I want to reduce the energy at the time of transmitting the data from nodes to base station. I want to use multihop method by using relays.
In order for a transmitter and receiver pair to communicate, the required transmitting
power Pt changes exponentially with the distance and thus significant energy saving can be achieved by reducing
the sensor transmitting power and by enabling multihop communication. You can use amplify-and-forward
(AF) relays which has been considered to be suitable for wireless sensor networks that require low complexity nodes however, have shown that the transmitting signals from the relay with AF cooperation tend to suffer from high peak
power, which is even prohibitive when the power amplifier efficiency at the relay is of primary concern. Note that power amplifier actually dominates the power consumption of radio frequency circuit. Therefore, the DF relay may be considered more beneficial in practice.
Do you ask about the cooperative transmission protocols? There is a plethora of papers regarding cooperative tranmsission in the technical litearature.
Co-operative transmission protocols r proposed for wireless broadcast channels, a fundamental building block of wireless communication networks. The concepts of cognitive radio and precoding have been introduced to broadcast channels in order to improve system performance. Information theoretic metrics, such as outage probability and diversity-multiplexing tradeoff, are developed to facilitate performance evaluation. In the absence of direct S-D links, the proposed protocols can achieve a multiplexing gain close to one, whereas the traditional two-hop scheme only achieves a diversity gain of 1/2.
@Narendrakumar -- this is not an answer, but your question suggested that you want to reduce transmission power through multi-hop networking. If your goal is power reduction (e.g. extending battery life), you should know that many short-range radios consume more power while receiving than while transmitting, so any power-aware protocol needs to take that into consideration.
This publication describes a simple cooperative diversity scheme with energy consumption analysis: https://www.researchgate.net/publication/224175477_Dynamic_Single_Frequency_Networks_in_Wireless_Multihop_Networks_-_Energy_Aware_Routing_Algorithms_with_Performance_Analysis
Conference Paper Dynamic Single Frequency Networks in Wireless Multihop Netwo...
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