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Optimality of Simple Layered Superposition Coding in the 3 User MISO BC With Finite Precision CSIT

机译:具有有限精度CSIT的3用户MISO BC中简单分层叠加编码的最优性

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摘要

We study the K = 3 user multiple input single output (MISO) broadcast channel (BC) with M = 3 antennas at the transmitter and 1 antenna at each receiver, from the generalized degrees of freedom (GDoF) perspective, under the assumption that the channel state information at the transmitter (CSIT) is limited to the finite precision. In particular, our goal is to identify a parameter regime where a simple layered superposition (SLS) coding scheme achieves the entire GDoF region. With alpha(ij) representing the channel strength parameter for the link from the j(th) antenna of the transmitter to the i(th) receiver, we prove that the SLS is GDoF optimal without the need for time-sharing if max(alpha(ki), alpha(im)) <= alpha(ii) and alpha(ki) + alpha(im) <= alpha(ii) + alpha(km) for all i, k is an element of [3], m is an element of [M]. The GDoF region under this condition is a convex polyhedron. The result generalizes to arbitrary M >= 3.
机译:我们从广义自由度(GDoF)的角度出发,研究了K = 3用户多输入单输出(MISO)广播信道(BC),其中发射机= M = 3天线,每个接收机= 1天线。发射机(CSIT)的信道状态信息被限制为有限的精度。特别地,我们的目标是确定一个参数体系,其中简单的分层叠加(SLS)编码方案可实现整个GDoF区域。用alpha(ij)表示从发射机的第j个天线到第i个接收机的链路的信道强度参数,我们证明SLS是GDoF最优的,如果max(alpha (ki),alpha(im))<= alpha(ii)和alpha(ki)+ alpha(im)<= alpha(ii)+ alpha(km)对于所有i,k是[3]的元素,m是[M]的元素。在这种条件下的GDoF区域是凸多面体。结果概括为任意M> = 3。

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