基于JTAG技术的Flash加载

主要介绍了目前世界上主要流行的一种Flash加载技术——利用JTAG技术加载Flash。文章分为3个部分。首先描述了JTAG加载Flash的原理。然后对JTAG加载Flash的优点做了说明。最后对实验性能做了详细分析。     

An optimization technique for simultaneous reduction of PAPR and out-of-band power in NC-OFDM-based cognitive radio systems

Noncontiguous orthogonal frequency division multiplexing (NC-OFDM)-based cognitive radio (CR) systems achieve highly efficient spectrum utilization by transmitting unlicensed users' data on subcarriers of licensed users’ data when they are free. However, there are two disadvantages to the NC-OFDM system: out-of-band power (OBP) and a high peak-to-average power ratio (PAPR). OBP arises due to side lobes of an NC-OFDM signal in the frequency domain, and it interferes with the spectrum for unlicensed users. A high PAPR occurs due to the inverse fast Fourier transform (IFFT) block used in an NC-OFDM system, and it induces nonlinear effects in power amplifiers. In this study, we propose an algorithm called “Alternative Projections onto Convex and Non-Convex Sets” that reduces the OBP and PAPR simultaneously. The alternate projections are performed onto these sets to form an iteration, and it converges to the specified limits of in-band-power, peak amplitude, and OBP. Furthermore, simulations show that the bit error rate performance is not degraded while reducing OBP and PAPR.     

基于JTAG标准的高速板上编程器设计

介绍了板上编程（OBP）技术的基本原理。在实现上,以Atmel的高性能AVR单片机ATmega16L为核心。通过Philips的USB1.1控制芯片PDIUSBD12和上位机高速传输编程数据,同时,将组织好的数据并行发送给Altera的EPM240,由其产生JTAG时序,通过TAP（Test Access Port）与边界扫描（Boundry-Scan）技术,控制目标系统上微处理器引脚信号,最后完成与数据总线相连的FLASH存储器编程。     

Integration of Terrestrial and Satellite Networks: Technology,Services and Applications

In support of the growing demand for multimedia information services andseamless nomadic roaming, networks of the future must be increasingly flexible and resource efficient. However, current networking protocols must be enhanced for use in satellite, as wellas, wireless networks. In this paper, issues and trends with respect to the integration of future satellite and terrestrial networks will be examined.