Streaming Transmission over Block Fading Channels with Delay Constraint
Streaming Transmission over Block Fading Channels with Delay Constraint
复制标题
具有延迟约束的块衰落通道上的流传输
DOI：
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发表时间：
2013
影响因子：
10.4
通讯作者：
C. Ibars
中科院分区：
文献类型：
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作者：
G. Cocco;Deniz Gündüz;C. Ibars
假设发射器以恒定速率在每个通道块上接收新消息，从而通过恒定速率研究了块褪色通道的流传输，该消息是由基础应用程序固定的。假定所有消息都假定一个通用的截止日期，此时，接收器试图解码尽可能多的消息。提出了各种可实现的方案，并将其与知情的发射器上限进行比较。结果表明，自适应关节编码（AJE）方案在渐近上是最佳的。也就是说，随着传输截止日期为无限，它实现了千古的能力。在有限的传输截止日期的情况下，它非常遵循上限。另一方面，在存在不同信噪比（SNR）的多个接收器的情况下，无内存传输（MT），广义时间共享（GTS）和叠加传输（ST）方案比关节编码（JE）方案随着SNR的降低而具有逐渐降解。
Streaming transmission over a block fading channel is studied assuming that the transmitter receives a new message at each channel block at a constant rate, which is fixed by an underlying application. A common deadline is assumed for all the messages, at which point the receiver tries to decode as many messages as possible. Various achievable schemes are proposed and compared with an informed transmitter upper bound in terms of average throughput. It is shown that the adaptive joint encoding (aJE) scheme is asymptotically optimal; that is, it achieves the ergodic capacity as the transmission deadline goes to infinity; and it closely follows the upper bound in the case of a finite transmission deadline. On the other hand, in the presence of multiple receivers with different signal-to-noise ratios (SNR), memoryless transmission (MT), generalized time-sharing (gTS) and superposition transmission (ST) schemes are shown to be more robust than the joint encoding (JE) scheme as they have gradual performance degradation with the decreasing SNR.