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Constant-Envelope Precoding With Time-Variation Constraint on the Transmitted Phase Angles

机译:传输相位角上具有时变约束的恒定包络预编码

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摘要

We consider downlink precoding in a frequency-selective multi-user massive MIMO system with highly efficient but non-linear power amplifiers at the base station (BS). A low-complexity precoding algorithm is proposed, which generates constant-envelope (CE) transmit signals for each BS antenna. To avoid large variations in the phase angle transmitted from each antenna, the difference of the phase angles transmitted in consecutive channel uses is limited to for a fixed . With independent Rayleigh distributed channel gains, numerical studies reveal that the extra total transmit power required under the time variation constraint when compared to the case of no time variation constraint (i.e., ), is ( dB) for many practical values of . Further, irrespective of the value of , the required total transmit power to achieve a fixed per-user information rate decreases by roughly 3 dB with every doubling in the number of BS antennas.
机译:我们考虑在频率选择性的多用户大规模MIMO系统中进行下行链路预编码,该系统具有基站(BS)上的高效但非线性功率放大器。提出了一种低复杂度的预编码算法,该算法为每个BS天线生成恒定包络(CE)发射信号。为了避免从每个天线发射的相位角发生较大变化,连续信道使用中发射的相位角之差仅限于固定。借助独立的瑞利分布式信道增益,数值研究表明,与无时间变化约束(即)的情况相比,在时间变化约束下所需的额外总发射功率为(dB)对于许多实际值。此外,与的值无关,实现固定的每用户信息速率所需的总发射功率随着BS天线数量的每增加一倍而减少大约3 dB。

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