Bit-to-symbol mapping in LDPC coded modulation

Yuan Li, Chin Keong Ho, Yan Wu, S. Sun

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

5 Citations (Scopus)
2 Downloads (Pure)


Various bit-to-symbol mapping schemes are studied in an M-ary modulated system applying low-density parity-check (LDPC) code. By examining different assignment methods of LDPC codeword to two parallel channels with unequal signal-to-noise ratio (SNR), we find out that it is better to assign systematic bits of LDPC codeword to channels with higher SNR, even for regular LDPC code. Therefore, it is more advantageous to map as many systematic bits in LDPC codeword as possible to more significant bits (MSB) of the signal constellation in a LDPC coded M-ary modulation system. The performance gain achieved by this mapping scheme comes at no extra cost in power, rate and complexity.
Original languageEnglish
Title of host publication2005 IEEE 61st vehicular technology conference, VTC2005-spring Stockholm : paving the path for the future : 30 May - 1 June 2005, Stockholm, Sweden
Place of PublicationNew York
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Print)0-7803-8887-9
Publication statusPublished - 2005
Event61st Vehicular Technology Conference (VTC 2005-Spring) - Stockholm, Sweden, Stockholm, Sweden
Duration: 30 May 20051 Jun 2005
Conference number: 61


Conference61st Vehicular Technology Conference (VTC 2005-Spring)
Abbreviated titleVTC 2005-Spring


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