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In this paper the VLC related CDM problems are discussed, focusing on the asynchronous mode CDM which is more suitable for a simple VLC system. The description of the most common code set types, the unipolar OOCs and bipolar PN codes, showed the benefits, disadvantages and possibilities of these codes. Obtaining information about a CDM channel quality is not as easy as measuring RSS on a single RF signal. It was showed that the most common quality indicator measure, the crest factor, may be misleading in some cases. A possible solution is proposed for this problem, introducing two novel advanced quality indicator (AQI) measures. Computing these new measures along with the crest factor gives a better approximation to the CDM channel quality. With AQI1 the noise immunity of a CDM transmission using Gold codes and OOCs are compared, in function of the code length. These AQIs, for example, may improve the precision of a channel quality based VLC CDM indoor positioning system, and allows more reliable practical comparison between various code sets.

Methodology for DNS Cache Poisoning Vulnerability Analysis of DNS64 Implementations