Abstract
This chapter investigates the use of differentially encoded (DE) modulations concatenated with low-density parity-check (LDPC) codes. The chapter is logically divided in two parts. In the first part of this chapter (from Section 7.2 till Section 7.5), we discuss the approach to the design of DE-LDPC coded scheme originally proposed in [79]. Adopting the optimization technique described in Section 5.6, we show a method to design good LDPC codes for DE modulations. We analyze the optimized codes, gaining insights into their graph structures and highlighting the differences between LDPC codes for DE modulations and standard LDPC codes, i.e., optimized for transmission over a memoryless channel. We consider the concatenation of an LDPC code with a differential modulator for both phase shift keying (PSK) and quadrature amplitude modulation (QAM).
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© 2009 Springer-Verlag Berlin Heidelberg
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(2009). LDPC Codes and Differential Modulations. In: LDPC Coded Modulations. Signals and Communication Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-69457-1_7
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DOI: https://doi.org/10.1007/978-3-540-69457-1_7
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-69455-7
Online ISBN: 978-3-540-69457-1
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