Multi-User Diversity in a Spectrum Sharing System
Multi-User Diversity in a Spectrum Sharing System
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DOI：
10.1109/t-wc.2009.080326
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发表时间：
2009-01-01
影响因子：
10.4
通讯作者：
Sung, Dan Keun
中科院分区：
文献类型：
--
作者：
Ban, Tae Won;Choi, Wan;Sung, Dan Keun
我们调查的影响，多用户分集的频谱共享系统中，次用户限制性地利用频谱授权给主用户，只有当在主用户的干扰被规定低于预定的水平。这种干扰调节影响了以前在非频谱共享系统中已知的多用户分集增益的特性。我们的数值和分析结果表明，频谱共享系统中的多用户分集增益根据次级用户的发射功率P和预定干扰温度Q给出的条件而不同地增加。如果P充分大于Q，多用户分集增益在容量方面的比例如log（2）（W（N-s））类似于非频谱共享系统中的先前已知的比例律，其中W（.）和N-s分别表示Lambert W函数和次级发射器的数量。然而，当P变得足够大使得P >> QN（s）时，多用户分集增益的缩放律变为log（2）（N-s）。
We investigate the effects of multi-user diversity in a spectrum sharing system where secondary users restrictively utilize a spectrum licensed to primary users only if interference perceived at primary users is regulated below a predetermined level. This interference regulation affects the characteristics of multiuser diversity gains previously known in non-spectrum sharing systems. Our numerical and analytical results show that the multiuser diversity gain in a spectrum sharing system increases differently according to conditions given by the transmit power of secondary users, P, and a predetermined interference temperature, Q - if P is sufficiently larger than Q, the multiuser diversity gain in terms of capacity scales like log(2) (W (N-s)) similarly to a previously known scaling law in the non-spectrum sharing systems, where W(.) and N-s denote a Lambert W function and the number of secondary transmitters, respectively. However, the scaling law of multiuser diversity gain becomes log(2)(N-s) as P becomes sufficiently larger such that P >> QN(s).