Serially Concatenated LT Code With DQPSK Modulation

The authors 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 rate-less 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, they 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.

Provided by: Institute of Electrical & Electronic Engineers Topic: Mobility Date Added: May 2011 Format: PDF

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