The ohio state university, 2002 philip schniter, adviser we consider a downlink dscdma system in which multirate user signals are transmitted via synchronous orthogonal short codes overlaid with a common scrambling sequence. Adaptive chiprate equalization of downlink multirate wideband cdma by adam r. A general multipathfading channel model is assumed. Wcdma is a thirdgeneration mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in todays market. Pdf effect of baseband clipping in wideband cdma system. Wcdma is a thirdgeneration 3g mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices. Live endtoend communication tests between a handset and wcdma mobile are supported by installing the mt8820b011 audio board. Umtsimt2000 based on wideband cdma erik dahlman, bjorn gudmundson, mats nilsson, and lohan skold ericsson radio systems ab abstract the umts terrestrial radio access is based on wideband 4. Transmission technology rtt concept identified as satellite wideband cdma swcdma, which was submitted 1 for evaluation to the international telecommunications union itu by the european space agency esa in the framework of the international mobile telecommunications2000 imt2000 satellitecomponent standardization.
The bandwidth of the data signal is now multiplied by a factor n ds. A major technology development, philips new fifthgeneration 0. Performance of wideband cdma using spacetime spreading over multipath nakagami fading channels. The application of successive interference cancellation and combining macrodiversity in software radio base stations nie, hong on. Box 300, fin00045 nokia group, finland 2 university of oulu, centre for wireless communications, p. Thus, they were typically designed to be wideband, and those that employed ds to achieve multiple access capabililty were the original forerunners of what is now called wideband cdma. In this paper, we present an overview of what has come to be known as wideband cdma wcdma. An fdd wideband cdma mac protocol for wireless multimedia. Effect of clipping in wideband cdma system and simple algorithm for. It supports conventional cellular voice, text and mms services, but can also carry data at high speeds, allowing mobile operators to deliver higher. Ofdm for wideband cellular systems yong peng, giridhar mandyam, senior member, ieee, and dinesh rajan, senior member, ieee abstractin this paper, we compare the downlink transport spectral ef. Wcdma wideband codedivision multiple access, an itu standard derived from codedivision multiple access cdma, is officially known as imt2000 direct spread.
This article provides a comprehensive introduction to wideband cdma. Figure 1 a binary information signal to modulate this signal, we would multiply this sequence with a. The mx882000c001 w cdma voice codec software option adds realtime voice encodingdecoding to the w cdma measurement software. Wcdma is a thirdgeneration mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in. It supports conventional cellular voice, text and mms services, but can also carry data at high speeds, allowing mobile operators to deliver higher bandwidth. Properties and elements of wideband cdma electrical and electrocnic enginnering, yonsei univ.
Software defined radio based wideband cdma systems. Code division multiple access cdma the concept of signal spreading and its uses in communications lets take a stright forward binary signal of symbol rate 2. Pdf widebandcdma approaches for the satellite umts component. Hence, cdma signals typically undergo frequency selective fading, and the channel appears as a tapped delay line to the signals. In the software radio base station receiver, an analogtodigital converter adc with very high resolution is required. Wideband dscdma for nextgeneration mobile communications. Wideband code division multiple access, along with umtsfdd, utrafdd, or imt2000 cdma direct spread is an air interface standard found in 3g mobile telecommunications networks. Compared to the narrowband cdma, wideband cdma can support services with much higher rate. Acomparisonbetweentimemultiplexing a pilot symbol stream. Introduction system model metric numerical results conclusion 2. Jun 21, 2004 a major technology development, philips new fifthgeneration 0. Overview in january 1998, european telecommunications standards institute etsi decided to choose the wcdma technology to be the multiple access techniques. W cdma is a thirdgeneration 3g mobile wireless technology that promises much higher data speeds to mobile and portable wireless.
First is the tradeoff between coding and spreading in a wideband channel. Wideband code division multiple access is a 3rd generation mobile communication system that uses code division multiple access cdma technology over a wide frequency band to provide highspeed multimedia and efficient voice services. Wideband cdma for third generation mobile communications. Hsdpa is emerging as one of the most widespread and successful commercial cellular 3. The basic principles of the physical layer of the frames future radio wideband multiple access system fma2 frames multiple access wideband cdma system are described in this paper. Cdma, code division multiple access an implementation of direct sequence spread spectrum, dsss, and was used almost universally for 3g mobile communications standards as it provided an excellent format as a multiple access scheme. The book compares a range of cdma design techniques and examines how each affects system performance.
Wideband code division multiple access wcdma is a thirdgeneration 3g standard that employs the directsequence code division multiple access dscdma channel access method and the frequencydivision duplexing fdd method to. Wcdma has been identified for 3g third generation mobile wireless technology. Interference subspace rejection in wideband cdmamodes for high datarate operation by henrik hansen, sofiene affes and paul mermelstein download pdf 272 kb. Based on wideband cdma erik dahlman, bjorn gudmundson, mats nilsson, and lohan skold ericsson radio systems ab abstract the umts terrestrial radio access is based on wideband 4. The use of direct sequence ds code division multiple access cdma is of interest to both the military and the commercial communities. In w cdma, the cell search itself is divided into five acquisition stages. The application of successive interference cancellation and.
Cdma is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. Interference cancellation and macrodiversity for wideband. While no precise definition of such a waveform exists, the concepts behind a wcdma design are simple to state. Pdf effect of clipping in wideband cdma system and simple. Milstein was an associate editor for communication theory for the ieee. A typical example is wideband codedivision multipleaccess cdma. The main goal of this project is to design a spacetime code system for wideband code division multiple access wideband cdma. Introduction this paper presents an overview of the wideband cdma concept. This allows several users to share a band of frequencies see bandwidth.
Abstract in this contribution the performance of wideband codedivision multipleaccess wcdma systems using spacetime spreading sts based transmit diversity is investigated, when frequencyselective nakagamim fading channels, multiuser interference and background noise are considered. In the software radio base station receiver, an analogtodigital converter adc with very high resolution is required to digitize the. The focus of this project emphasizes on hardware implementation of turbo codec that conforms to the 3g standard. Pdf on may 29, 2002, olli vaananen and others published effect of clipping. It has been chosen as the basic access technology for umtsimt2000 1. The coherent rake reception of wideband code division multiple access wideband cdma signals with complex spreading is considered in this chapter. Wideband code division multiple access wcdma is a thirdgeneration 3g standard that employs the directsequence code division multiple access ds cdma channel access method and the frequencydivision duplexing fdd method to provide highspeed and highcapacity service. Short for wideband cdma codedivision multiple access, a 3g technology that increases data transmission rates in gsm systems by using the cdma air interface instead of tdma.
Widebandcdma for the umtsimt2000 satellite component. Wideband code division multiple access wcdma definition. Wideband code division multiple access 45 displaying antijam and low probabilityofintercept characteristics was paramount. The 3g systems support wide band services like high speed internet access. Wideband code division multiple access wcdma is a cdma channel that is four times wider than the current channels that are typically used in 2g networks in north america. Japanese 3rd generation system employs wideband code division multiple access w. In view of these societal needs, the international. Wideband code division multiple access selected areas in. Gsm 1991, gprs 2000, edge 2003 gsm 2g, tdma cdmaone 1995 cdmaone 2g, cdma. Wcdma white papers wideband cdma, wideband code division. Cdma i about the tutorial code division multiple access cdma is a channel access method normally used by 3g radio communication technology as well as in some other technologies.
W cdma wideband codedivision multiple access, an itu standard derived from codedivision multiple access cdma, is officially known as imt2000 direct spread. Measurement of adjacent channel power on wideband cdma signals. An overview of cdma evolution toward wideband cdma ieee. Wideband cdma is a thirdgeneration 3g wireless standard which allows use of both voice and data and offers data speeds of up to 384 kbps. Wideband cdma is designed to flexibly offer wideband services, such as wireless internet services i. This paper presents algorithms and results for both initial and target cell search scenarios for the wideband cdma w cdma standard. Also see cdma, cdma one, and cdma2000 wcdma wideband codedivision multiple access, an itu standard derived from codedivision multiple access, is officially known as imt2000 direct spread. Wideband code division multiple access cdma has emerged as the mainstream air interface solution for the thirdgeneration networks.
Moreover, the mt8820b can measure the audio txrx without an external audio analyzer and. A dedicated pilot channel, which is separate from data channels, is used for the purpose of channel estimation. Built from layer 1 up, our umts solution includes support for 16qam hsdpa and cdma tdd umtstdd, rake detection for multipath fade mitigation, and advanced turbo decoding algorithms. This text evaluates wideband cdma as an effective third generation technology option, giving a picture of the various wideband cdma standardization activities underway worldwide in the late 1990s. In a cdma cellular system, the process of the mobile station searching for a cell and achieving code and time synchronization to its downlink scrambling code is referred to as cell search. Acomparisonbetweentimemultiplexing a pilot symbol stream and having a separate pilot. Codedivision multiple access cdma is a channel access method used by various radio communication technologies. The wcdma infrastructure is compatible with gsm mobile radio communication system. Abstract in this contribution the performance of wideband codedivision multipleaccess wcdma systems using spacetime spreading sts based transmit diversity is investigated.
Actual values depend on the type and number of code channels available within the cdma signal. Channel acquisition for wideband cdma signals selected. In europe, japan, korea, and the united states, wideband cdma systems are currently being standarized. In this chapter, we turn to a network of many mobile users interested in communicating with a common.
Evm analysis for distortions in an 8psk system, a gsm edge system, a wideband codedivision multipleaccess cdma system, and a general linear singlecarrier transmitreceive system have been. The technicality of cdma technology has given significant advantages over other parallel technologies in terms of spectrum efficiency and overall performance. This thesis focuses on the applications of successive interference cancellation sic and combining macrodiversity cm in software radio base station receivers to increase the reverse link capacity of wideband code division multiple access cmda systems. The ohio state university, 2002 philip schniter, adviser we consider a downlink ds cdma system in which multirate user signals are transmitted via synchronous orthogonal short codes overlaid with a common scrambling sequence. What is wideband code division multiple access wcdma. Find, read and cite all the research you need on researchgate. Utra will be connected to an evolved gsm core network for both circuit and packet services. In this work we tried to make the essential foundations for this goal. Nextgeneration mobile telecommunications system wideband cdma system evaluation 238. Third edition edited by harri holma and antti toskala both of nokia, finland. Wcdma is direct spread technology, which means that it will spread its transmissions over a wide, 5mhz carrier. Code division multiple access cdma signals, particularly wideband cdma signals, are likely to have bandwidths that are considerably larger than the inverse of the delay spread of the multipath propagation environment. Soft detection and decoding in wideband cdma systems kimmo kettunen dissertation for the degree of doctor of science in technology to be presented with due permission for public examination and debate in auditorium s1 at helsinki university of technology espoo, finland on the 14th of march, 2003 at 12 oclock noon. Wcdma is the leading 3g wireless standard in the world today.
Sep 12, 2008 the basic principles of the physical layer of the frames future radio wideband multiple access system fma2 frames multiple access wideband cdma system are described in this paper. Wcdmawideband code division multiple access definition. The aim of the thesis is to develop and validate novel receiver concepts suitable for future wideband cellular cdma systems. Wcdma or wcdma stands for wideband code division multiple access. Wcdma wideband code division multiple access an itu international telecommunications union standard derived from cdma code division multiple access technology. Wcdma wideband codedivision multiple access, an itu standard derived from codedivision multiple access, is officially known as imt2000 direct spread. Wcdma wideband code division multiple access wcdma wideband code division multiple access is the radio access scheme used for third generation cellular systems that are being rolled out in various parts of the globe. Live endtoend communication tests between a handset and w cdma mobile are supported by installing the mt8820b011 audio board. Following conclusions can be made regarding the different bandwidths and power levels within the signal path of the fse. Asynchronous wideband cdma for imt2000 harri holma1, antti toskala1 and matti latvaaho2 1 nokia telecommunications, new radio systems, p. What is wcdma wideband codedivision multiple access. Wideband cdma radio transmission technology the university. Transmission technology rtt concept identified as satellite wideband cdma sw cdma, which was submitted 1 for evaluation to the international telecommunications union itu by the european space agency esa in the framework of the international mobile telecommunications2000 imt2000 satellitecomponent standardization.
Basic note on spread spectrum cdma signals 3 figure 1. The fma2 is part of the frames dual mode platform designed as umts air interface, where the harmonisation with gsm is also taken into account. The reasons are the signal behavior itself and the requirements needed for adjacent and alternate channel leakage needed for interference free communication. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Abstract the ability to communicate with people on the move got unimaginable popularity in the past few years. Built from layer 1 up, our umts solution includes support for 16qam hsdpa and cdmatdd umtstdd, rake detection for multipath fade mitigation, and advanced turbo decoding algorithms. Adaptive chiprate equalization of downlink multirate. Wideband code division multiple access wcdma tutorial. The mx882000c001 wcdma voice codec software option adds realtime voice encodingdecoding to the wcdma measurement software. Advanced receiver structures capable of suppressing multipleaccess interference in codedivision multipleaccess cdma systems operating in frequencyselective fading channels are considered in this thesis. Wcdma or w cdma stands for wideband code division multiple access. Wideband code division multiple access wcdma is a thirdgeneration 3g standard that employs the directsequence code division multiple access dscdma channel access method and the frequencydivision duplexing fdd method to provide highspeed and highcapacity service. Wcdma is based on cdma and is the technology used in umts. Jeanpaul linnartz, 2007 cdma widebandcdma is665 bandwidth 1.