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On the Design of Interleavers for BICM Transmission

Alex Alvarado (Institutionen för signaler och system, Kommunikationssystem) ; Leszek Szczecinski ; Erik Agrell (Institutionen för signaler och system, Kommunikationssystem) ; Arne Svensson (Institutionen för signaler och system, Kommunikationssystem)
Proceedings European Wireless Conference 2008, EW2008, Prague, Czech Republic (2008)
[Konferensbidrag, refereegranskat]

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!

Denna post skapades 2008-06-02. Senast ändrad 2016-04-28.
CPL Pubid: 71361


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Institutioner (Chalmers)

Institutionen för signaler och system, Kommunikationssystem



Chalmers infrastruktur