| In this paper we consider an asyn-chronous direct-sequence code division multiple access (DS-CDMA) communication system operating over an AWGN channel. In certain applications , the near-far problem can be the limiting factor for the capacity of a DS-CDMA system. Several near-far resistant receivers have therefore been proposed (e.g., the decorrelat-ing receiver). These receivers assume perfe...

introduction: evaluation of students’ learning in clinical education system is one of the most important and challenging issues that facilities in this field have been facing. the present study aimed to evaluate the role of feedback during evaluation in increasing emergency medicine residents’ clinical skills. method: the present experimental study was performed on all second year emergency med...

| 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...

Approximate maximum-likelihood noncoherent sequence detection (NSD) for differential space–time modulation (DSTM) in time-selective fading channels is proposed. The starting point is the optimum multiple-symbol differential detection for DSTM that is characterized by exponential complexity. By truncating the memory of the incremental metric, a finite-state trellis is obtained so that a Viterbi ...

A high speed optical wireless-fiber solution was proposed in part I of this research with applications such as network backhaul and data center links. The system is based on the utilization state-of-the-art modulation multiplexing techniques fiber wireless communications, including multicore fibers (MCFs) coherent detection Kramer-Kronig (KK) receivers. In letter, we analyze performance compare...

The processing that is often employed in receivers for quaternay direct-sequence spread-spectrum communications operates separately on the inphase and quadrature components of the spread-spectrum signal. Recent results on quaternary complex sequences, which are also referred to as four-phase sequences, provide a strong motivation to emplo~ processing methods that permit the receiver to benefit ...

03/12/1027 Introduction Zero-IF receivers are not new; they have been around for some time and are prominently used in cell phone handsets. However their use in high performance wireless base stations has had limited success. This is due primarily to their limited dynamic range and that they are less well understood. A new wide bandwidth zero-IF IQ demodulator helps relieve the dynamic range an...

Direct-conversion receivers (DCRs), also known as zero-IF or homodyne receivers, have received significant attention over the last decade and have become a popular alternative to the classical heterodyne architecture (which has dominated receiver topologies for more than 70 years) in the development of RF integrated circuits (ICs) for wireless applications. Rather than downconverting to a finit...

The double balance mixer scheme in-phase signal input and double-quadrature Local Oscillator (LO) is suggested for application on IQ direct conversion receivers. The influence of the gain and phase mismatches of splitters is investigated. It is shown that a similar scheme using square-law detectors is promising on optical applications. Introduction The increasing interest in direct conversion r...

Any communication channel will usually distort the transmitted signal. This is especially true in the case of mobile systems, where multipath propagation causes the received signal to be seriously degraded. Over the years, many techniques have been proposed to combat channel effects. Two of the most popular are linear equalisation (LE) and decision feedback equalisation (DFE). These methods off...