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Interference Cancellation For Short Code Ds Cdma In The Presence Of Channel Fading
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Book Synopsis Interference Cancellation for Short-code DS-CDMA in the Presence of Channel Fading by : Amit K. Dutta
Download or read book Interference Cancellation for Short-code DS-CDMA in the Presence of Channel Fading written by Amit K. Dutta and published by . This book was released on 1997 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interference from other adjacent users in wireless applications is a major problem in direct-sequence code-division multiple-access (DS-CDMA). This is also known as the near-far problem where a strong signal from one user interferes with other users. The current approach to deal with the near-far problem in DS-CDMA systems is to use strict transmitter power control. An alternative approach is to use near-far resistant receivers. The practical near-far resistance receiver structure is the adaptive decorrelating detectors since it avoids complex matrix inversion. The existing CDMA standard known as IS-95 uses a long signature code sequence. However for simplicity, the adaptive multi-user receiver uses short signature code sequence. The problem is that adaptive receivers lose near-far resistance as the number of users increases in the system. This thesis describes a novel method of multistage decision feedback cancellation (DFC) scheme immune from the near-far problem. The performance of the new DFC structure is constructed using three different adaptive algorithms: the least mean squared (LMS), the recursive least squared (RLS) and the linearly constraint constant modulus (LCCM) adaptive algorithms. It is found that LMS adaptive algorithm provides the best result considering its simple hardware complexity. It is also found that the LMS adaptive receiver along with the DFC structure provides a better bit synchronization capability to the over all system. Since the receiver is near-far resistant, the LMS adaptive receiver along with the decision feedback cancellation structure also performs better in the presence of Rayleigh fading.
Book Synopsis Co-channel Interference Cancellation for DS/CDMA Over Multipath Rayleigh Fading Channels by : Andrew Lai Chun Hui
Download or read book Co-channel Interference Cancellation for DS/CDMA Over Multipath Rayleigh Fading Channels written by Andrew Lai Chun Hui and published by . This book was released on 1996 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coding and Interference Suppression for CDMA Systems on Fading Channels by : Kai Tang
Download or read book Coding and Interference Suppression for CDMA Systems on Fading Channels written by Kai Tang and published by . This book was released on 2001 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Successive Interference Cancellation in Multicarrier DS/CDMA by : Lin Fang
Download or read book Successive Interference Cancellation in Multicarrier DS/CDMA written by Lin Fang and published by . This book was released on 2000 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis CDMA Performance Using Parallel Interference Cancellation Over the Rayleigh Fading Channel by :
Download or read book CDMA Performance Using Parallel Interference Cancellation Over the Rayleigh Fading Channel written by and published by . This book was released on 2003 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Successive Interference Cancellation for the Forward Channel of IS-95 Code Division Multiple Access Communications by : Michael Golanbari
Download or read book Successive Interference Cancellation for the Forward Channel of IS-95 Code Division Multiple Access Communications written by Michael Golanbari and published by . This book was released on 1999 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Blind Signal Detection for DS-CDMA Over Frequency-selective Fading Channels by : Weiguo Liang
Download or read book Blind Signal Detection for DS-CDMA Over Frequency-selective Fading Channels written by Weiguo Liang and published by . This book was released on 2004 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Suppression Techniques for Multicarrier DS-CDMA. by : Weiping Xu
Download or read book Interference Suppression Techniques for Multicarrier DS-CDMA. written by Weiping Xu and published by . This book was released on 1998 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of Fading Channel in DS-Cdma Multiuser Communications Systems by : Chun-Yu Fung
Download or read book Estimation of Fading Channel in DS-Cdma Multiuser Communications Systems written by Chun-Yu Fung and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Estimation of Fading Channel in DS-CDMA Multiuser Communications Systems" by Chun-yu, Fung, 馮震宇, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the Thesis Entitled Estimation of Fading Channel in DS-CDMA Multiuser Communications Systems submitted by Fung Chun Yu for the degree of Master of Philosophy at the University of Hong Kong in December 2002 Multipath fading and multiuser access interference are two major impairments in direct-sequence code-division multiple-access (DS-CDMA) systems. Efficient channel estimation and multiuser detection techniques play important roles in overcoming these deficiencies. This thesis is concerned with the design of a space-time (ST) blind adaptive receiver for DS-CDMA systems and the accompanied channel estimation algorithm. A new space-time decorrelating RAKE (ST-DRAKE) receiver is developed for blind reception of CDMA signals in frequency-selective fading channels. It has the advantage that only the knowledge of the desired user's signature waveform is required and therefore no transmission of training sequence is needed. The ST-DRAKE receiver consists of two parts. The first part is a set of constrained adaptive filters that are designed to suppress interference based on the minimum output energy criterion. These filters are implemented in a structure analogous to the general sidelobe canceller in array processing, which is implemented by a multistage Weiner filter is employed to reduce the complexity of the receiver. The second part of the ST-DRAKE receiver coherently combines the outputs of the constrained adaptive filters and gives an estimate of the transmitted signal. Simulation results show that the ST- DRAKE delivers significant performance improvement by exploiting the spatial diversity of the antenna array. The problem of estimating fast fading channels in the proposed receiver is also addressed. The time-varying channel is modeled as an autoregressive process and the Kalman filter is employed to estimate the time-varying channel coefficients. A robust Kalman filter based on the M-estimate cost function is also developed to suppress impulsive noise present in the received signals. Simulation results show that the Kalman filter provides more accurate channel estimate to the ST-DRAKE than using the decomposition method. Simulation results also show that the coupled receiver has a performance comparable to the optimum minimum mean-squared error receiver with known channel information. DOI: 10.5353/th_b2750902 Subjects: Code division multiple access Wireless communication systems
Download or read book Adaptive WCDMA written by Savo G. Glisic and published by John Wiley & Sons. This book was released on 2003-07-25 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: CDMA (Code Division Multiple Access) is one type of multiple access system used in radio communication. Other multiple access methods include TDMA, FDMA, etc. WCDMA (Wideband Code Division Multiple Access) is the main air interface used for third generation mobile communication systems - UMTS (Universal Mobile Telecommunication System) and is characterised by a wider band than CDMA. WCDMA uses a wider radio band than CDMA, which was used for 2G systems, and has a high transfer rate and increased system capacity and communication quality by statistical multiplexing, etc. WCDMA efficiently utilises the radio spectrum to provide a maximum data rate of 2 Mbit/s. Third generation mobile communication systems are scheduled for operational startup in Japan and Europe in 2001-2002. Applying high-speed data transfer and state-of-the-art radio terminal technology, third generations systems enable multimedia and are currently in the process of being standardised under 3GPP. Among the three types of system to be standardised (i.e. WCDMA, MC-CDMA, UTRA TDD), Japan and Europe will adopt WCDMA in a strategy to take the lead through superior service. This volume will cover the latest theoretical principles of WCDMA and explain why these principles are used in the standards. Starting with a general overview, the more advanced material is then gradually introduced providing an excellent roadmap for the reader. * Presents comprehensive coverage of the theoretical and practical aspects of WCDMA * Provides a detailed roadmap by presenting the material step-by-step for readers from differing backgrounds * Systematically presents the latest results in the field Ideal for Engineers, academics and postgraduate students involved in research and development, engineers involved in management and administration.
Book Synopsis Parallel Interference Cancellation for Asynchronous DS-CDMA in Frequency-selective Rayleigh Channels by : Xiaoming Xue
Download or read book Parallel Interference Cancellation for Asynchronous DS-CDMA in Frequency-selective Rayleigh Channels written by Xiaoming Xue and published by . This book was released on 2000 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1997 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Estimation and Equalization of Fading Channels and Code-timing Acquisition of DS-CDMA Signals by : Yongbin Wei
Download or read book Adaptive Estimation and Equalization of Fading Channels and Code-timing Acquisition of DS-CDMA Signals written by Yongbin Wei and published by . This book was released on 1999 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Suppression in DS/CDMA Systems Over Frequency-selective Fading Channels by : Stefano Buzzi (ingegnere.)
Download or read book Interference Suppression in DS/CDMA Systems Over Frequency-selective Fading Channels written by Stefano Buzzi (ingegnere.) and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference Cancellation in Direct Sequence Code-division Multiple-access (CDMA) by : Vishal Bhingarkar
Download or read book Interference Cancellation in Direct Sequence Code-division Multiple-access (CDMA) written by Vishal Bhingarkar and published by . This book was released on 2002 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Co-channel Interference Cancellation for DS-SS CDMA Mobile Communication System by : Kamel Mostafa Shaheen
Download or read book Co-channel Interference Cancellation for DS-SS CDMA Mobile Communication System written by Kamel Mostafa Shaheen and published by . This book was released on 1997 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis DS-CDMA Multi-user Detection in Asynchronous Multi-path Fading Channels Using Iterative Cancellations by : Xiaoli Liu
Download or read book DS-CDMA Multi-user Detection in Asynchronous Multi-path Fading Channels Using Iterative Cancellations written by Xiaoli Liu and published by . This book was released on 2004 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
