Title :
A new metric for BER evaluation in APP decoders with space diversity
Author :
Lopez-Salcedo, Jose A. ; Lamarca, Meritxell
Author_Institution :
Dept. of Signal Theor. & Commun., Univ. Politecnica de Catalunya, Barcelona, Spain
Abstract :
We propose a new metric which summarizes in a single parameter most of the information required to infer the BER of a turbo code (TC) in a Rayleigh multiple-input multiple-output (MIMO) channel. This metric relies on the measurement of the mean and variance of the log-likelihood ratios (LLRs) at the TC output and it is shown to provide a one-to-one relationship with the BER. Thus, this metric can be used to monitor the quality-of-service (QoS) and detect the need of changing the transmission mode in a reconfigurable system with adaptive modulation and coding (AMC).
Keywords :
MIMO systems; Rayleigh channels; adaptive codes; adaptive decoding; adaptive modulation; channel coding; diversity reception; error statistics; quality of service; turbo codes; AMC; APP decoders; BER; MIMO channel; QoS; Rayleigh channel; adaptive modulation-and-coding; bit error rate; log-likelihood ratio; multiple-input multiple-output; quality-of-service; reconfigurable system; space diversity; turbo code; Adaptive systems; Bit error rate; Error analysis; Extraterrestrial measurements; Iterative decoding; MIMO; Modulation coding; Monitoring; Receiving antennas; Turbo codes;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2004 IEEE 5th Workshop on
Print_ISBN :
0-7803-8337-0
DOI :
10.1109/SPAWC.2004.1439202
