Title :
Improving the bandwidth efficiency and of CPM signals via shaping and iterative detection
Author :
Kuo, Chun-Hsuan ; Chugg, Keith M.
Author_Institution :
Dept. of Electr. Eng.-Syst., Southern California Univ., Los Angeles, CA
Abstract :
In this paper, we investigate the effects of shaping on the bandwidth efficiency and performance of continuous phase modulated (CPM) signals. We show that, theoretically, by properly shaping the unmodulated signal, better bandwidth efficiency and performance can be obtained. We then develop the soft-input soft-output (SISO) de-shaper for trellis shaping and block shaping schemes. For a coded, shaped CPM system, the SISO de-shaper enables joint decoding and de-shaping via iterative detection. We demonstrate that using the SISO deshaper, together with iterative decoding and de-shaping, the theoretical advantage of shaping can be realized with practical complexity
Keywords :
bandwidth allocation; block codes; iterative decoding; phase modulation; signal detection; trellis coded modulation; CPM signals; bandwidth efficiency; block shaping schemes; continuous phase modulated signals; decoding; iterative detection; soft-input soft-output deshaper; trellis shaping schemes; AWGN; Bandwidth; Continuous phase modulation; Frequency modulation; Iterative decoding; Phase shift keying; Pulse amplifiers; Pulse modulation; Quadrature amplitude modulation; Signal to noise ratio;
Conference_Titel :
Military Communications Conference, 2005. MILCOM 2005. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-9393-7
DOI :
10.1109/MILCOM.2005.1605747
