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Thursday, November 12, 2020 | History

3 edition of Improved CDMA performance using parallel interference cancellation found in the catalog.

Improved CDMA performance using parallel interference cancellation

Dariush Divsalar

Improved CDMA performance using parallel interference cancellation

  • 324 Want to read
  • 11 Currently reading

Published by Jet Propulsion Laboratory, California Institute of Technology, National Aeronautics and Space Administration, National Technical Information Service, distributor in [Pasadena, Calif.], [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Parallel processing (Computers),
  • Code division multiple access.

  • Edition Notes

    StatementDariush Divsalar, Marvin Simon.
    Series[NASA contractor report] -- NASA-CR-203572., NASA contractor report -- NASA CR-203572.
    ContributionsSimon, Marvin., Jet Propulsion Laboratory (U.S.), United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15540224M

    The low complexity receiver structure based on discrete cosine transform for a downlink multicarrier code division multiple access (DCT-MC-CDMA) system is proposed. It employs an interference cancellation scheme with a linear equaliser to suppress the multiple access interference and interference caused by the multipath fading channel The performance of the proposed receivers is Cited by: 3. Interference cancellation in multi stage multi-user detection in significantly improve the performance and capacity of a DS-CDMA system. The multi user detectors classified as optimal and suboptimal detectors. parallel interference cancellation is based onFile Size: KB. In this paper, we introduce a novel approach to interference cancellation for code division multiple access (CDMA) uplink transmission. Several models combining principles of serial (SIC) and parallel (PIC) interference cancellation are discussed. The proposed scheme is derived from the analysis of these hybrid models and applies a user configuration algorithm (termed "trickle") in order to.


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Improved CDMA performance using parallel interference cancellation by Dariush Divsalar Download PDF EPUB FB2

DIVSALAR et al.: IMPROVED PARALLEL INTERFERENCE CANCELLATION FOR CDMA so-called decorrelating receiver [4]. In this method, the dif-ferent users are made uncorrelated by a linear transformation.

This linear transformation is computed by measuring all cross correlations between pairs of user codes and then inverting the. Improved CDMA performance using parallel interference cancellation Author: Dariush Divsalar ; Marvin Simon ; Jet Propulsion Laboratory (U.S.) ; United States.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract—This paper introduces an improved nonlinear parallel interference cancellation scheme for code-division multiple access (CDMA) that significantly reduces the degrading effect on the desired user of interference from the other users that share the channel.

This paper introduces an improved nonlinear parallel interference cancellation scheme for code-division multiple access (CDMA) that significantly reduces t.

Parallel multistage interference cancellation is a promising approach for practical implementation of multiuser detection. However, as this paper shows, direct implementation of multistage parallel interference cancellation (i.e. complete.

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.

This paper introduces an improved nonlinear parallel interference cancellation scheme that significantly reduces the degrading effect of user interference with implementation complexity linear in.

Parallel interference cancellation (PIC) is a promising detection technique for code division multiple access (CDMA) systems. Parallel interference cancellation (PIC) based channel parameter estimators for frequency selective fading channels are proposed for the uplink in code-division multiple-access (CDMA) mobile.

parallel interference cancellation (PIC) DS-CDMA multiuser receivers, which cancel only a fraction of the estimated multiple access interference (MAl) at each receiver stage. This technique takes into account the fact that the MAl Improved CDMA performance using parallel interference cancellation book, especially in the earlier stages, contains substantial error, and a relatively conservative strategy of Cited by: Uplink MC-CDMA is asynchronous, and each user’s signal experiences independent fading, therefore the low complexity, linear narrowband receivers used for downlink are not applicable.

However, in this case, wideband interference cancellation schemes can provide good multi-user detection. If the asynchron ism is constrained to a fraction of the symbol length, a narrowband interference cancellation scheme Author: Andrew C.

McCormick, Peter M. Grant, Gordon J. Povey. Improved CDMA Performance Using Parallel Interference Cancellation. 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 Author: Marvin Simon and Dariush Divsalar. Successive Interference Cancellation and Parallel Interference Cancellation Dec. 9, IEEE pp [3] J. Andrews, "Successive Interference Cancellation for Uplink CDMA," Ph.D.

Dissertation Stanford University, [4] PULINPATEL and JACKHOLTZMAN “Performance comparison of a DS/CDMA System using a Successive Interference.

In the second part of this thesis, two simple multiuser detection techniques are chosen for implementation in the DS-CDMA system performance testbed: successive interference cancellation (SIC) and.

Performance of DS-CDMA systems with optimal hard-decision parallel interference cancellation Abstract: We study a multiuser detection system for code-division multiple access (CDMA). We show that applying multistage hard-decision parallel interference cancellation (HD-PIC) significantly improves performance compared to the matched filter by: This paper introduces an improved nonlinear parallel interference cancellation scheme for code-division multiple access (CDMA) that significantly reduces the degrading effect on the desired user of.

In this paper, we investigate the feasibility of a 2-Dimensional Optical Code Division Multiple Access (2D-OCDMA) system, with electronic coding and decoding functions.

We develop a modified construction method of Multi-Wavelength Optical Orthogonal. Performance evaluation of Passive Optical CDMA Networks using a linear parallel interference receiver in imperfect power cases ☆ Author links open overlay panel A.

Okassa m’foubat F. Cited by: 3. Abstract: The optimum performance of the improved parallel interference cancellation (PIC) receiver is shown for a DS-CDMA system over Rayleigh fading channels.

The improved PIC receiver proposed by Divsalar et al. (see IEEE Trans. Commun., vol, no.2, p, ) significantly reduces the degrading effect on the desired user of interference by removing from each user a part of the.

work has been done in the simulation and analysis of Parallel Interference Cancellation (PIC) techniques in reducing MAI for CP-CDMA system, however, concentrated on the improvement in bit-error-rate (BER) performance of the system after PIC [6].

In this paper, we propose performance of parallel interference cancellation (PIC) receiver in CP-CDMA. We present a new turbo multiuser detector for turbo-coded direct sequence code division multiple access (DS-CDMA) systems.

The proposed detector is based on the utilization of a parallel interference cancellation (PIC) and a bank of turbo decoders. The PIC is broken up in order to perform interference cancellation after each constituent decoder of the turbo decoding by: 5. In addition to mitigating the near/far effect, MUD has the more fundamental potential of raising capacity by canceling MAI.

This paper analyses the convergence behavior and performance of successive interference cancellation (SIC) for CDMA systems this analysis will be generalized in this paper for parallel interference cancellation (PIC) : G. Deepthy, R.

Susan. This paper considers the performance of Successive Interference Cancellation (SIC) applied to a DS/CDMA micro-cellular environment, by employing a circular geometry and expressing the BER of a Author: Ki S. Kim, Sug B. Kang, Soo K. Kwon.

Parallel interference cancellation (PIC) based channel parameter estimators for frequency selective fading channels are proposed for the uplink in code-division multiple-access (CDMA) mobile communication systems.

The performance of PIC based algorithms depends heavily on the quality of the multiple-access interference estimates, which can be improved by using adaptive Cited by: CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): In this paper, we describe and evaluate multistage partial parallel interference cancellation (PPIC) multiuser detectors to improve the performance of multi-carrier direct-sequence code-division multiple-access (MC-CDMA) power line communication (PLC) systems over frequency selective fading channels with nonperfect.

Therefore, we study in the next part the use of a specific receiver named Parallel Interference Cancellation (PIC), which removes partially MAI.

Parallel interference cancellation (PIC) receiver. To improve the performances and so to reduce the constraints on the temporal code length (F) and the number of wavelength (L), we use a PIC Cited by: De Gaudenzi R., Giannetti F., Luise M.

() How Can Interference-Rejection Receivers Increase the Capacity of CDMA Multi-Beam Satellite Communication Systems?. In: Vatalaro F., Ananasso F. (eds) Mobile and Personal Satellite Communications by: 1. This paper introduces an improved parallel interference cancellation algorithm in a DS/CDMA communication system.

Because of the lack of the energy information of interfering signal in the conventional parallel interference cancellation (PIC) algorithm, the detection performance of the weak signals is not improved. The algorithm introduced in this paper takes advantage of the virtue of.

Improved Iterative Parallel Interference Cancellation Receiver for Future Wireless DS-CDMA Systems. We present a new turbo multiuser detector for turbo-coded direct sequence code division multiple access (DS-CDMA) systems. The proposed detector is based on the utilization of a parallel interference cancellat.

Analysis of Successive Interference Cancellation in CDMA Systems Abstract: In DS/CDMA systems, overcoming near/far effects and fading is imperative for satisfactory performance. One way to combat the near/far effect is to use stringent power control, as is done in most of the commercial systems.

Adaptive Implementation of DS-CDMA with Interference Cancellation. been adapted to improve the reliability. The parallel processing can be done in multiple stages.

Synthesis has been decoding can approach both the performance of optimal detection of CDMA, [17], and also the capacity of the CDMA Author: K R Madhumitha, hree.

However, for a small spreading factor (SF), the residual inter-chip-interference (ICI) degrades the BER performance. We propose three types of ICI cancellation and the BER performance improvement is evaluated by computer simulation.

The ICI replica is generated and subtracted from the FDE-equalized chip sequence. Shan, P & Rappaport, TSParallel interference cancellation (PIC) improvements for CDMA multiuser receivers using partial cancellation of MAI estimates. in Conference Record / IEEE Global Telecommunications Conference.

vol. 6, pp.Proceedings of the IEEE GLOBECOM - The Bridge to the Global Integration, Sydney, NSW, Aust, 11/8/Cited by: Improved CDMA Performance Using Parallel Interference Cancellation Dariush Divsalar Marvin Simon Abstract 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.

Simulation performance comparison of various linear multiuser and parallel interference cancellation (PIC) detectors in the presence of imperfect power control and channel estimation is presented. Author: XueGuoqiang, WengJianfeng, Le-NgocTho.

Linear parallel interference cancellers (LPIC) have the advantages of implementation simplic-ity, analytical tractability, and good performance [1]-[12]. The conventional way to realize LPIC schemes is to use unscaled values of the previous stage soft outputs of different users for multiple access interference (MAI) estimation.

Interference cancellation (IC) is one identified key technology to enhance WCDMA uplink performance. The goal of this contribution is to highlight the relative uplink system capacity improvement available for WCDMA, especially in realistic typical urban radio environments when employing receiver implementations including realistic channel estimation, searcher, and so : HagermanBo, GunnarssonFredrik, MuraiHideshi, TadenumaMioko, KarlssonJonas.

Also, Type-II receiver performs better than Type-I receiver because of enhanced accuracy of the interference estimates achieved due to frequency diversity offered by MCC. Index Terms—Linear parallel interference cancellation, linear matrix filters, decorrelating detector, MMSE detector, multicarrier DS-CDMA.

Abstract: In this paper, we describe and evaluate multistage partial parallel interference cancellation (PPIC) multiuser detectors to improve the performance of multi-carrier direct-sequence code-division multiple-access (MC-CDMA) power line communication (PLC) systems over frequency selective fading channels with non-perfect power control.

Performance Analysis, improvement and complexity reduction in Multi stage Multi-User Detector with parallel interference cancellation for DS-CDMA System Using odd kasami sequence *RABABU, **A RAO E.C.E Department * P.V.P.

Siddhartha Institute of Technology, ** Andhra Loyola Institute of Engineering &Technology. This paper presents an efficient algorithm to cancel the parallel interference for multiuser detection (MUD) schemes in code division multiple access (CDMA) based Gb/s optical multiple input multiple output orthogonal frequency division multiplexing (O-MIMO-OFDM) system over km of standard single mode fiber (SSMF).Cited by: 4.Parallel interference cancellation (PIC) is an effective method to suppress the MAI and improve the CDMA system capacity.

In this paper, we propose three interference cancellation architectures for downlink cyclic prefix CDMA systems. The common thread between these three architectures is their implementation in frequency by: Divsalar and M.K.

Simon, Improved CDMA performance using parallel interference cancellation, in: Proc. of IEEE Military Communications Conference, Ft. Monmouth, NJ (October ) pp. .