High-speed downlink packet access (HSDPA) has been developed to upgrade the current WCDMA system in yerms of providing a higher data rate for mobile users. To ensure a downlink speed of up to 14Mbps, the HSDPA system has three main features: adaptive modulation and coding, a hybrid automatic repeat request, and fast scheduling. Because standard documents describe only the specifications of Node...

In this paper, a robust adaptive MMSE Rake-equalizer receiver scheme is presented with channel estimation that has been transmitted in Direct Sequence-Ultra Wideband (DS-UWB) system. The DS-UWB has a fine path resolution by transmitting information with ultra short pulses. The Rake receiver is known as a technique that can effectively combine paths with different delays and obtain the path dive...

The performance of DS-UWB and TH-UWB for a single-user link is compared for a data rate of 100 Mbps using the newly proposed, realistic UWB channel model from IEEE P802.15. The performance of suboptimal, fractionally spaced (FS), coherent Rake receivers with a pulse matched filter is evaluated with numerical simulations when different channel estimation algorithms, suitable for coherent detecti...

The error rate link performance has been evaluated and compared for efficient Rake receiver structures in low data rate WBAN (Wireless Body Area Network) channel. Rayleigh and Weibull distributions have been used for generating fading power profiles. This model is based on extensive measurements inside or on the surface of human body. The power profiles for WBAN channel have been generated. The...

Abstruct: Standard spread-spectrum techniques encounter a severe performance loss under channels with large doppler spread. It is shown that the novel spreadspectrum technique, called multi-canier (MC) CDMA, is dual to direct-sequence CDMA. This enables to derive that MC-CDMA is a signalling technique which allows optimum detection under severe doppler spread. The receiver for this is a RAKE re...

| Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant single-user receivers in direct-sequence code-division multiple-access (DS-CDMA) systems. A mod-iied version of the receiver, called LMMSE-RAKE receiver , has previously shown promising performance in frequency-selective fading channels. In this paper, both the convergence and BER performance of an ad...

In this paper the CMOE detector proposed in 111 is modified to cope with a varying SNR of the signal of interest in a multi-user environment. The detector is applied to a DS-CDMA system, where several users transmit data simultaneously and asynchronously over a noisy, frequency selective power-line channel. A comparison is performed between the improved CMOE detector and a RAKE receiver for a n...

A coherent rake combiner is employed as the channel matched filter in a DS-CDMA mobile radio. However, as the number of propagation paths increases, the coherent rake receiver incurs a serious degradation in the bit error rate (BER) performance due to severe inter-path interference (IPI). In this paper, frequency-domain equalization employed in multi-carrier code division multiple access (MC-CD...

In This paper comparison results are presented for receiver used for UWB communication system .we have taken in to account of impact of all the parameter such as Rake fingers and equalization tap on the error performance and SNR. Rake receivers can be employed since they are able to provide multipath diversity .another aspect is to combate the inter-symbol-interference(ISI) ,this distorts the t...