Energy Efficiency Improvement of Coded OFDM Systems Based on PAPR Reduction
Energy Efficiency Improvement of Coded OFDM Systems Based on PAPR Reduction
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DOI：
10.1109/jsyst.2015.2469783
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发表时间：
2017-05
影响因子：
4.4
通讯作者：
R. Yoshizawa;H. Ochiai
中科院分区：
文献类型：
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作者：
R. Yoshizawa;H. Ochiai
对于长距离无线通信，功率放大器（PA）是发射机中最耗电的设备之一。在最近的许多追求更高频谱效率的无线标准中，采用了具有高峰均功率比（PAPR）的信号技术，如正交频分复用（OFDM），但它们通常以较差的PA效率而结束。因此，文献中提出了多种降低PAPR的方法，从物理层角度提高功率效率。在本文中，我们研究了OFDM信号的功率效率可以通过这种PAPR降低技术实现多少改进，并从系统级设计的角度评估了可实现的编码帧错误率（FER）。结果表明，除了提高功率放大器效率外，精心设计的功率放大器比降低技术实际上有可能降低接收器达到给定目标功率比所需的信噪比，并降低发射器电路在给定目标信息率下的占空比。这反过来又有助于减少移动终端发射机消耗的总能量，从而导致更环保的通信系统。
For long-distance wireless communications, a power amplifier (PA) is one of the most power-hungry devices at a transmitter. In many recent wireless standards that pursue higher spectral efficiency, signaling techniques with a high peak-to-average power ratio (PAPR) such as orthogonal frequency-division multiplexing (OFDM) have been adopted, but they typically end up with poor PA efficiency. A variety of PAPR reduction approaches have been thus proposed in literature to improve the power efficiency from the physical-layer perspective. In this paper, we investigate how much improvement in terms of the power efficiency can be achieved by such PAPR reduction techniques for OFDM signaling, and we evaluate the achievable coded frame error rate (FER) from a viewpoint of system-level design. It reveals that, in addition to the improvement of the PA efficiency, carefully designed PAPR reduction techniques in fact have a potential of reducing the required signal-to-noise power ratio at a receiver for achieving a given target FER and reducing the duty cycle of a transmitter circuit for a given target information rate. This in turn helps in reducing the total energy consumed at the transmitter of mobile terminals and thus leads to greener communication systems.