Seminar Details
2009-11-24 (14.00) : Rate-Optimized Power Allocation for Relayed OFDM transmission in different scenarii
At Euler building
Organized by Mathematical Engineering
Speaker :
Vandendorpe, Luc
Abstract :
We consider an OFDM (orthogonal frequency division multiplexing) point-to-point transmission scheme which is enhanced by
means of a relay. Symbols sent by the source during a first time slot may be (but are not necessarily) retransmitted by the relay
during a second time slot. The relay is assumed to be of the DF (decode-and-forward) type. For each relayed carrier, the destination
implements maximum ratio combining. Two protocols are considered. Assuming perfect CSI (channel state information), the
paper investigates the power allocation problem so as to maximize the rate offered by the scheme for two types of power constraints.
Both cases of sum power constraint and individual power constraints at the source and at the relay are addressed. The theoretical
analysis is illustrated through numerical results for the two protocols and both types of constraints.
Then the case where multiple relays are active will be considered. Finally a multiple access scheme with 2 users will be discussed.