Abstract: Orthogonal frequency division multiplexing (OFDM) technique is a promising technique to offer high data rate and reliable communications over fading channels. The main implementation disadvantage of OFDM is the possibility of high peak to average power ratio (PAPR). This paper presents a novel technique to reduce the PAPR using turbo coding and selective mapping (SLM). We show that the prob-ability of the PAPR of OFDM signal with 128 subcarriers exceeding 7 dB can be reduced from 70% to 0.25% with bit error rate (BER) of 6 × 10−5 at signal to noise ratio (SNR) 4 dB

• Publication Date: 12-Mar-2012
• DOI: 10.15224/978-981-07-1847-3-916
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Abstract: In the past many years different types of routing protocols, single-path and Multipath, have been designed for wireless sensor network. We have also found various multipath routing protocols available that send similar data to base station via multiple paths to increase reliability. We have found that a new simulation environment Castalia is developed based on OMNET++. They have provided implementation of Multipath rings routing protocol. We found that it is based on technique called Synopsis Diffusion. We observed that although implementation of protocol is there, detail understanding of the technique is not available in a literature. Hence, in this paper we have discussed Multipath rings routing protocol for wireless sensor network implemented by Castalia Simulator. Here, we have also, evaluated performance (and hence verified its working) of Multipath rings routing protocol through simulation. We have taken a view that, Multipath rings routing protocol can route the packet from sour

• Publication Date: 12-Mar-2012
• DOI: 10.15224/978-981-07-1847-3-924
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• Downloads: 0