A practical forwarding scheme for wireless relay channels based on the quantization of log-likelihood ratios

This paper considers a wireless relay network with one source, one relay, and one destination. We propose a low-complexity quantize-and-forward (QF) scheme in which the relay calculates log-likelihood ratios (LLRs) for the code bits transmitted by the source and passes quantized versions of these LLRs on to the destination. The destination combines the LLRs from the sourcedestination link and the quantized LLRs from the source-relay link to obtain improved information bit estimates. We verify the usefulness of the proposed scheme via numerical simulations in block and fast fading.

• Type: Conference
• Year: 2010
• Where: ICASSP
• Authors: Stefan Schwandter, Gerald Matz
• Keywords: ICASSP 2010, Log-likelihood Ratios, Relay, Signal Processing, Wireless Relay Network