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On Downlink Transmission Without Transmit Channel State Information and With Outage Constraints

机译：没有传输信道状态信息且具有中断约束的下行链路传输

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This paper investigates downlink transmission over a quasi-static fading Gaussian broadcast channel (BC), to model delay-sensitive applications over slowly time-varying fading channels. System performance is characterized by the outage capacity region. In contrast to most previous work, here the problem is studied under the key assumption that the transmitter knows only the probability distributions of the fading coefficients, not their realizations. For scalar-input channels, two coding schemes are studied. The first scheme is called blind dirty paper coding (B-DPC), which utilizes a robustness property of dirty paper coding to perform precoding at the transmitter. The second scheme is called statistical superposition coding (S-SC), in which each receiver adaptively performs successive decoding with the process statistically governed by the realized fading. Both B-DPC and S-SC schemes achieve the outage capacity region, which dominates the outage rate region of time-sharing, irrespective of the particular fading distributions. The S-SC scheme can be extended to BCs with multiple transmit antennas.
机译：本文研究了准静态衰落高斯广播信道（BC）上的下行链路传输，以对慢时变衰落信道上的时延敏感应用建模。系统性能以中断容量区域为特征。与大多数以前的工作相比，这里的问题是在以下关键假设下进行研究的：发射机仅知道衰落系数的概率分布，而不知道它们的实现。对于标量输入通道，研究了两种编码方案。第一种方案称为盲脏纸编码（B-DPC），它利用脏纸编码的鲁棒性在发射机处执行预编码。第二种方案称为统计叠加编码（S-SC），其中，每个接收器自适应地执行连续解码，其过程由实现的衰落统计控制。无论特定的衰落分布如何，B-DPC和S-SC方案均实现了中断容量区域，该区域在分时的中断速率区域中占主导地位。 S-SC方案可以扩展到具有多个发射天线的BC。

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