English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper considers linear precoding for constant channel-coefficient$K$-User MIMO Gaussian Interference Channel (MIMO GIC) where eachtransmitter-$i$ (Tx-$i$), requires to send $d_i$ independent complex symbolsper channel use that take values from fixed finite constellations with uniformdistribution, to receiver-$i$ (Rx-$i$) for $i=1,2,\cdots,K$. We define themaximum rate achieved by Tx-$i$ using any linear precoder, when theinterference channel-coefficients are zero, as the signal to noise ratio (SNR)tends to infinity to be the Constellation Constrained Saturation Capacity(CCSC) for Tx-$i$. We derive a high SNR approximation for the rate achieved byTx-$i$ when interference is treated as noise and this rate is given by themutual information between Tx-$i$ and Rx-$i$, denoted as $I[X_i;Y_i]$. A set ofnecessary and sufficient conditions on the precoders under which $I[X_i;Y_i]$tends to CCSC for Tx-$i$ is derived. Interestingly, the precoders designed forinterference alignment (IA) satisfy these necessary and sufficient conditions.Further, we propose gradient-ascent based algorithms to optimize the sum-rateachieved by precoding with finite constellation inputs and treatinginterference as noise. Simulation study using the proposed algorithms for a3-user MIMO GIC with two antennas at each node with $d_i=1$ for all $i$, andwith BPSK and QPSK inputs, show more than 0.1 bits/sec/Hz gain in the ergodicsum-rate over that yielded by precoders obtained from some known IA algorithms,at moderate SNRs.

On Precoding for Constant K-User MIMO Gaussian Interference Channel with Finite Constellation Inputs