Title :
UMTS Dynamic Outer Interleaver Reconfiguration for Indoor Environment Using SOVA Turbo Decoder
Author :
Chaikalis, Costas ; Samaras, Nicholas
Author_Institution :
Dept. of Inf. & Telecommun., TEI of Larissa, Larissa, Greece
Abstract :
Turbo codes performance improves in correlated Rayleigh fading channels using outer block interleaving, but the drawback is complexity and delay. Choosing inappropriate number of columns can cause errors increase. In this case a reconfigurable outer block interleaver with column number optimised for indoor or low range outdoor operating environments can be useful. Simulation results are demonstrated for the four block interleaver configurations specified for UMTS mobile standard. Using different data rates, constant frame length and SOVA turbo decoding algorithm, the advantages of adapting to an optimum number of columns are discussed. Regarding FER the optimum outer interleaver configuration is nearly the same for both SOVA and log-MAP algorithms, whereas regarding BER and low data rates SOVA requires higher number of columns.
Keywords :
3G mobile communication; Rayleigh channels; Viterbi decoding; channel coding; error statistics; indoor radio; interleaved codes; maximum likelihood decoding; turbo codes; BER; FER; SOVA turbo decoder; UMTS mobile standard; bit error rate; constant frame length; correlated Rayleigh fading channel; dynamic outer interleaver reconfiguration; frame error rate; indoor environment; log-MAP algorithm; 3G mobile communication; AWGN; Bit error rate; Channel coding; Decoding; Fading; Indoor environments; Interleaved codes; Turbo codes; Wireless communication; SOVA; UMTS; outer block interleaving; reconfiguration; turbo codes;
Conference_Titel :
Wireless and Mobile Communications, 2009. ICWMC '09. Fifth International Conference on
Conference_Location :
Cannes, La Bocca
Print_ISBN :
978-1-4244-4679-7
Electronic_ISBN :
978-0-7695-3750-4
DOI :
10.1109/ICWMC.2009.42
