Direct-sequence code-division multiple-access (DSCDMA) cellular systems, such as Wideband CDMA (WCDMA), are limited in performance by interference. Several types of Rake Receivers like A-Rake, S-Rake, P-Rake, Adaptive frequency Rake, Time frequency Rake, Conventional MMSE Rake and Adaptive MMSE rake are used for WCDMA. A Beam formerRake receiver can be an effective solution to provide the recei...

Receivers based on channel equalization have proven to be one of the most promising candidates for terminal receivers in wideband code-division multiple-access (WCDMA) downlink. The channel equalizers provide multiple access interference (MAI) suppression, and thus ensure adequate receiver performance even with a high number of active users. However, the performance improvement provided by the ...

This paper deals with a multiuser cancellation detection scheme combined with antenna arrays, for Wideband Code Division Multiple Access (WCDMA) communication systems where different traffic load and different data rate are considered. The proposed receiver, defined as Space TimeSelective Parallel Interference Cancellation detector, is supposed to be used at the base station of a WCDMA communic...

Ultra wideband (UWB) radio is a new wireless technology that uses sub-nanosecond pulses to transmit information, resulting in a bandwidth greater than 1 GHz. The problem of synchronizing a receiver with the incoming signal grows in complexity as the signal bandwidth increases. This paper addresses coarse synchronization in UWB receivers. It analyzes how the design of the correlation process aff...

This chapter aims to introduce optical receivers in general and application of electronic circuits in these receivers then some important parts of these electronic circuits which are the amplifiers are discussed. An attempt has been made in this chapter to provide some useful information about different aspects of the optical communication in our life and the importance of high speed wideband a...

Large-scale multibeam phased array systems suffer from interbeam interference (IBI) that should be canceled either in the analog or digital domain. In wideband such as fifth generation (5G), rejection over a wide bandwidth is challenging to achieve, not only due nonidealities of receiver chain but also properties radio channel. This article presents scalable IBI cancellation (IBIC) scheme at in...

An ultra-wideband impulse receiver capable of detecting sub-200psec pulses is presented. The chip detects a specific zero-crossing of an incoming pulse and mitigates the undesired effects of ringing. The time detection sensitivity of the chip is limited by the jitter of the incoming pulse rather than the pulse width. A mean RMS jitter of 94fsec is recorded, which translates to the localization ...

This thesis investigates the performance of an ultra-wideband (UWB) multipleinput multiple-output (MIMO) multiuser system with near line-of-sight (LOS) channels. Receiver antenna-element separation on the scale of a symbol wavelength ([speed of light]/[symbol rate]) is proposed. Two different antenna array configurations, a two-element linear array and a three-element triangular array, are used...

This paper presents a wideband quadrature radio receiver employing ΔΣ-based A/D-converting channel-select filters (ADCSFs). The output of the quadrature passive mixer is directly connected to the input of the ADCSFs, where a first-order ΔΣ modulator is incorporated into a fourth-order Butterworth channel-select filter (CSF) to provide sufficient dynamic range for a cellular system. A design met...

Highly linear CMOS radio receivers increasingly exploit linear RF V-I conversion and passive down-mixing, followed by an OpAmp based Transimpedance Amplifier at baseband. Due to the finite OpAmp gain in wideband receivers operating with large signals, virtual ground is imperfect, inducing distortion currents. We propose to apply a negative conductance to cancel this distortion. In an RF receive...