@article{9023963,
 abstract = {We study the generalized degrees of freedom (gDoF) of block-fading noncoherent multiple input multiple output (MIMO) channels with asymmetric distributions of link strengths and a coherence time of T symbol durations. We derive the optimal signaling structure for communication for the asymmetric MIMO channel, which is distinct from that for the MIMO channel with independent and identically distributed (i.i.d.) links. We extend the existing results for the single input multiple output (SIMO) channel with i.i.d. links to the asymmetric case, proving that selecting the statistically best antenna is gDoFoptimal. Using the gDoF result for the SIMO channel, we prove that for T = 1, the gDoF is zero for MIMO channels with arbitrary link strengths. We show that selecting the statistically best antenna is gDoF-optimal for the multiple input single output (MISO) channel. We also derive the gDoF for the 2 x 2 MIMO channel with different exponents in the direct and cross links. In this setting, we show that it is always necessary to use both the antennas to achieve the gDoF, in contrast to the results for the 2 x 2 MIMO channel with i.i.d. links. We show that having weaker crosslinks, gives gDoF gain compared to the case with i.i.d. links. For the noncoherent MIMO channel with i.i.d. links, the traditional method of training each transmit antenna independently is degrees of freedom (DoF) optimal, whereas we observe that for the asymmetric 2 x 2 MIMO channel, the traditional training is not gDoF-optimal. We extend this observation to a larger MxM MIMO channel by demonstrating a strategy that can achieve larger gDoF than a traditional trainingbased method.},
 author = {J. {Sebastian} and S. N. {Diggavi}},
 doi = {10.1109/TIT.2020.2978183},
 issn = {1557-9654},
 journal = {IEEE Transactions on Information Theory},
 keywords = {MIMO communication;MISO communication;SIMO communication;transmitting antennas;generalized degrees freedom;noncoherent MIMO channel;asymmetric link strengths;block-fading noncoherent multiple input multiple output channels;asymmetric distributions;optimal signaling structure;asymmetric MIMO channel;single input multiple output channel;asymmetric case;SIMO channel;arbitrary link strengths;multiple input single output channel;direct links;cross links;gDoF gain;degrees of freedom optimal;MxM MIMO channel;MIMO communication;Signal to noise ratio;Fading channels;Transmitting antennas;Coherence;MISO communication;Degrees of freedom (DoF);multiple antennas;time-varying channels;noncoherent communication},
 month = {July},
 number = {7},
 pages = {4431-4448},
 tags = {journal,IT,ANIT,WiNetnew,NCWN,WNIF},
 title = {Generalized Degrees Freedom of Noncoherent MIMO Channels With Asymmetric Link Strengths},
 type = {2},
 volume = {66},
 year = {2020}
}