Exploiting UEP in QAM-based BICM: interleaver and code design

Author

Alvarado, Alex ; Agrell, Erik ; Szczecinski, Leszek ; Svensson, Arne

Author_Institution

EMT, Inst. Nat. de la Rech. Sci., Montreal, QC, Canada

Volume

58

Issue

2

fYear

2010

fDate

2/1/2010 12:00:00 AM

Firstpage

500

Lastpage

510

Abstract

In this paper we formally analyze the interleaver and code design for QAM-based BICM transmissions using the binary reflected Gray code. We develop analytical bounds on the bit error rate and we use them to predict the performance of BICM when unequal error protection (UEP) is introduced by the constellation labeling. Based on these bounds the optimum design of interleaver and code is found, and numerical results for representative configurations are presented. When the new design is used, the improvements may reach 2 dB, and they are obtained without any increase on the transceiver´s complexity. We also introduce the concept of generalized optimum distance spectrum convolutional codes, which are the optimum codes for QAM-based BICM transmissions.

Keywords

interleaved codes; quadrature amplitude modulation; transceivers; QAM-based BICM transmissions; binary reflected Gray code; bit error rate; code design; constellation labeling; generalized optimum distance spectrum convolutional codes; interleaver; optimum design; quadrature amplitude modulation; transceiver complexity; unequal error protection; Bit error rate; Convolutional codes; Error correction codes; Euclidean distance; Interleaved codes; Labeling; Modulation coding; Performance analysis; Quadrature amplitude modulation; Reflective binary codes; BICM, interleaver design, multiple interleavers; optimum distance spectrum codes, QAM, UEP;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2010.02.080525

Filename

5407616