3G mobile communications is advanced and emerging technology in the field of wireless communication also providing facilities like multimedia accessing, internet services, higher capacity of data rates and multiple services for same connection. The Rake receiver involves descrambling, dispreading, channel estimation and fading cancellation. The main principle behind Rake receiver is that they e...

In this paper, we propose a multiuser detection (MUD) scheme for space-time block coded orthogonal frequency division multiplexing (STBC-OFDM) systems. We derive the optimum weight matrix used to decouple simultaneously signals from active multiple access users using the minimum mean square error (MMSE) multiuser detection method. The proposed scheme provides good performance over different mod...

This paper models and analyzes the performance of TCP (Transmission Control Protocol) under joint rate and power adaptation with constrained BER (Bit Error Rate) requirements for downlink data transmission in a multi-cell VSF (Variable Spreading Factor) WCDMA system. The performance of TCP in a wide area Internet environment is evaluated by using computer simulation considering both random user...

This letter shows how physical phenomena affecting radio communication can be exploited to turn any wireless network into a wireless sensor network for motion detection without any actual sensing hardware. Motion of individuals or objects in the network area produces shadowing and multipath fading effects altering the received signal strength. The ability to measure signal strength, which wirel...

Suppression of multiuser interference (MUI) and mitigation of multipath effects constitute major challenges in the design of thirdgeneration wireless mobile systems. Most wideband and multicarrier uplink CDMA schemes suppress MUI statistically in the presence of unknown multipath. For fading resistance, they all rely on transmitor receivediversity and multichannel equalization based on bandwidt...

_______________________________________________________________________ Signal Fading can drastically affect the performance of terrestrial communication systems. Fading caused by multipath propagation can degrade the bit-error-rate (BER) performance of a digital communication system resulting data loss or dropped calls in a cellular system. So it is essential to understand the nature of multip...