Title :
Power and bandwidth efficient serially concatenated CPM with iterative decoding
Author :
Oqvist, P.M. ; Aulin, T.
Author_Institution :
Dept. of Comput. Eng., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
Serially concatenated continuous phase modulation (SCCPM) with iterative decoding is analyzed and simulated. Earlier results on outer rate 1/2 convolutional codes combined with inner binary and quaternary CPM systems are extended to rate 2/3 and 3/4 codes with low-complexity octal and hexadecimal CPM systems, having the 2RC and 3RC frequency pulses. Analysis and simulations show that-among the evaluated systems-the octal 2RC systems provide the highest power/bandwidth efficiency. As an example, rate 2/3-coded octal 2RC with modulation index 1/4 provides a 5.7 dB gain over uncoded minimum shift keying at a bit error rate of 10-3 and an input delay 4096 bits, without any bandwidth expansion
Keywords :
concatenated codes; continuous phase modulation; convolutional codes; error statistics; iterative decoding; modulation coding; bandwidth efficient serially concatenated CPM; bit error rate; continuous phase modulation; frequency pulses; inner binary CPM systems; inner quaternary CPM systems; input delay; iterative decoding; low-complexity hexadecimal CPM systems; low-complexity octal CPM systems; modulation index; outer convolutional codes; power efficient serially concatenated CPM; simulations; uncoded minimum shift keying; Analytical models; Bandwidth; Bit error rate; Concatenated codes; Continuous phase modulation; Convolutional codes; Delay; Frequency; Gain; Iterative decoding;
Conference_Titel :
Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-6451-1
DOI :
10.1109/GLOCOM.2000.891247
