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The Wideband Slope of Interference Channels: The Large Bandwidth Case

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2 Author(s)
Minqi Shen ; Dept. of Electr. Eng., Univ. of Hawaii Manoa, Honolulu, HI, USA ; Host-Madsen, A.

It is well known that minimum received energy per bit Eb/N0|min in the interference channel is -1.59 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 ( SNR) regime. However, when the SNR is small but nonzero, Eb/N0|min alone does not characterize performance. Verdu introduced the wideband slope S0 to characterize the performance in this regime. We show that a wideband slope of S0/S0, no interference = 1/2 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 S0/S0, no interference ≤ 1/2 for large number of users K.

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Information Theory, IEEE Transactions on  (Volume:59 ,  Issue: 5 )