In this paper, we present three protocols for bidirectional coded cooperation. In coded bi-directional cooperation, two agents wish to communicate with each other in the presence of a relay node that may help.The first protocol is a two phase protocol where both users simultaneously transmit during the first phase and the relay alone transmits during the second. The second protocol considers sequential transmissions from the two users followed by a transmission from the relay while the third protocol is a hybrid of the first two protocols and has four phases.In a shared half-duplex channel, as each user is unable to receive a signal while simultaneously transmitting, the first protocol limits any received signal for the end users to arrive from the relay only. In contrast, the second and third protocols allow for each end-user to received signals from both the relay and the other user. Thus, in the second and third protocols, there is potential for additional "side-information" at each receiving agent. In this paper, we show that this side-information may be used to yield more diversity and thereby greatly increase communication reliability over fading channels.Finally, we consider channel models based on the Joint Tactical Radio System (JTRS), and compute outage probabilities and achievable rates. Based on these results, the relative merits of each protocol is discussed in various regimes. Furthermore, experiments demonstrate the performance with the proposed protocols dominates the traditional three phase coded relaying protocol in which the side-information is not used. These results may be explained by the additional diversity provided by the proper utilization of the side-information.These results have significant applications in the design of net-centric systems for tactical environment, particularly in the design of medium access control for mobile ad-hoc networks and robust communication in tactical edge networks.
There has been a tremendous increase in demand for real-time video applications over military networks. Multicast provides an efficient solution for simultaneous content delivery to a group of users. It is especially valuable for military applications, as it saves network resources by sharing the data streams across receivers. Even with ever increasing channel bandwidth and computation power, efficiently multicasting video over the tactical edge is still challenging due to factors such as higher packet loss ratio, bandwidth variations and the heterogeneity of the users. In this paper, we explore the use of omni-directional relays to improve the performance of wireless video multicast in tactical environments. We focus on assessing the trade-off between total relay energy, coverage area and video quality. The results provide achievable operational regions, which can serve as a reference and a starting point for system design.
We illustrate a novel wireless intranet networking protocol providing the flexibility and efficiency needed to operate in airborne environments. A critical component of this protocol is an efficient mobile ad-hoc networking (MANET) design, known as Adaptive Hybrid Domain Routing (AHDR) protocol, devised primarily for airborne networking. We describe the driving networking requirements and tradeoffs, protocol architecture, and measured and simulated performance. The MANET element in this protocol is composed of a strategic combination of proactive and reactive algorithms. It provides updated route information for neighbor nodes and offers optimized route resolution for unknown routes in a fast-changing topology. The set of optimization parameters for making routing decisions is configurable via a network management module. The selection of the best route, data rate, transmission power, message format, frame length, and transmission time is distributed and depends on real-time optimization parameters. INTRODUCTIONAirborne networking is a key enabling technology to realize the transformational communication vision to provide network-centric operation. With extended connectivity and a design for interoperability, airborne networks can extend the capabilities of the GIG into the tactical edge airborne and space environments. In this paper we discuss several challenges in designing and implementing airborne networking technology, and describe an approach that has been demonstrated to achieve successful results in realizing effective airborne networking for tactical communication.
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