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The Wideband Slope of Interference Channels: The Large Bandwidth Case

机译:干扰信道的宽带斜率:大带宽情况

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摘要

It is well known that minimum received energy per bit $ left . {{ E_{b}}over { N_{0}}}right vert _{min }$ in the interference channel is $-1.59;{rm dB}$ as if there were no interference. Thus, the best way to mitigate interference is to operate the interference channel in the low-signal-to-noise-ratio ( $ {rm SNR}$) regime. However, when the SNR is small but nonzero, $ left . {{ E_{b}}over { N_{0}}}right vert _{min }$ alone does not characterize performance. Verdu introduced the wideband slope $ {cal S}_{0}$ to characterize the performance in this regime. We show that a wideband slope of $ {{ {cal S}_{0}}over { {cal S}_{0, {rm no;interference}}}}= {{ 1}over { 2}}$ is achievable. This result is similar to recent results on degrees of freedom in the high-SNR regime, and we use a type of interference alignment using delays to obtain the result. We also show that in many cases, the wideband slope is upper bounded by $ {{ {cal S}_{0}}over { {cal S}_{0, {rm no;interference}}}}leq {{ 1}over { 2}}$ for large number of users $K$.
机译:<?Pub Dtl?>众所周知,每位的最小接收能量为 $。在干扰通道中,{{E_ {b}}在{N_ {0}}}上右移_ {min} $ $-1.59; {rm dB} $ ,就好像没有干扰一样。因此,减轻干扰的最佳方法是在低信号噪声比( $ {rm SNR} $ )机制。但是,当SNR小但非零时,剩下 $。仅{{E_ {b}}到{N_ {0}}}正确的_ {min} $ 并不能代表性能。 Verdu引入了宽带斜率 $ {cal S} _ {0} $ 来表征这种情况下的性能。我们表明,在{{cal S} _ {0,{rm no; interference}上, $ {{{{cal S} _ {0}} }}}} = {{1}超过{2}} $ 是可以实现的。此结果与高SNR方案中自由度的最新结果相似,我们使用一种使用延迟的干扰对准来获得结果。我们还显示,在许多情况下,宽带斜率的上限是<{cal cal} _上的 $ {{{cal S} _ {0}} {0,{rm no; interference}}}} leq {{1} over {2}} $ 适用于大量用户 $ K $

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