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• W1857788313 abstract "This chapter introduces cellular code division multiple access (CDMA) communications technology in cellular systems and explores single-user detection techniques. In the CDMA scheme, each user is assigned a unique code sequence. The cellular structure of a wireless network consists of clusters of cells. Each cell consists of a transceiver at the fixed base station with suitable transmitting power and a number of mobile units scattered within the coverage area of the cell. Each mobile unit operates a transceiver comprising of a sensitive receiver and a low power transmitter operating in a wireless environment characterized by multipath propagation, fading, and access interference. A phenomenon that degrades the service quality of a wireless network is the Near–Far (N-F) effect, which occurs when the interference from a user transmitting near the base station overpowers the weaker signal received from a distant user. This can be combated by using a tight power control scheme or by using N-F resistant receiver designs. The other main source of performance degradation is the interference generated by multiple users' access from within the user cell or from adjacent cells. Single-user receivers operating in a mobile wireless channel have to be adaptive to the time-varying channel states to optimize performance. The adaptive receiver consists of a digital FIR filter whose coefficients are computed according to the (MMSE) minimum mean square error criterion and an adaptation algorithm is used to continually adjust these coefficients." @default.
• W1857788313 created "2016-06-24" @default.
• W1857788313 creator A5082148720 @default.
• W1857788313 date "2007-01-01" @default.
• W1857788313 modified "2023-09-23" @default.
• W1857788313 title "Cellular Code Division Multiple Access (CDMA) Principles" @default.
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• W1857788313 doi "https://doi.org/10.1016/b978-075065252-0.50007-7" @default.
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