Abstract-In this paper, we propose a low complexity detection scheme for MIMO systems incorporating spatial multiplexing. Optimal detection schemes such as maximum-likelihood (ML) detection of MIMO signals demands computational resources that are beyond the capabilities of most practical systems. Alternative reduced complexity MIMO detection techniques have been proposed, but the complexity of algorithmic schemes are in general much higher than that of the equalizer-based techniques, e.g. zero-forcing (ZF) or MMSE. On the other hand, equalizerbased techniques perform relatively poor in terms of error rate. In this paper, we propose a hybrid of an equalizer-based technique and an algorithmic search stage. Based on an error matric and its probability density functions for different classes of error, a particular search region is selected for the algorithmic stage. As the probability of occurrence of error classes with larger search regions is small, overall complexity of the proposed technique remains low while providing a significant improvement in the error performance.
Polymer waveguides have long been of interest for low cost integrated optical devices. Inorganic Polymer glasses are a class of materials based around polysiloxanes which have many attractive features for low cost integrated optics and meet the stringent reliability requirements for deployment in carrier networks. The inorganic polymer glasses available for this work are normally patterned as negative photoresists but this leads to a resolution limit on the achievable feature size due to free radical diffusion. Therefore we demonstrate here high quality dry etching of these materials using standard photoresist masking and the fabrication of small high index contrast waveguides with losses marginally higher than the intrinsic materials losses.
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