Inter-Symbol Interference Reduction on Macro-Sequences Generated from Complementary Set of Sequences

The encoding of emissions by complementary sets of sequences is usually used in communications and multi-sensor systems where asynchronous detection is required. These sets of sequences have ideal properties in the addition of their autocorrelation and cross-correlation functions. Furthermore, it is possible to obtain efficient correlation algorithms that reduce the hardware complexity, allowing real-time signal processing. Nevertheless, because more than one sequence is assigned to a user, it is necessary to design efficient emission schemes to emit in the smallest time the assigned code. A simple method consists in setting an emission order of the sequence bits - for example interleaving their bits or linking the sequences. Thus, a new code or sequence called "macro-sequence" is generated which can be emitted by a simple two-phase modulation. Nevertheless, with this method, the correlation properties of the obtained macro-sequence are not ideal. In this work a post-process algorithm for the macro-sequence correlation is developed in order to reduce the degradation effect that the emission procedure introduces, improving its detection