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Access configuration of femtocell networks carries critical importance due to the resulting interference scenarios. Especially in closed-access femtocell networks, there might be significant interference between the femtocell and the macrocell users. In this paper, we evaluate the capacity of closed access femtocell networks employing various dynamic spectrum reuse techniques. When there is a macrocell...
Capacity of Mobile Ad Hoc Networks using a single channel and a single interface reduces due to channel interference and collision. Use of multiple non overlapping channels increases the network capacity by allowing more concurrent transmissions. A single interface together with multiple channels results in high switching delay. As a result multiple interfaces should be used to reduce the switching...
This paper presents an achievable rate region for a 2-user Gaussian Z-interference channel with a noiseless and bidirectional digital communication link between the receivers. The region is achieved by utilizing the rate-splitting encoding technique, and the decode-and-forward and compress-and-forward strategies. In the very strong interference regime, the capacity region is achieved. In the weak...
The randomized fixed-composition codes with optimal decoding error exponents are recently studied in for the finite alphabet interference channel with two transmitter-receiver pairs. In this paper we investigate the capacity region for randomized fixed-composition codes. A complete characterization of the capacity region of the said coding scheme is given. The inner bound is derived by showing the...
We attempt to quantify end-to-end throughput in multihop wireless networks using a metric that measures the maximum density of source-destination pairs that can successfully communicate over a specified distance at certain data rate. We term this metric the random access transport capacity, since it is similar to transport capacity but the interference model presumes uncoordinated transmissions. A...
We evaluate the peak and average power savings due to relay deployments in cellular systems via a simulation study. The peak power savings translate to cost reduction in power amplifiers. The average power savings lead to savings in electricity bills. Half-duplex relays are placed one per sector in a 19-cell, 57-sector cellular network. In the baseline case, the base stations control their transmit...
We consider the multiplexing gain (MUXG) of the fully connected i??i??-user line-of-sight (LOS) interference channels (ICs). A polarimetric antenna composed of 3 orthogonal electric dipoles and 3 orthogonal magnetic dipoles is considered where all 6 dipoles are co-located. In case of K-user IC with single polarization, the maximum achievable MUXG is K regardless of the number of transmit and receive...
We study the capacity of a class of deterministic discrete memoryless interference channels. Recent studies show that, in general, interference alignment is required to achieve capacity in interference channels. While interference alignment in general needs structured coding, we identify two scenarios where random coding achieves capacity and leads to single-letter capacity characterizations in deterministic...
Employing complex scrambling code (CSC) would introduce quasi-orthogonal address code interference (QOACI) in QPSK I-Q sub-channel, resulting in the decrease of the system capacity, presenting two ameliorated scrambling code schemes, then according to the simulation result, because of the complicated constellations, the system capacity would decline correspondingly.
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