ...
2015 IEEE 17th International Conference on High Performance Computing and Communications, 2015 IEEE 7th International Symposium on Cyberspace Safety and Security, and 2015 IEEE 12th International Conference on Embedded Software and Systems,
08/2015
Conference Proceeding
With a chosen steganographic method and a cover image, the steganographer always hesitates about how many bits should be embedded. Though there have been works on theoretical capacity analysis, it is ...still difficult to apply them in practice. In this paper, we propose a practical method to determine the appropriate hiding rate of a cover image with the purpose of evading possible statistical detections. The core of this method is a non-linear regression, which is used to learn the mapping between the detection rate and the estimated rate with respect to a specific steganographic method. In order to deal with images with different visual contents, multiple regression functions are trained based on image groups with different texture complexity levels. To demonstrate the effectiveness of the proposed method, estimators are constructed for selected steganographic algorithms for both spatial and JPEG transform domains.
In this paper, we present a normative study that describes the impact of discharging decisions in the face of resource shortages. We develop a model that represents the dynamics of a health care ...unit. Then, to capture the essence of discharge decisions, we consider discharge policies that incorporate both the occupancy level of the unit and the status of patients measured by their stage of recovery and the time they have spent in that stage. We believe that our model can be used as an aid to physicians and administrators to better assess discharge and/or capacity decisions. In addition, we investigate the impact of discharge decisions on the measures that represent the quality of care at a facility such as average hospital stays, system accessibility, and average complication risk of discharged patients. Our findings illustrate that inclusion of early discharge option improves system accessibility significantly and does not jeopardize care equity among patients. Furthermore, introduction of early discharge option has more pronounced effects on increasing care unit capacity than addition of open beds with no early discharges.
With the widespread deployment of LTE 4G systems and large number of connected devices due to the Internet of Things, M2M services using LTE is under consideration by many cellular operators. In LTE ...Rel-12, low cost M2M devices with material cost comparable to EGPRS devices are being introduced. In addition, coverage enhancement techniques, which would be required to support M2M, will be standardized in Rel-13. In this paper, we will present an overview of M2M communication using LTE. We will cover the basics of LTE and show that LTE can be used to efficiently serve human and machine traffic. In addition, capacity results for some representative M2M services will be provided and their impact on human traffic will be discussed. Finally, M2M analysis using a real-world deployment scenario will be presented.
In this paper, we study a water-filling power allocation scheme in large M × N MIMO systems over flat Rayleigh fading channels. It is shown that when M = N with sufficiently large M, the channel ...capacity of the water-filling scheme almost converges to a constant regardless of channel randomness. Moreover, it is proved that for the water-filling scheme, the required channel information at the transmitter in large MIMO systems can be greatly reduced without capacity loss. When M ≫ N or M ≪ N, it is shown that allocating equal power on each eigenchannel is almost as optimal as water-filling power allocation scheme in channel capacity.
Data acquisition systems play an important role in several industries. Because highly scalable ad-hoc networks with multi-hop transmissions can be easily constructed at low cost, such networks are ...considered suitable for data acquisition systems. However, a lack of centralized control makes it difficult to respond to congestion when system capacity is exceeded. Therefore, the estimation of system capacity is a critical issue for system design. In this paper, we propose a novel zone division model to analyze the capacity of multi-hop data acquisition systems using Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocols. We divide the one-hop area to a gateway (GW) into two zones: (1) an outer zone where an access node (AN) can relay packets from multi-hop ANs; and (2) an inner zone where ANs cannot relay packets. Using this approach, we calculate packet loss for each zone, considering the difference in the communication range of the GW and ANs, as well as the collision with hidden nodes. Simulation results show that our model achieves higher estimation accuracy than conventional methods, indicating that we have successfully modeled phenomena of the real system more accurately.
The investments in indoor mobile networks are highly related to the spectrum availability and its associated authorization options. The aim of this paper is to discuss the differences in the spectrum ...demand taking into consideration both wide and local area network deployment requirements and the kind of actor that provides the indoor wireless access. The analysis covers different authorizations options namely licensed, unlicensed, licensed shared access (LSA) and secondary access. A quantitative approach is used to analyze the differences between macrocell and femtocell deployments focusing on deployment cost and spectrum demand. This is complemented by a qualitative study to explore and discuss the strategic business decisions of different actors in view of the available spectrum bands and spectrum authorization options. The main conclusions from this study are; spectrum has more value in macrocell deployment scenarios than in femtocell ones. More spectrum in macrocell deployment scenarios means that operators can deploy less number of new sites and exploit previous infrastructure investments. Femtocell networks are often coverage limited which allows for frequency re-use. As a consequence, the value of spectrum is not the same for mobile network operators (MNOs) and for local network operator (LNOs). MNOs are traditionally confined to macrocell deployment strategies which entail the exclusive usage of licensed bands. While, the use of licensed spectrum by LNOs may incur more cost than the cost of infrastructure deployment. This explains why the use of unlicensed bands is lucrative and viable for LNOs. Furthermore, the LSA scheme may or could soon become an enabler for LNO's business due to the prevailing technical, regulation and policies developments.
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