未来10大高风险高回报的新技术

世界经济论坛全球事务理事会发布了一份关于信息技术的新报告,其中提到了10项有可能对全社会造成重大影响的新技术。这10项新技术涵盖了科学、医学、能源、制造、交通和电子等众多领域,理事会的报告简要说明了那些新技术将如何影响和改变我们的生活。

自动驾驶汽车之路

曾经,自动驾驶汽车(也叫自主驾驶汽车)只出现在科幻小说中。但随着技术的发展,它越来越走向现实。早在2012年,电气和电子工程师协会(Institute of Electrical and Electronics Engineers,IEEE)就预言,到2040年,公路上行驶的汽车中就会有超过75%是自动驾驶汽车。事实上,汽车制造商、技术提供商和世界各地运输当局都越来越多把自动驾驶汽车看作是更加安全、更少拥堵以及更高能源效率的道路系统的关键。

Energy efficiency enhancement of two-way amplifier forward relaying with channel estimation error

In order to save energy consumption of two-way amplifier forward(AF) relaying with channel estimation error, an energy efficiency enhancement scheme is proposed in this work. Firstly, through the analysis of two-way AF relaying mode with channel estimation error, the resultant instantaneous SNRs at end nodes is obtained. Then, by using a high SNR approximation, outage possibility is acquired and its simple closed-form expression is represented. Specially, for using the energy resource more efficiently, a low-complexity power allocation and transmission mode selection policy is proposed to enhance the energy efficiency of two-way AF relay system. Finally, relay priority region is identified in which cooperative diversity energy gain can be achieved. The computer simulations are presented to verify our analytical results, indicating that the proposed policy outperforms direct transmission by an energy gain of 3 dB at the relative channel estimation error less than 0.001. The results also show that the two-way AF relaying transmission loses the two-way AF relaying transmission loses its superiority to direct transmission in terms of energy efficiency when channel estimation error reaches 0.03.

Invited Paper: Antenna Selection in Energy Efficient MIMO Systems: A Survey

With the explosive growth and need for high-speed wireless communications, more and more energy is consumed to support the required quality of service. Therefore, energy efficient or green communication has become a very hot topic under the ground of limited energy resource and environmentally friendly transmission schemes. MIMO technique is capable of reducing the transmission power thanks to its diversity and multiplexing gain. Moreover, antenna selection(AS) is an alternative to extract many of the benefits in MIMO systems with a reduced cost of complexity and power. Although many works including several survey papers have investigated AS in MIMO systems, the goal of these works is only the capacity maximization or error rate minimization, which fails to guarantee the optimality of the energy efficiency in MIMO systems. In this paper, we overview the state of the art in the AS schemes in energy efficient MIMO systems, the goal of which is to optimize the energy efficiency of the whole system. Specifically, we introduce energy efficient AS in point-to-point MIMO, cooperative MIMO, multiuser MIMO and largescale MIMO systems, respectively. Several challenging and practical issues in this area are also addressed.

A Novel Energy Efficient MAC Protocol for Wireless Body Area Network

Wireless Body Area Network(WBAN) is the most promising technology in e-health applications.Energy efficiency stands out as the paramount issue for WBAN.In this paper,an energy efficient MAC protocol named Quasi-Sleep-Preempt-Supported(QSPS) is proposed.The protocol is mainly TDMA-based:nodes transmit packets in the allocated slots,while entering the Q-Sleep mode in other slots.Moreover,for a node with emergency packet,it can broadcast a special designed Awakening Message to wake up the whole network and preempts the right to use the current slot to transmit that emergency packet,thus decreasing delay.Compared with relevant protocols,QS-PS can achieve high energy efficiency and decrease the delay of both normal packets and emergency packets.

美国国家半导体推出四款全新高电压非同步降压控制器

美国国家半导体公司(National Semiconductor Corporation)宣布推出四款全新的高电压非同步降压控制器,其完备的功能特性主要包括:适用于极高的输入电压,可以提供卓越的脉冲宽度调制(PWM)控制,而且还可减少电磁干扰(EMI)。这几款高度集成且操作简单的降压控制器可以在高输入电压下,产生功率灵敏的低电压电路,最适用于电信、网络系统及工业基建设备。新推出的这几款控制器属於PowerWise高能源效率产品。

自克罗地亚瞻望电子前沿

克罗地亚此时进入我们的视野,是由于德国柏林国际电子消费品展览会(下称"IFA")今年选择了该国的亚得里亚海滨古港杜布罗夫尼克作为展前发布会城市。

看好市场增长潜力 跨国化企深挖中国发展机会

虽然中国经济增速进一步放缓,但经济增长转向更高能源效率的可持续发展模式,特别是城市化进程不断加快,将为海内外化工企业提供巨大的市场机会。一些在华经营的跨国化工公司近日表示,面临中国经济增速放缓和其他挑战,他们将继续致力于中国化学品生产,并看好中国市场巨大增长机会。巴斯夫：继续增加在华产能巴斯夫大中华区总裁兼董事长柯迪文称，虽然全球经济环境发生了显著变化，但巴斯夫仍然对中国市场潜力充满信心。