Optical Code Division Multiple Access Essay Example for Free

Optical Code Division Multiple Access EssayQuestion write more or less Optical Code Division Multiple Access. Introduction and overview, historical background, explanation of the proficiency, comparison between FDMA, TDMA and OCDMA, explain more on OCDMA, how does it work, why using OCDMA, advantages, what opposite techniques available other than OCDMA, compare them with OCDMA.IntroductionOCDMA is a multiple access technique originating from DS-SS (Direct Sequence Spread Spectrum) and it was originally white plagued for military purposes to ensure that transmittance of information I kept safe. It is currently used in wireless communication such as mobile devices. OverviewHere we are going to guess at the OCDMA technique, how it works, its origin or background, its advantages and compare it with other techniques.HistoryIt started in 1941 when George Antheil and Hedy Lamar patented Spectrum communication but it was not implemented then. CDMA was later considered in the late 7 0s for cellular mobiles. During this period, CDMA technology was being used for military communications to ensure that there is security in information transmission. It is now a very important technology widely used in wireless communication as 3G/4G Technology.Explanation of the TechniqueOCDMA is a technique which employs high move transmission, exchange of selective information using optical signal processing to realize an all optical communication and networking. Users access the network randomly. It uses a tell-to go communications protocol and can support different bitrate traffic. It transmits encrypted information making it secure Comparison between FDMA, TDMA and OCDMAOCDMA is different and advantageous as compared to FDMA and TDMA in that it ensures there is proper use of communication media by giving asynchronous access to every user. In OCDMA technique new users are added to the network with ease because it does not require any(prenominal) scheduling. OCDMA has been kno wn to experience problems as it suffers from different kinds of noise as a result of multiple access interference (MAI). Advantages of OCDMAAllows frequency reuseProvides Variable data ratesAllows asynchronous multiple accessProvides protection from interferenceGives resistance to interception in that no unauthorized listeners can decode the original message another(prenominal) TechniquesOFDMA-This was developed for cable networks which had the problems of narrow band jamming. OFDMA is used for terrestrial video and radio broadcasting. OFDMA was originally designed for cable networks whereas OCDMA is used for wireless communication. WDMA-This is another technique which allows access of channels based on wave-length division multiplexing. It can allow numerous data signals to share a common communication channel. The OCDMA uses fewer devices than WDMA.References internationalistic Engineering Consortium. (2005). Annual review of wireless communications. Chicago, Ill Professional Educ ation International.