Serially concatenated continuous phase modulation with low density generator matrix codes

Author

Xiao, Miag ; Aulin, Tor

Author_Institution

Dept. of Comput. Eng., Chalmers Univ. of Technol., Goteborg, Sweden

fYear

2005

fDate

5-8 June 2005

Firstpage

76

Lastpage

80

Abstract

We propose a new scheme of serially concatenated continuous phase modulation (SCCPM) by using nonsystematic low density generator matrix (LDGM) codes as the outer code. We use the EXIT chart/function to optimize the LDGM codes. We also show the EXIT function for CPM when the SNR (signal-to-noise-ratio) is fixed. A property of the LDGM code degree is investigated. The union bound is used to analyze the error floor. Numerical results show that this scheme converges earlier (lower SNR) than previous considered SCCPM schemes for iterative decoding.

Keywords

concatenated codes; continuous phase modulation; iterative decoding; matrix algebra; modulation coding; parity check codes; phase coding; EXIT function; LDGM code optimization; SCCPM; extrinsic information transfer; iterative decoding; low density generator matrix; serially concatenated continuous phase modulation; AWGN; Bit error rate; Concatenated codes; Continuous phase modulation; Iterative algorithms; Iterative decoding; Modulation coding; Parity check codes; Phase modulation; Telecommunication computing;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications, 2005 IEEE 6th Workshop on

Print_ISBN

0-7803-8867-4

Type

conf

DOI

10.1109/SPAWC.2005.1505875

Filename

1505875