  Scalar Quantize & Forward (QF) schemes are studied for the Two-Way Relay
Channel. Different QF approaches are compared in terms of rates as well as
relay and decoder complexity. A coding scheme not requiring Slepian-Wolf coding
at the relay is proposed and properties of the corresponding sum-rate
optimization problem are presented. A numerical scheme similar to the
Blahut-Arimoto algorithm is derived that guides optimized quantizer design. The
results are supported by simulations.
