Performance enhancement of space time turbo trellis codes in MIMO channel

Abstract

An effective and practical way to approaching the capacity of multiple input multiple output (MIMO) wireless channels is to employ space-time coding. Space time coding is a coding technique designed to use in a MIMO channel. There are various approaches in coding structures, including space-time turbo trellis codes, space-time block codes and layered space-time codes. Space time turbo trellis codes were presented with recursive structure and were considered as full rate codes in MIMO channel because of the bandwidth efficient nature of Trellis codes, which were used as the component codes in design of space-time turbo trellis codes. The performance of the code was not much enhanced as compared to the component codes but the complexity was increased. Our intended goal is to increase the performance and decrease the decoder complexity. The decoder performance depends on the minimum distance (Dmin), we will try to increase the Dmin through a better design of the component encoders. The feedback and feed-forward polynomials should be searched for better performance of the code, as they have great impact on increasing the Dmin and decreasing the required number of iterations at the decoder. We can increase the performance with better design of an interleaver, which can have the ability to maximize the spread and decorrelation. Permutations would be calculated algebraically by storing only few parameters on the fly. Previous works done to imply turbo codes in MIMO with trellis as a constituent codes failed to give performance comparable to the constituent codes alone .Our intended goal is to achieve the enhanced performance by optimizing the interleaver design