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首页> 外文期刊>Communications, IET >Adaptive rate and power transmission in spectrum-sharing systems with statistical interference constraint
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Adaptive rate and power transmission in spectrum-sharing systems with statistical interference constraint

机译：具有统计干扰约束的频谱共享系统中的自适应速率和功率传输

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摘要

The present study attempted to investigate the capacity gains in a spectrum-sharing system where the transmit power and rate of the secondary user (SU) are adapted based on the spectrum sensing information about activity of primary user (PU) and statistical channel fading gain between the SU transmitter (SUT) and PU receiver (PUR). It was assumed that the SU can use the spectrum band originally allocated to PU, based on the definition that when the PU is present in the spectrum band, the SU must consider the peak transmit power and statistical interference constraints. In addition, when the PU is absent at the spectrum band, the SU can only consider the peak transmit power constraint. The main advantage of using statistical interference constraint is that it does not require the instantaneous feedback channel between SUT and PUR. Furthermore, to maximise the achievable capacity of the SU, the average transmit power was first calculated. Then the adaptive rate and power policy were inspected for maximising the achievable capacity under said constraints and bit error rate requirements in multilevel quadrature amplitude modulation. Numerical and comparison results representing the efficiency of the proposed system are also provided.
机译：本研究试图研究频谱共享系统中的容量增益，在该频谱共享系统中，基于有关主要用户（PU）的活动和之间的统计信道衰落增益的频谱感知信息来调整次要用户（SU）的发射功率和速率SU发送器（SUT）和PU接收器（PUR）。基于以下定义，假定SU可以使用最初分配给PU的频谱带：当PU存在于频谱带中时，SU必须考虑峰值发射功率和统计干扰约束。另外，当在频谱带上不存在PU时，SU只能考虑峰值发射功率约束。使用统计干扰约束的主要优点是它不需要SUT和PUR之间的瞬时反馈通道。此外，为了最大化SU的可实现容量，首先要计算平均发射功率。然后检查自适应速率和功率策略，以在所述约束和多级正交幅度调制中的误码率要求下最大化可实现的容量。还提供了表示所提出系统效率的数值和比较结果。

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  • 来源
    《Communications, IET》 |2014年第6期|870-877|共8页
  • 作者

    Khederzadeh R.; Farrokhi H.;

  • 作者单位

    Dept. of Electr. & Comput. Eng., Univ. of Birjand, Birjand, Iran;

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