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首页> 外文期刊>IEEE Transactions on Information Theory >Multiuser Constrained Water-Pouring for Continuous-Time Overloaded Gaussian Multiple-Access Channels
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Multiuser Constrained Water-Pouring for Continuous-Time Overloaded Gaussian Multiple-Access Channels

机译：连续时间过载的高斯多路访问信道的多用户约束注水

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摘要

In this paper, signature waveforms and signal powers are jointly optimized for multiuser communications over strictly bandlimited, continuous-time, overloaded channels corrupted by additive white Gaussian noise (AWGN). The total signal power is minimized subject to general asymmetric signal-to-interference-plus-noise ratio (SINR) constraints at the output of linear minimum mean-squared error (LMMSE) receivers. Using vectorized Fourier transform (VFT) technique, the optimal solutions as well as a necessary and sufficient condition for the existence of a feasible solution are derived in the frequency domain. It turns out that every optimal solution performs the same as the optimal frequency-division multiple-access (FDMA) system. A geometric procedure called multiuser constrained water-pouring is developed to construct every possible optimal solution, of which profiles of signal power and equivalent bandwidth are, respectively, the same as those of signal power and physical bandwidth of the optimal FDMA system. It is shown that orthogonal signature waveforms are assigned to oversized users and continuous-time equivalents of generalized Welch bound equality (CTE-GWBE) sequences are assigned to non-oversized users.
机译：在本文中，签名波形和信号功率被联合优化，以通过严格的带限，连续时间，过载信道（由加性高斯白噪声（AWGN）破坏）进行多用户通信。在线性最小均方误差（LMMSE）接收器的输出端受到一般不对称信号干扰加噪声比（SINR）约束的情况下，总信号功率被最小化。使用矢量傅里叶变换（VFT）技术，在频域中推导了最优解以及存在可行解的充要条件。事实证明，每种最佳解决方案的性能都与最佳频分多址（FDMA）系统相同。开发了一种称为多用户约束注水的几何程序，以构造每个可能的最佳解决方案，其信号功率和等效带宽的分布分别与最佳FDMA系统的信号功率和物理带宽的分布相同。结果表明，正交签名波形被分配给超大用户，而连续时间等效的广义韦尔希约束等式（CTE-GWBE）序列被分配给非超大用户。

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