Spatial shaping in cognitive system with coded legacy transmission

2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI:10.1109/WSA.2011.5741949

Jing Lv, Eduard Axel Jorswieck

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引用次数: 13

Abstract

We consider the coexistence of a secondary user with a single-antenna primary link which is not fully loaded. The secondary user has multiple antennas and performs spatial shaping. First we consider the case when single-user decoding is deployed at the cognitive receiver. By spatial shaping, the secondary user can optimize its achievable rate under the rate constraint of the primary user, and a closed-form solution is derived. Then we study the case when successive decoding is viable at the cognitive receiver and rate splitting is applied at the cognitive transmitter. In both cases the cognitive transmitter can operate at its full power. Both theoretical analysis and simulation results show that spatial shaping with single-user decoding converges to maximum ratio transmission (MRT) as the primary link approaches null load, and converges to zero forcing (ZF) as the primary link approaches full load. When successive decoding is viable, rate splitting increases the cognitive rate compared to single-user decoding. Finally, we discuss the control signaling needed to perform spatial shaping in cognitive system with legacy transmission.

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具有编码遗传传递的认知系统的空间塑造

我们考虑一个辅助用户与未完全加载的单天线主链路共存。辅助用户具有多个天线并进行空间整形。首先，我们考虑在认知接收器上部署单用户解码的情况。通过空间整形，二级用户在主用户速率约束下优化其可达速率，并推导出封闭解。然后，我们研究了在认知接收端可以连续解码，而在认知发送端可以进行速率分割的情况。在这两种情况下，认知传递器都能发挥最大的作用。理论分析和仿真结果表明，单用户译码的空间整形在主链路接近零负载时收敛于最大比率传输(MRT)，在主链路接近满载时收敛于零强制(ZF)。当连续解码可行时，与单用户解码相比，速率分割提高了认知率。最后，我们讨论了在具有遗留传递的认知系统中执行空间塑造所需的控制信号。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 International ITG Workshop on Smart Antennas

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