5 problems

ZFBF optimality conjecture. ZFBF, and hence DBS, can achieve the best performance among linear precoding schemes in the XL-MIMO regime.

Consider an LSE precoder using a finite $M$-PSK constellation, with a finite antenna-to-user factor $\alpha$. Let $D$ denote its asymptotic distortion. Nonzero-distortion conjectur…

Let $\mathbf{C}_{j}^{{\rm F}}$ denote the precoding matrix used by the $j$th small-cell network node for its backhaul signal $\mathbf{u}_{j,\mathrm{b}}[t]$. Unitary precoder conjec…

Let a communication system use a discrete input alphabet with linear precoding at the channel input. Suppose that, without precoding, the outage region is outer (inner) bounded by…

Let $\Gamma(\mathbf{Q},R)$ denote the goodput-to-power ratio, let $P_{\mathrm{out}}(\mathbf{Q},R)$ denote the outage probability, and let $\overline{P}$ be the available transmit-p…