The dirty MIMO multiple-access channel
- Creators
- Khina, Anatoly
- Kochman, Yuval
- Erez, Uri
Abstract
In the scalar dirty multiple-access channel, in addition to Gaussian noise, two additive interference signals are present, each known non-causally to a single transmitter. It was shown by Philosof et al. that for strong interferences, an i.i.d. ensemble of codes does not achieve the capacity region. Rather, a structured-codes approach was presented, which was shown to be optimal in the limit of high signal-to-noise ratios (SNRs), where the sum-capacity is dictated by the minimal ("bottleneck") channel gain. In the present work, we consider the multiple-input multiple-output (MIMO) variant of this setting. In order to incorporate structured codes in this case, one can utilize matrix decompositions, which transform the channel into effective parallel scalar dirty multiple-access channels. This approach however suffers from a "bottleneck" effect for each effective scalar channel and therefore the achievable rates strongly depend on the chosen decomposition. It is shown that a recently proposed decomposition, where the diagonals of the effective channel matrices are equal up to a scaling factor, is optimal at high SNRs, under an equal rank assumption.
Additional Information
© 2016 IEEE.Additional details
- Eprint ID
- 69867
- DOI
- 10.1109/ISIT.2016.7541545
- Resolver ID
- CaltechAUTHORS:20160823-160229741
- Created
-
2016-08-23Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field