PROJECT TITLE :

Highly Efficient Multi-Hop Packet Transmission Using Intra-Flow Interference Cancellation and Maximal-Ratio Combining

ABSTRACT:

Standard Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) multi-hop transmission suffers severely from intra-flow interference (IFI) in dense traffic, because of the hidden terminal (HT) downside. We have a tendency to propose a non-CSMA/CA multi-hop transmission theme with IFI-canceler (IFIC) that can efficiently relay packets below high traffic hundreds in fading environments. This interference cancellation technique employs adaptive equalization with a normalized least mean square (NLMS) algorithm for channel estimation and has smart BER/PER performance below a wide range of SNR and SIR conditions. It is additionally capable of canceling multiple interference sources. A multi-hop packet transmission frame format dedicated to the IFIC proposal is meant. An analysis model is made that considers doable outage events in multi-hop traffic flows. Simulations of multi-hop transmission indicate that IFIC throughput beneath slow Rayleigh fading linearly increases with traffic load and is three.five times beyond that of current CSMA/CA systems at the highest normalized traffic load. When 2-branch maximal-ratio combining (MRC) reception is added after IC, the throughput is further improved to a level very shut to the theoretical most for additive white Gaussian noise (AWGN) channels. We tend to conjointly assess the impact of maximum Doppler frequency, and show that the best performance is maintained if the frequency is less than ten Hz and the performance under higher Doppler frequencies will be effectively improved by retransmission.


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