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The extended Kalman filtering algorithm applied for carrier synchronization and the implementation are studied in this paper. The major advantage of the Kalman-based scheme over the conventional phase-locked loop (PLL) is the self-adaptation of loop bandwidth for better compromising the tradeoff between fast acquisition and small phase tracking variation. We have developed the idea to a practical...
In this paper a novel pre-computation technique for scalar point multiplication on elliptic curves is proposed. Compared to standard affine coordinates without pre-computation this method achieves a performance increase of 23% while requiring an additional increase in control and logic for the pre-computation step. This method achieves a (2m bits times numpoints) reduction in storage overhead compared...
Modular multiplication in Galois Fields - GF(p) and GF(2m ) is an ineluctable and time stumbling block in public key cryptosystems. Montgomery modular multiplication has emerged as a VLSI efficient implementation of this operation. In this paper, a new scalable and pipelined Montgomery multiplier architecture that unifies the two important finite fields, GF(p) and GF(2m), is presented. The proposed...
OFDM system is sensitive to CFO (carriers frequency offset) which is divided into fractional part and integer part. In usually, estimation of integer CFO needs to store one OFDM symbol. However, the maximum length of FFT in DVB-T is 8192, so it requires a lot of storage units. In this paper, we propose a memory reduction algorithm for integer CFO estimation used in DVB-T. This memory reduction algorithm...
In this paper we propose an approach of providing the best power-delay tradeoff for combinational circuits. This is done by so-called power-oriented delay budgeting which is to combine the delay-budgeting technique with aggressive power optimization. We discuss the impacts that both discrete cell library and circuit topology may have on the potential power reduction. Experimental results show that...
To handle the mismatch problems of spatial-domain motion aligned temporal filtering (MATF) in providing spatial scalability, this paper presents a novel in-scale motion aligned temporal filtering (ISMATF) for highly scalable video coding. For each lifting step of ISMATF, the predict or update is carried out at various resolutions in a scale-by-scale way and the operation at higher resolution is designed...
In this paper, a realization scheme that combines the singular-value decomposition (SVD) and the generalized polyphase (GP) structure is proposed for 2D linear-phase FIR filters. With a small number of extra additions, a high-order 2D FIR filter is converted to several lower-order 2D subfilters. These subfilters are then realized using the SVD, yielding a parallel implementation structure for each...
In this paper we present an ultra-low voltage gate-input operational transconductance amplifier using pMOS input devices and nMOS load devices with local common-mode feedback. This topology has a good intrinsic common-mode rejection. Simulations for a two-stage, 0.5 V fully differential operational transconductance amplifier (OTA) with a gain of 55 dB and a common-mode rejection ratio of 61 dB are...
Traditional statistical analysis and mining of network data are often employed to determine traffic distribution, to summarize a user's behavior patterns, or to predict future network traffic. We analyze three months of network log data from a deployed public safety trunked radio network. After data cleaning and traffic extraction, we apply the K-means algorithm and identify that three clusters of...
According to the well known Barkhausen criteria, an oscillator requires a loop gain of greater than 1 to start up. In order to ensure start-up, the literature invariably advises a gain value of around 3. However, no valid argument exists to support this figure. This work demonstrates that this figure, in the case of the voltage-biased differential LC CMOS oscillator, may have some physical significance...
The problem of traffic congestion in complex networks is studied. Two kinds of complex network structures, namely random graphs and scale-free networks, are considered. In terms of the structure of connection, random graphs are homogeneous networks whereas the scale-free networks are heterogeneous networks. For both types of networks, we introduce an additional scale-free feature in the load generation...
In this paper, the scalable architecture of the embedded block coding (EBC) in JPEG 2000, the bit-plane parallel EBC, is proposed. We provided the analysis and an unified design methodology for the bit-plane parallel EBC architecture. To design the bit-plane parallel EBC, there exists three critical difficulties. To overcome the difficulties, three algorithms are proposed. By use of the proposed algorithms,...
In the design of a packet-oriented impulse-radio UWB communication system, the main challenge at the receiver is to have a fast synchronization to the coded pulses, along with a detection of the message. We consider schemes that are straightforward to implement in practical systems and propose two methods to realize the synchronization algorithms: a serial and a parallel method. The algorithms for...
Ultra wideband radio is an emerging wireless standard that uses sub-nanosecond pulses to transmit data, resulting in several GHz bandwidths. The problem of generating a synchronized template respect to the received signal grows in complexity as the signal bandwidth increases. In this paper, innovative, low cost, non-coherent receiver architecture is proposed for autonomous detection of ultra wideband...
The proliferation of multiple WLANs and the continuous scaling of CMOS have created the need for low-voltage multistandard WLAN receivers. Instead of approaching a complicated SoC, a 3D-stack SiP appears as a promising alternative to meet those requirements in conjunction with the obvious goals of low power and low cost. This paper, focused on the SiP implementation of a WLAN receiver, presents the...
Few watermarking systems are designed to resolve the problem of joint ownership verification. This paper proposes a new watermarking system for proving joint ownership of digital images, where a TTP is needed. The watermarking key is shared by all co-owners using Shamir's secret sharing scheme as presented by Shamir (1979). Furthermore, each owner is distributed a detection watermark for individual...
In this paper we analyze the distortion due to self-mixing of TX (transmitter) interference in WCDMA mobile receivers. The self-mixing is primarily due to the second order nonlinearity of the mixer, which is very significant in WCDMA receivers due to the high power of TX interference. Existing published work has analyzed the dependence of distortion on TX interference power and second order nonlinearity...
This paper proposes a minimum-width multi-row transistor placement method for CMOS cells in presence of non-dual P and N type transistors. This is the first exact multi-row transistor placement method which can be applied to CMOS cells with any types of structure. Non-dual CMOS cells occupy a major part of an industrial standard-cell library. To generate the exact minimum-width transistor placement...
In this paper, we present a new algorithm of the four-stage buffer planning to improve success rates of buffer insertion and wiring congestion. It is based on the space reservation, which reserves enough dead space between all adjacent blocks. First of all, we perform the space reservation between all adjacent blocks of an initial floorplan. Second, the shortest path graph is used to select the routing...
This paper presents an OFDM transceiver for wireless LAN systems and its baseband transceiver architecture. We study the optimum parameters about DFT size, guard interval, symbol duration, and number of subcarriers in an 80-MHz bandwidth by extending the IEEE 802.11a standard. The proposed transceiver has a maximum 300-Mbps transmit rate and achieves 600 Mbps by use of a 4times2 MIMO system. We have...
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