On the design of interleavers for BICM transmission

A. Alvarado, L.L. Szczecinski, E. Agrell, A.B. Svensson

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


In this paper we design interleavers for bit-interleaved coded modulation (BICM) based on popular convolutional codes and quadrature amplitude modulation with Gray mapping. We analyze the so-called modular interleavers where the outputs of the convolutional encoder are appropriately matched with the input bits of the modulator. To quantify the achievable improvements we develop bounds on the coded BER using the multidimensional weight distribution spectrum of a code together with an equivalent QAM channel model. Based on these bounds, we show that the assignment of the encoder’s output to the bit positions in the symbol significantly affects the system performance. The analytical developments are contrasted with numerical simulations. The improvements obtained through the proposed approach do not change the receiver’s complexity and, depending on the system’s parameters (rate, modulation, code’s memory), they may be up to 1.7 dB!
Original languageEnglish
Title of host publication14th European Wireless Conference (EW) 2008
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Print)978-3-8007-3102-2
Publication statusPublished - Jun 2008
Event14th European Wireless Conference (EW 2008) - Prague, Prague, Czech Republic
Duration: 22 Jun 200825 Jun 2008
Conference number: 14


Conference14th European Wireless Conference (EW 2008)
Abbreviated titleEW 2008
Country/TerritoryCzech Republic


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