Serially concatenated LT code with DQPSK modulation
2011 (English)In: Wireless Communications and Networking Conference (WCNC), 2011 IEEE, 2011, 1811-1816 p.Conference paper (Refereed)
We consider serial concatenation of a Luby Transform (LT) code with a differential quadrature phase-shift-keying (DQPSK) modulator for transmission over an additive white Gaussian noise (AWGN) Channel. Assuming a target average rate for the operation of the rateless LT DQPSK scheme, the degree distribution of the LT code is optimized in terms of convergence threshold using extrinsic information transfer (EXIT) charts. From the EXIT chart analysis, we show that the proposed LT DQPSK scheme has a similar convergence performance, but lower complexity, as compared to a Raptor code with differential modulation, and a LDPC code optimized for DQPSK. The EXIT chart analysis framework is also applied to evaluate the throughput performance for the three schemes in terms of the average code rate as a function of the signal-to-noise ratio. The comparison demonstrates that the proposed structure is well-suited for adaptive-rate transmission over a wide range of rates.
Place, publisher, year, edition, pages
2011. 1811-1816 p.
AWGN channel;DQPSK modulation;DQPSK modulator;EXIT chart analysis;LDPC code;Luby transform code;Raptor code;adaptive-rate transmission;additive white Gaussian noise channel;average code rate;convergence performance;convergence threshold;degree distribution;differential modulation;differential quadrature phase-shift-keying modulator;extrinsic information transfer;rateless LT DQPSK scheme;serially concatenated LT code;signal-to-noise ratio;throughput performance;AWGN channels;adaptive codes;concatenated codes;differential phase shift keying;parity check codes;quadrature phase shift keying;transform coding;
IdentifiersURN: urn:nbn:se:kth:diva-52464DOI: 10.1109/WCNC.2011.5779408ISI: 000297160200310ScopusID: 2-s2.0-79959314152OAI: oai:DiVA.org:kth-52464DiVA: diva2:466854
QC 201201132011-12-162011-12-162012-04-03Bibliographically approved