On outer bounds to the capacity region of wireless networks

Upper Bounds to the Capacity of Wireless Networks

On the capacity region of broadcast over wireless erasure networks

In this paper, we consider a special class of wireless networks, called wireless erasure networks. In these networks, each node is connected to a set of nodes by independent erasure channels. The network model incorporates the broadcast nature of the wireless environment in that each node sends out the same signal on its outgoing channels. However, we assume there is no interference in receptio...

New Outer Bounds on the Capacity Region of Gaussian Interference Channels

Recent outer bounds on the capacity region of Gaussian interference channels are generalized to m-user channels with m > 2 and asymmetric powers and crosstalk coefficients. The bounds are again shown to give the sum-rate capacity for Gaussian interference channels with low powers and crosstalk coefficients. The capacity is achieved by using single-user detection at each receiver, i.e., treating...

Bounds on the outer-independent double Italian domination number

An outer-independent double Italian dominating function (OIDIDF)on a graph $G$ with vertex set $V(G)$ is a function$f:V(G)longrightarrow {0,1,2,3}$ such that if $f(v)in{0,1}$ for a vertex $vin V(G)$ then $sum_{uin N[v]}f(u)geq3$,and the set $ {uin V(G)|f(u)=0}$ is independent. The weight ofan OIDIDF $f$ is the value $w(f)=sum_{vin V(G)}f(v)$. Theminimum weight of an OIDIDF on a graph $G$ is cal...

CAPACITY BOUNDS AND SCALING LAWS OF WIRELESS RELAY NETWORKS by

Driven by the fast-growing demand on wireless applications, cooperative relaying has recently received much attention. In this dissertation, cooperative relaying in MIMO systems and sensor networks is studied extensively, with focus on capacity bounds and scaling laws. The first thrust is on the capacity bounds of MIMO relay channels. First, a Gaussian MIMO relay channel model with fixed channe...