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In this book we present a new approach to cancelling echoes, mostly occurrence in todays telecommunication system due to acoustic coupling between loudspeaker and a microphone. The proposed algorithm is a Modified VSS-NLMS-UM algorithm the popularity of this algorithm due to the solve a conflicting requirement of fast convergence and low misadjustment. Most of the algorithm was design under-modeling scenario the proposed algorithm doesnt require any prior information about acoustic environment. Due to the specific characteristic of this algorithm are equipped with good robustness feature...

Femtocells are low-power, low cost, backward compatible and portable wireless access points that operate in licensed spectrum to connect standard mobile devices to a mobile operator's network using residential DSL or cable broadband connections. Femtocells are taken as a promising option today by mobile operators to improve coverage and provide high-data-rate services in a low cost manner. Femtocells are installed at locations where users are experiencing unsatisfactory radio coverage or they require high-data-rate. There are many technical challenges for femtocells like interference from...