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Fifth generation (5G) communication systems include enhanced mobile broadband, massive machine-type communication, and ultra-reliable low-latency communication. To support various 5G applications, researchers have considered multiple scalable subcarrier spacing and transmission time interval (TTI). In this paper, we introduce a concept of waveform multiplexing for frequency multiplexing of numerologies...
The wireless Internet market has been growing rapidly since NTT DoCoMo first introduced the service in 1999. This paper provides a framework within which the wireless Internet market can be analysed so as to draw valuable policy implications. We show that if platforms are standardized: (i) social welfare is increased with the rational expectation of larger installed bases; (ii) the neutrality of a...
In a country where individualism is emphasized less than in Western countries, we ask whether the CEO (shacho) of a Japanese corporation positively affects firm performance. To answer this question, we construct a shacho-firm matched panel data set in the period 1990 through 2002 of all listed 1419 Japanese manufacturing firms and their 3520 shachos. Though we find a positive abnormal stock return...
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