Title :
MAP-algorithm with fixed-point representation for software radios
Author :
Wiesler, Anne ; Muller, Olivier ; Jondral, Friedrich
Author_Institution :
Inst. fur Nachrichtentechnik, Karlsruhe Univ., Germany
Abstract :
The international mobile communication system IMT2000 will enable very flexible communication, which means variable data rates from 8 kbit/s speech up to 2 Mbit/s for data transmission. In November 1999 five modes of IMT2000 have been specified. In several modes turbo codes are proposed to enable bit error rates (BER) as low as 10-6 for high quality data services. Usually for this type of channel coding two MAP-algorithms, based on the maximum a posteriori criterion, are used for decoding. The MAP-algorithm utilizes soft input information and produces soft output information. The practical implementation of the MAP-algorithm, respectively its computational reduced version log-MAP and max-log-MAP, is investigated
Keywords :
cellular radio; channel coding; concatenated codes; convolutional codes; data communication; decoding; fixed point arithmetic; radio receivers; software architecture; turbo codes; voice communication; 2 Mbit/s; BER; GSM; IMT2000; MAP-algorithm; UTRA-FDD receiver; bit error rates; channel coding; concatenated convolutional codes; data services; data transmission; decoding; fixed-point DSP; fixed-point representation; international mobile communication system; log-MAP; max-log-MAP; maximum a posteriori criterion; parallel computing; soft input information; soft output information; software radios; speech transmission; turbo codes; variable data rates; Bit error rate; Channel coding; Communication system software; Convolutional codes; Decoding; Digital signal processing; GSM; Mobile communication; Software radio; Turbo codes;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.886858
