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We consider the average area spectral eeciency (ASE) of variable-rate transmission cellular mobile systems. This ef-ciency is deened as the sum of the maximum average data rates/Hz/unit area supported by a cell's base station. We study this eeciency as a function of the reuse distance for the uplink of FDMA and TDMA systems under diierent interference(More)
We derive the ergodic (Shannon) capacity region of an M-user broadcast fading channel for code-division (CD), time-division (TD) and frequency-division (FD), assuming that both the transmitter and the receivers have perfect channel side information. It is shown that by allowing dynamic resource allocation, TD, FD and CD without successive decoding have the(More)
— We consider a wireless sensor network scenario where closely packed nodes can be grouped into clusters. Although each node might have only a single antenna, nodes within a cluster can cooperate during transmission or reception, thereby forming a cooperative Multiple Input Multiple Output (MIMO) system. Much of the work in the area of cooperative MIMO has(More)
This paper presents a new distributed power control algorithm for ad-hoc wireless networks in random channel environments. Previous work in this area has focused on distributed power control for ad-hoc networks with fixed channels. We show that the algorithms resulting from such formulations do not accurately capture the dynamics of a time-varying channel.(More)
We investigate the optimal placement of transmit antennas in distributed antenna systems. Our optimization framework imposes no constraints on the location of the antennas. Based on stochastic approximation theory, we adopt a formulation that is suitable for node placement optimization in various wireless network scenarios. We show that optimal placement of(More)