This paper presents a single correlator RAKE receiver for direct sequence code division multiple access (DS-CDMA) systems. In conventional RAKE receivers, multiple correlators are used to despread the multipath signals and then to align and combine those signals in a later stage before making a bit decision. The simplified receiver structure presented here uses a single correlator and single co...

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...

We present a new framework for code-division multiple access (CDMA) communication over fast fading mobile wireless channels. The performance of the RAKE receiver, which is at the heart of existing CDMA systems, degrades substantially under fast fading encountered in many mobile scenarios. Due to the time-varying nature of the fast fading channel, we employ joint time-frequency processing, which...

In this paper, we theoretically analyze the received signal performance during reception by a RAKE receiver at the terminal in wideband DS-CDMA (W-CDMA: wideband code division multiple access) downlink and evaluate the characteristics by a simulation. This theoretical analysis considers the long code and Walsh code used in the WCDMA downlink, signal transmission to many users, and transmission ...

In this paper, we address a performance evaluation of Time Hopping Ultra-Wideband (TH-UWB) transmission with proposed procedures, based on Pulse Position Modulation (PPM) and considering IEEE 802.15.3a Channel Models (CM1, CM2, CM3, CM4). Moreover, a Selective Rake (S-Rake) receiver is designed to counter the effects of multipath fading occurring in UWB channel Models. The TH-UWB signal detecti...

The wideband code-division multiple access (CDMA) concept (FMA2) developed in the European FRAMES project supports variable data rate transmission. The data rate can be altered by changing either the spreading factor or by using multiple spreading codes in parallel. In order to facilitate exible changing of data rate, variable length orthogonal Walsh codes are used for channel separation, follo...

A novel initialization scheme for a constant modulus algorithm RAKE (CMA-RAKE) receiver for frequency-selective fading asynchronous code-division multiple access (CDMA) channels is proposed. The solutions from the minimization of the constrained minimum output energy (CMOE) criterion are adopted as the initialization of the subsequent CMA receivers. The proposed receiver is proven to be near-fa...

A new architecture for power and area efficient rake receivers for a third generation wireless WCDMA system is presented. The proposed approach based on parallel operations of code generators eliminate de-skew blocks of rake receivers and shares several blocks such that compensators, orthogonal variable spreading factor code generators and scrambling code generators among all fingers, which lea...

We study coherent binary direct-sequence code division multiple access (DS-CDMA) systems operating over frequency-selective Nakagami fading channels. In particular a performance comparison between maximal-ratio combining (MRC) and equal-gain combining (EGC) RAKE receivers is considered. For interference limited systems, perfect MRC RAKE receivers can accommodate about 5m=(5m ? 1) more users tha...

Power control possiblities are explored for the downlink of a Time-Division Duplex (TDD) CDMA system while employing three different kinds of multipath diversity combining schemes namely the RAKE, the pre-RAKE [2] and the transmit antenna pre-selection. In the latter two, knowledge of the channel characterstics is employed at the base-station to provide maximum decoupling between users on the d...