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Wireless channels create both intersymbol interference (ISI) and interchannel interference (ICI) on the transmitted signal. The OFDM-OQAM system with well localized prototype filter can reduce the interference caused due to the transmission over wireless channel, but it is not the optimal choice. In this paper, we propose a new structure for OFDM-OQAM system with hexagonal time-frequency lattice which...
New wireless subscribers are signing up at an increasing demand of more capacity for ultra-high data rate transfers at speeds more than 1 Gbps, while the radio spectrum is limited. Millimeter wave communication system offers a unique way to resolve these problems. In this paper, the performance of a full duplex transportation system is reported for 1.5 Km of multi-mode fiber length for a sample 10...
In this article, an ultra-high-speed multiply-accumulate (MAC) structure is proposed. This fused MAC block uses low-voltage-swing (LVS) technique in the utilized carry-save adders and the final adder to improve its speed. Carry-save adders and the final adder are implemented with pass-transistor-based Manchester-carry-chain logic. Sense amplifiers are used in the output nodes to amplify the LVS signals...
Ultra-wideband (UWB) impulse radio with its recent definition by the FCC is a promising technology for low-cost, high-rate communications at short ranges. However, high bandwidth and low power of the UWB signals impose some difficult challenges which demand for optimal tradeoffs between complexity and performance. In this paper, we investigate the design issues related to the baseband section of a...
Ultra-wideband (UWB) radio is a promising technology which enables high-rate, low-cost communications at short ranges. One of the most important challenges in the design of UWB systems is timing acquisition in terms of speed, accuracy, and complexity. Fine time resolution of UWB signal introduces a large search space. Also, due to the very low power of the received signal, it needs to be observed...
DAB is a growing communication technology for digital audio broadcasting and demands higher concentration on flexible and cost optimum implementations for use in new mobile electrical appliances. In the other hand, new low cost FPGAs and their fast time-to-market cycle in comparison to ASIC implementations make them widely applicable to communication industry. The focus of this paper is on MATLAB...
As the multimedia applications such as voice and video streaming across the Internet emerge, there is a growing demand for quality of service (QoS) over different networks. Among different Internet-based networks, 802.11 wireless local area networks (WLAN) are among the most important. Two significant factors that affect multimedia quality over a wireless network are the packet loss and delay. While...
Most high precision sigma delta DACs use SINC filters to provide large stop-band attenuation. They have the highest operating frequency in comparison to other stages and therefore consume most of the power in an interpolation filter. This paper presents a proper method for reducing the power consumption of a SINC filter. Multistage SINC filters with different stage orders can reduce the power consumption...
In this article, the performance and power dissipation of two differential logic circuits in deep sub-micron technologies are obtained and compared together, and the superior topology is introduced. Low voltage swing (LVS) technique which improves circuit performance and lowers power consumption is described in detail. We conclude this article with the design, simulation and optimization of a high...
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