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arXiv 0908.1077cs.ITmath.IT
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MISO认知无线电网络中的波束成形和速率分配

Beamforming and Rate Allocation in MISO Cognitive Radio Networks

Ali Tajer, Narayan Prasad, Xiaodong Wang

摘要:

我们考虑分散的多天线认知无线电网络,其中二级(认知)用户被授予同时频谱接入与持牌(主要)用户。我们对待分布式波束形成和速率分配的问题,使最小加权的二次速率最大化的二次用户。这样的优化受制于(1)用于次级用户的有限加权和功率预算,以及(2)在施加在每个初级接收机上的干扰电平不超过指定电平的意义上对初级用户的保证保护。基于由次级接收器部署的解码方法,我们考虑用于解决此问题的三种情形。在第一种情况下,每个次级接收器仅解码其指定的发射器,同时抑制其余的作为高斯干扰器(单用户解码)。在第二种情况下,每个次级接收器采用最大似然解码器(MLD)来联合解码所有次级传输,并且在第三种情况下,每个次级接收器使用无约束组解码器(UGD)。通过部署UGD,允许每个次级用户在抑制或取消剩余用户之后解码用户的任何任意子集(其包含其指定用户)。

英文摘要:

We consider decentralized multi-antenna cognitive radio networks where secondary (cognitive) users are granted simultaneous spectrum access along with license-holding (primary) users. We treat the problem of distributed beamforming and rate allocation for the secondary users such that the minimum weighted secondary rate is maximized. Such an optimization is subject to (1) a limited weighted sum-power budget for the secondary users and (2) guaranteed protection for the primary users in the sense that the interference level imposed on each primary receiver does not exceed a specified level. Based on the decoding method deployed by the secondary receivers, we consider three scenarios for solving this problem. In the first scenario each secondary receiver decodes only its designated transmitter while suppressing the rest as Gaussian interferers (single-user decoding). In the second case each secondary receiver employs the maximum likelihood decoder (MLD) to jointly decode all secondary transmissions, and in the third one each secondary receiver uses the unconstrained group decoder (UGD). By deploying the UGD, each secondary user is allowed to decode any arbitrary subset of users (which contains its designated user) after suppressing or canceling the remaining users.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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