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Joint source-channel coding has been shown to yield optimal end-to-end performance in terms of overall expected distortion for quasi-static fading channels. Due to the inherent broadcast nature of the wireless medium, wireless communications are susceptible to eavesdropping. Thus, it is unclear how imposing additional secrecy constraint on the system will affect the end-to-end performance of the joint...
In the two-way relay channel, two sources exchange information with help from a relay. We study a more general relay network with additional pairs of sources that perform pair-wise information exchange. We obtain achievable rate regions for amplify-and-forward and decode-and-forward (DF) relaying schemes based on both Gaussian codes and lattice codes, assuming a two-phase protocol. The lattice-code-based...
Wireless networks are susceptible to eavesdropping due to the inherent broadcast nature of the wireless medium. However, it is also this broadcast nature of wireless communications that allows cooperation among multiple users or relay nodes. Thus, it is unclear how cooperation and secrecy interacts, particularly in the scenario when each node in the network is equipped with multiple antennas (MIMO)...
In the conventional two-way relay channel, two sources exchange information with help from a relay. We introduce a generalized two-way relay channel where each source additionally sends private information to the relay. For this channel, we consider a protocol that consists of a multiple- access (MA) phase and a broadcast (BC) phase and obtain achievable rate regions for both phases. The MA phase...
This paper proposes a class of space-time (ST) codes for supporting applications that demand unequal error protection. Traditionally, an ST code is designed to support a single information stream aiming to achieve a point on the fundamental rate versus diversity trade-off curve. The construction in this paper is based on the diversity-embedded codes recently proposed by Diggavi et.al., where-in ST...
We introduce the multiple access relay channel with generalized feedback (MARC-GF), which is more general than the known MARC (without feedback) and MAC-GF (without relay). In the MARC-GF, two sources, assisted by a common relay, send independent messages to a destination. The sources and relay each receives some feedback that may facilitate this communication. We propose and analyze a decode-and-forward...
We derive the capacity of multicast transmissions on a class of erasure networks. The network model incorporates interference in the form of a finite-field additive multiple-access channel for the receiver on each node, but there is no broadcast constraint (any node can transmit independent symbols on each of its outgoing edges). Assuming knowledge of erasure locations at destination nodes, we derive...
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