Check this out:

Somov, A., Minakov, I., Simalatsar, A., Fontana, G., & Passerone, R. (2009, September). A methodology for power consumption evaluation of wireless sensor networks. In 2009 IEEE Conference on Emerging Technologies & Factory Automation (pp. 1-8). IEEE.

If you search for that article in Google Scholar, you can find more information since that.

Good luck!

You can calculate the energy consumption in each sensor since you are setting the shape and amplitude ofvthe tx signal!