Garcia Marques, AntonioDigham, Fadel F.Giannakis, Georgios B.2009-06-222009-06-222006-06-01http://hdl.handle.net/10115/2237In response to the growing demand for low-cost low-power wireless sensor networks and related applications,we develop bit and power loading algorithms that minimize transmit-power for orthogonal frequency division multiplexing (OFDM) under rate and error probability constraints.Our novel algorithms exploit one of three types of channel state information at the transmitter (CSIT): deterministic (per channel realization)for slow fading links, statistical (channel mean) for fast fading links, and quantized (Q-) CSIT whereby a limited number of bits are fed back from the transmitter to the receiver. By adopting average transmit-power as a distortion metric, a channel quantizer is also designed to obtain a suitable form of Q-CSI. Numerical examples corroborate the analytical claims and reveal that significant power savings result even with a few bits of QCSIT.enTelecomunicacionesinfo:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess3325 Tecnología de las Telecomunicaciones