Achievable Capacity in Hybrid DS-CDMA/OFDM Spectrum-Sharing
Achievable Capacity in Hybrid DS-CDMA/OFDM Spectrum-Sharing
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DOI：
10.1109/tmc.2010.15
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发表时间：
2010-06-01
影响因子：
7.9
通讯作者：
Yanikomeroglu, Halim
中科院分区：
文献类型：
--
作者：
Khoshkholgh, Mohammad G.;Navaie, Keivan;Yanikomeroglu, Halim
本文研究了DS-CDMA/ofdm频谱共享系统，得到了衰落环境下不同子信道选择策略下二次业务的可实现容量。子信道选择策略分为两类：均匀子信道选择和非均匀子信道选择。在子信道状态信息的先验知识在辅助发射机处不可用的情况下，优选统一的子信道选择。对于有子信道状态信息先验知识的情况，我们研究了各种非均匀的子信道选择策略。在每种情况下，我们都得到了最优的二次服务功率分配和相应的最大可实现容量。然后，我们给出了多用户DS-CDMA/OFDM系统中机会频谱共享的标度律结果。数值结果表明，最优子信道选择是以副发射机和主接收机之间的子信道增益最小值为依据的。
In this paper, we consider DS-CDMA/OFDM spectrum sharing systems and obtain the achievable capacity of the secondary service under different subchannel selection policies in the fading environment. Subchannel selection policies are divided into two categories: uniform subchannel selection, and nonuniform subchannel selection. Uniform subchannel selection is preferred for cases where a priori knowledge on subchannels state information is not available at the secondary transmitter. For cases with available a priori knowledge on subchannels state information, we study various nonuniform subchannel selection policies. In each case, we obtain the optimum secondary service power allocation and the corresponding maximum achievable capacity. Then we present results on the scaling law of the opportunistic spectrum sharing in DS-CDMA/OFDM systems with multiple users. Numerical results show that the optimal subchannel selection is based on the minimum value of the subchannel gain between the secondary transmitter and the primary receiver.