Delay optimal broadcast for multihop wireless networks using self-interference cancellation

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DELAY-OPTIMAL BROADCAST FOR MULTIHOP WIRELESS NETWORKS
USING SELF-INTERFERENCE CANCELLATION
ABSTRACT:
In this paper, we propose a new protocol called Chorus that improves the efficiency and
scalability of broadcast service with a MAC/PHY layer that allows packet collisions. Chorus is
built upon the observation that packets carrying the same data can be effectively detected and
decoded, even when they overlap with each other and have comparable signal strengths. It
resolves collision using symbol-level interference cancellation, and then combines the resolved
symbols to restore the packet. Such a collision-tolerant mechanism significantly improves the
transmission diversity and spatial reuse in wireless broadcast.
Chorus’ MAC-layer cognitive sensing and scheduling scheme further facilitates the realization of
such an advantage, resulting in an asymptotic broadcast delay that is proportional to the network
radius. We evaluate Chorus’ PHY-layer collision resolution mechanism with symbol-level
simulation, and validate its network-level performance via ns-2, in comparison with a typical
CSMA/CA-based broadcast protocol. Our evaluation validates Chorus’s superior performance
with respect to scalability, reliability, delay, etc., under a broad range of network scenarios (e.g.,
single/multiple broadcast sessions, static/mobile topologies).
ECWAY TECHNOLOGIES
IEEE PROJECTS & SOFTWARE DEVELOPMENTS
OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE
CELL: +91 98949 17187, +91 875487 2111 / 3111 / 4111 / 5111 / 6111
VISIT: www.ecwayprojects.com MAIL TO: ecwaytechnologies@gmail.com

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to all neighbors of a network node v under the assumption that v does not participate due to being corrupted or damaged. We present practical network protocol that can be used completely reactive. It is parameterized with a positive integer k ∈ N and it is proven to guarantee delivery for k ≥ 2d−1, if node v is d-locally connected, which means that the set of nodes with distance between 1 and d to v induces a connected subgraph of the communication graph. It is also shown that the number of participating nodes is optimal under the restriction to 1-hop neighborhood information. The protocol is also analyzed in simulations that demonstrate very high success rates for very low values of k. KEYWORD

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In this paper, we proposed a novel efficient method of analyzing the ergodic channel capacity of the cooperative amplify-and-forward (CAF) relay system. This is accomplished by employing a very tight approximate moment generating function (MGF) of end-to-end signal-to-noise ratio of 2-hop multi-relay system, which is In this paper, we proposed a novel efficient method of analyzing the ergodic channel capacity of the cooperative amplify-and-forward (CAF) relay system. This is accomplished by employing a very tight approximate moment applicable to myriad of fading environments including mixed and composite fading channels. Three distinct adaptive source transmission policies were considered in our analysis namely: (i) constant power with optimal rate adaptation (ORA); (ii) optimal joint power and rate adaptation (OPRA); and (iii) fixed rate with truncated channel inversion (TCIFR). The proposed frame work based on the novel approximate MGF method is sufficiently general to encapsulate all types of fading environments (especially for the analysis of the mixed fading case)and provides significant advantage to model wireless system for mixed and composite fading channel. In addition to simplifying computation complexity of ergodic capacity for CAF relaying schemes treated in literature, we also derive closed form expressions for the above three adaptive source transmission policies under Nakagami-m fading with i.n.d statistics. The accuracy of our proposed method has been validated with existing MGF expressions that are readily available for specific fading environments in terms of bounds, and via Monte Carlo simulations.

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Delay optimal broadcast for multihop wireless networks using self-interference cancellation

1. DELAY-OPTIMAL BROADCAST FOR MULTIHOP WIRELESS NETWORKS USING SELF-INTERFERENCE CANCELLATION ABSTRACT: In this paper, we propose a new protocol called Chorus that improves the efficiency and scalability of broadcast service with a MAC/PHY layer that allows packet collisions. Chorus is built upon the observation that packets carrying the same data can be effectively detected and decoded, even when they overlap with each other and have comparable signal strengths. It resolves collision using symbol-level interference cancellation, and then combines the resolved symbols to restore the packet. Such a collision-tolerant mechanism significantly improves the transmission diversity and spatial reuse in wireless broadcast. Chorus’ MAC-layer cognitive sensing and scheduling scheme further facilitates the realization of such an advantage, resulting in an asymptotic broadcast delay that is proportional to the network radius. We evaluate Chorus’ PHY-layer collision resolution mechanism with symbol-level simulation, and validate its network-level performance via ns-2, in comparison with a typical CSMA/CA-based broadcast protocol. Our evaluation validates Chorus’s superior performance with respect to scalability, reliability, delay, etc., under a broad range of network scenarios (e.g., single/multiple broadcast sessions, static/mobile topologies). ECWAY TECHNOLOGIES IEEE PROJECTS & SOFTWARE DEVELOPMENTS OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE CELL: +91 98949 17187, +91 875487 2111 / 3111 / 4111 / 5111 / 6111 VISIT: www.ecwayprojects.com MAIL TO: ecwaytechnologies@gmail.com

Delay optimal broadcast for multihop wireless networks using self-interference cancellation

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