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Book Trickle based Interference Cancellation Schemes for CDMA Systems

Download or read book Trickle based Interference Cancellation Schemes for CDMA Systems written by Pooyan Haghighat and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Design of Interference cancellation Receiver for CDMA with MIMO system

Download or read book Design of Interference cancellation Receiver for CDMA with MIMO system written by Dr.P.Sreesudha, and published by Archers & Elevators Publishing House. This book was released on with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Parallel Interference Cancellation Multiuser Detection

Download or read book Parallel Interference Cancellation Multiuser Detection written by Donald Richard Brown and published by . This book was released on 2000 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Successive Interference Cancellation in Multicarrier DS CDMA

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 Improved Subtractive Interference Cancellation for DS CDMA

Download or read book Improved Subtractive Interference Cancellation for DS CDMA written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Third generation wireless systems are being brought into operation rapidly. Multiuser detection is a key technology that can substantially increase the system capacity. Subtractive interference cancellation is a major category of multiuser detection. Due to their lower complexity, subtractive interference cancellation approaches are attractive for the practical implementation of multiuser detection. This thesis begins with a brief study of several multiuser detection techniques followed by an investigation of subtractive interference cancellation techniques. Two basic schemes, successive interference cancellation (SIC) and parallel interference cancellation (PIC) are discussed in detail and other schemes based on these two, a hybrid and a groupwise scheme, are also introduced. Both SIC and PIC have disadvantages. Consequently, a multistage groupwise weighted interference cancellation (MGWIC) scheme that is flexible in practical implementation and has good performance is proposed and analyzed. The analysis and simulation for a simplified case are presented. The implementation and performance under other conditions are also discussed.

Book Analysis of Succesive Interference Cancellation Scheme in Multiple Data Rate DS CDMA Systems

Download or read book Analysis of Succesive Interference Cancellation Scheme in Multiple Data Rate DS CDMA Systems written by Ann-Louise Johansson and published by . This book was released on 1995 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Iterative Successive Interference Cancellation Scheme to Remove Multi User Interference Due to Carrier Frequency Offsets in OFDMA Uplink

Download or read book Iterative Successive Interference Cancellation Scheme to Remove Multi User Interference Due to Carrier Frequency Offsets in OFDMA Uplink written by Vishak Ravindranath Neergund and published by . This book was released on 2011 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal Frequency Division Multiple Access (OFDMA) is similar to OFDM but has its subcarriers allocated to different users using different Carrier Allocation Schemes. In OFDMA, the fact that each user has a different Carrier Frequency Offset (CFO) makes the Interference Cancellation more challenging than OFDM systems. CFO can destroy orthogonality among subcarriers. This results in Inter-Carrier Interference (ICI), i.e., Interference among subcarriers of the same user, and Multi-User Interference (MUI), i.e., Interference due to other users. It induces significant performance degradation. Eliminating MUI is more challenging at the base station of an OFDMA system because of multiple CFOs. In this paper, we present an improvement to a Successive Interference Cancellation (SIC) scheme to compensate CFO by removing MUI on users. In the SIC scheme, a decorrelator is used to remove the ICI within a user's signal and successive cancellation is applied to mitigate the MUI arising due to the frequency difference among uplink users. We extend this scheme by following the SIC scheme first and then doing a re-iteration successively in the reverse order to eliminate MUI of each user on every other user. The proposed improvement is investigated for performance.

Book Successive Interference Cancellation for the Forward Channel of IS 95 Code Division Multiple Access Communications

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 Improved Cdma Performance Using Parallel Interference Cancellation

Download or read book Improved Cdma Performance Using Parallel Interference Cancellation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report considers a general parallel interference cancellation scheme that significantly reduces the degradation effect of user interference but with a lesser implementation complexity than the maximum-likelihood technique. The scheme operates on the fact that parallel processing simultaneously removes from each user the interference produced by the remaining users accessing the channel in an amount proportional to their reliability. The parallel processing can be done in multiple stages. The proposed scheme uses tentative decision devices with different optimum thresholds at the multiple stages to produce the most reliably received data for generation and cancellation of user interference. The 1-stage interference cancellation is analyzed for three types of tentative decision devices, namely, hard, null zone, and soft decision, and two types of user power distribution, namely, equal and unequal powers. Simulation results are given for a multitude of different situations, in particular, those cases for which the analysis is too complex. Simon, Marvin and Divsalar, Dariush Jet Propulsion Laboratory...

Book Successive Interference Cancellation in DS CDMA Systems

Download or read book Successive Interference Cancellation in DS CDMA Systems written by Ann-Louise Johansson and published by . This book was released on 1998 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Power Allocation and Capacity Analysis in CDMA Systems with Successive Interference Cancellation

Download or read book Power Allocation and Capacity Analysis in CDMA Systems with Successive Interference Cancellation written by Aravind R. Warrier and published by . This book was released on 2006 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Interference Cancellation for Short code DS CDMA in the Presence of Channel Fading

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.