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放大转发协同通信中协同时机的选择与误码率性能分析 被引量:3
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作者 石钧 林霏 +1 位作者 路安琼 刘泽民 《电路与系统学报》 CSCD 北大核心 2010年第3期91-95,134,共6页
传统半双工放大转发(AF)协同通信无论信道状态如何,总是采用协同通信模式,在一定程度上降低了系统自由度的利用率。基于此,本文研究了"协同时机"的问题。首先以优化一个具有两用户的AF系统的遍历容量为目标,提出一种改进的放... 传统半双工放大转发(AF)协同通信无论信道状态如何,总是采用协同通信模式,在一定程度上降低了系统自由度的利用率。基于此,本文研究了"协同时机"的问题。首先以优化一个具有两用户的AF系统的遍历容量为目标,提出一种改进的放大转发方式(IAF),通过比较源-目的端与中继-目的端的瞬时信道增益来判定是否需要采用协同通信模式。然后推导给出IAF方式下系统误码差错性能的近似闭合表达式。最后,文章还比较了两种不同功率分配方案下IAF与AF方式的系统性能。理论分析和仿真结果表明,IAF方式在遍历容量和误码差错性能上均优于传统AF方式。 展开更多
关键词 协同通信 放大转发 协同时机 遍历容量 误码率
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The Crucial Role of Time in M&A Activities: An Inductive Exploration
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作者 Nicole Zadrazil Othmar Lehner Heimo Losbichler 《Journal of Modern Accounting and Auditing》 2017年第8期350-370,共21页
Mergers & acquisitions (M&As) are important strategic instruments, yet nearly half of all transactions fail, often resulting in disastrous write-offs and losses for corporations and financing institutions alike - ... Mergers & acquisitions (M&As) are important strategic instruments, yet nearly half of all transactions fail, often resulting in disastrous write-offs and losses for corporations and financing institutions alike - despite promising prospects upfront. Applied research has been trying to find a "panacea" to prevent or at least predict M&A failure, investigating motives, synergies and performance. Despite the growing unease with the stationary explanatory models in literature, research has only marginally focused on the concept of time, with inquiries into market timing and integration speed. Yet other timing concepts have been neglected in concepts so far despite early empirical evidence for their existence. The purpose of this paper is thus to identify and elaborate on the importance of further relevant theories of timing. For this, and true to the exploratory nature of the topic, the authors have chosen a qualitative comparative case study design based on existing case reports which are investigated for narrations highlighting timing concepts. This study reveals six factors which have a crucial impact on the M&A outcome: time of acquisition, M&A duration in its entirety, M&A sequence, synergy chronology, frequency of acquisitions and time to step back. It contributes to theory and practice in outlining the careful attention that needs to be paid in planning in these factors to enhance the chances of a successful M&A transaction. 展开更多
关键词 M&A SUCCESS timing concepts process SYNERGY
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