• Title/Summary/Keyword: successive cancellation

Search Result 155, Processing Time 0.028 seconds

An Ordered Successive Interference Cancellation Scheme in UWB MIMO Systems

  • An, Jin-Young;Kim, Sang-Choon
    • ETRI Journal
    • /
    • v.31 no.4
    • /
    • pp.472-474
    • /
    • 2009
  • In this letter, an ordered successive interference cancellation (OSIC) scheme is applied for multiple-input multiple-output (MIMO) detection in ultra-wideband (UWB) communication systems. The error rate expression of an OSIC receiver on a log-normal multipath fading channel is theoretically derived in a closed form solution. Its bit error rate performance is analytically compared with that of a zero forcing receiver in the UWB MIMO detection scheme followed by RAKE combining.

Recent Successive Cancellation Decoding Methods for Polar Codes

  • Choi, Soyeon;Lee, Youngjoo;Yoo, Hoyoung
    • Journal of Semiconductor Engineering
    • /
    • v.1 no.2
    • /
    • pp.74-80
    • /
    • 2020
  • Due to its superior error correcting performance with affordable hardware complexity, the Polar code becomes one of the most important error correction codes (ECCs) and now intensively examined to check its applicability in various fields. However, Successive Cancellation (SC) decoding that brings the advanced Successive Cancellation List (SCL) decoding suffers from the long latency due to the nature of serial processing limiting the practical implementation. To mitigate this problem, many decoding architectures, mainly divided into pruning and parallel decoding, are presented in previous manuscripts. In this paper, we compare the recent SC decoding architectures and analyze them using a tree structure.

A Successive Repeat-back Jamming Cancellation Scheme Using a Combined-PRN Signal to Mitigate Repeat-back Jamming for GNSS Receivers (GNSS 수신기의 C-PRN 신호 기반 재방송재밍 완화기법)

  • Yoo, Seungsoo;Yeom, Dong-Jin;Jee, Gyu-In;Kim, Sun Yong
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.20 no.10
    • /
    • pp.1073-1078
    • /
    • 2014
  • In this paper, an effective repeat-back jamming (RBJ) mitigation scheme known assuccessive repeat-back jamming cancellation (SRC) is proposed for the utilization of the successive interference cancellation (SIC) algorithm which is used to mitigate the near-far effect and the multiple-access interference for code division multiple-access communication systems. The proposed scheme uses a combined pseudo-random noise (C-PRN) signal from the estimated major parameters of RBJ signals. To evaluate the performance of the proposed scheme, the root mean squared (RMS) code tracking errors are shown according to the standard deviation of the parameter estimation errors of an RBJ signal, and using the well-known major parameters estimation schemes with a C-PRN signal through Monte-Carlo simulation.

Successive Interference Cancellation for the Uplink of MC-CDMA Systems with Multiple Receive Antennas

  • Kong, Hyung-Yun
    • Journal of electromagnetic engineering and science
    • /
    • v.9 no.2
    • /
    • pp.61-65
    • /
    • 2009
  • Successive interference cancellation(SIC) for the uplink of MC-CDMA mobile communications systems is an effective method to improve performance. We propose a successive interference cancellation(SIC) technique for the uplink of MC-CDMA mobile systems with multiple receive antennas. The destination uses optimum combining(OC) to combine the signals from an OFDM Demodulator with multiple receiving antennas, and applies SIC processing to the combined signals. Achieved interference cancellation order is depends on the signal to interference-plus-noise ratio (SINR) at the output of the optimum combiner. Monte-Carlo simulations are employed to verify the proposed technique.

Pipelined Successive Interference Cancellation Schemes with Soft/Hard Tentative Decision Functions for DS/CDMA Systems (DS/CDMA 시스템에서 연/경판정 함수를 적용한 파이프라인화된 직렬 간섭 제어 기법)

  • 홍대기;백이현;김성연;원세호;강창언
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.25 no.11A
    • /
    • pp.1652-1660
    • /
    • 2000
  • 본 논문에서는 DS/CDMA (Direct Sequence/Code Division Multipe Access) 시스템에서 임시 판정 함수로서 연판정 함수와 경판정 함수를 적용한 파이프라인화된 직렬 간섭 제어 구조(PSIC, Pipelined Successive Interference Cancellation)의 성능을 수식적으로 분석하고, 모의 실험을 통하여 검증한다. PSIC 구조는 다단 직렬 간섭 제거 구조(MSIC, Multistage Successive Interference Cancellation)가 가지는 복호지연(decoding delay)의 문제를 해결하기 위해 파이프라인 구조를 MSIC에 적용한 것이다. 제안된PSIC 구조는 하드웨어의 복잡도(hardwar complexity)를 희생하여 비트 오율(BER, Bit Error Rate)의 증가 없이 MSIC에서 발생하는 복호 지연을 줄일 수 있다. 또한 제안된 PSIC 구조에서 연판정 함수와 경판정 함수를 각 간섭 제거 단(Cancellation stage)에서의 임시 판정 함수로 사용하여 얻게 되는 PSIC 구조들의 성능을 비교한다. 분석 및 실험 결과에 의하면 제안되 PSIC 구조에서는 경판정 함수를 사용할때의 성능이 연판정 함수를 사용할때의 성능보다 우수함을 알 수 있었다.

  • PDF

Low Complexity Ordered Successive Cancellation Algorithm for Multi-user STBC Systems

  • Le, Van-Hien;Yang, Qing-Hai;Kwak, Kyung-Sup
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.32 no.2A
    • /
    • pp.162-168
    • /
    • 2007
  • This paper proposes two detection algorithms for Multi-user Space Time Block Code systems. The first one is linear detection Gaussian Elimination algorithm, and then it combined with Ordered Successive Cancellation to get better performance. The comparisons between receiver and other popular receivers, including linear receivers are provided. It will be shown that the performance of Gaussian Elimination receiver is similar but more simplicity than linear detection algorithms and performance of Gaussian Elimination Ordered Successive Cancellation superior as compared to other linear detection method.

Impulsive Noise Mitigation Scheme Based on Deep Learning (딥 러닝 기반의 임펄스 잡음 완화 기법)

  • Sun, Young Ghyu;Hwang, Yu Min;Sim, Issac;Kim, Jin Young
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.17 no.4
    • /
    • pp.138-149
    • /
    • 2018
  • In this paper, we propose a system model which effectively mitigates impulsive noise that degrades the performance of power line communication. Recently, deep learning have shown effective performance improvement in various fields. In order to mitigate effective impulsive noise, we applied a convolution neural network which is one of deep learning algorithm to conventional system. Also, we used a successive interference cancellation scheme to mitigate impulsive noise generated from multi-users. We simulate the proposed model which can be applied to the power line communication in the Section V. The performance of the proposed system model is verified through bit error probability versus SNR graph. In addition, we compare ZF and MMSE successive interference cancellation scheme, successive interference cancellation with optimal ordering, and successive interference cancellation without optimal ordering. Then we confirm which schemes have better performance.

Performance Analysis of a DS-CDMA System with Partial SSPIC Multiuser Detection Schemes in Rayleigh Fading Channel (레일리 페이딩 채널에서 부분 SSPIC 다중사용자 검파기법을 적용한 DS-CDMA 시스템의 성능분석)

  • 이현재;오창헌;신동욱
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.13 no.3
    • /
    • pp.269-278
    • /
    • 2002
  • In this paper, we proposed and analyzed the performance of the partial SSPIC (Successive Serial Parallel Interference Cancellation ) scheme adopting modified successive serial interference cancellation (SIC) scheme. Modified partial successive serial cancellation (SIC) stage is used to effectively shorten interference cancellation delay. Performance is analyzed in Rayleigh fading channel with both perfect and imperfect channel estimation. From the results, proposed partial SSPIC I and II multiuser detectors can shorten effectively a detection delay at first SIC stage. The partial SSPIC type l detector outperformed the conventional concatenated SICPIC detector in both performance and capacity and type ll detector maintains similar performance. Proposed partial SSPIC multiuser detector can effectively improve the system performance without excessive detection delay.

Performance analysis of multistage interference cancellation schemes for a DS/CDMA system subject to delay constraint (CD/CDMA 시스템에서의 제한된 처리 지연 시간을 고려한 단단계 간섭 제거 방식에 대한 성능 분석)

  • 황선한;강충구
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.22 no.12
    • /
    • pp.2653-2663
    • /
    • 1997
  • The successive and parallel interference cancellation schemes are two well-known types of multi-stage interference cancellation schemes using the conventional correlator receivers as a basic building block, which has been known to significantly improve the performance of DS/CDMA system in the multiple access communication. Performance comparison between these two schemes is made strictly based on the analytical and it has been shown that the successive interference cancellation (SIC) scheme is more resistant to fading than the parallel interference cancellation (PIC) scheme. We further investigate the performance of the successive IC scheme subject to the delay constraint, which may be imposed typically on most of service applications with a real-time transmission requirement, including speech and video applications. Our analysis demonstrates that the performance may be significantly improved by the groupwise successive interference cancellation (GSIC) scheme, which can be properly optimized to meet the given delay constraint.

  • PDF

Performance Enhancement Technique in Visible Light Communication System for Smart Building (스마트 빌딩을 위한 가시광 통신 시스템의 성능 향상 기법)

  • Seo, Sung-Il
    • The Journal of the Institute of Internet, Broadcasting and Communication
    • /
    • v.20 no.5
    • /
    • pp.39-43
    • /
    • 2020
  • In this paper, we propose the multi-channel interference cancellation algorithm for visible light communication (VLC) in smart building. The VLC system is communication technology using visible rays that come out in Light Emitting Diode (LED) device. It has energy curtailment effect and possible to use in ubiquitous network service applications. When a large number of users communicate indoors, the performance can be reduced due to channel interference. To remove interference, at the first, the minimum mean square error (MMSE) scheme as interference cancellation methods used, and then the successive interference cancellation (SIC) is applied to obtain additional diversity gain and improve interference cancellation performance. Indoor VLC channel model is employed. The performance is evaluated in terms of bit error rate (BER). From the simulation results, it is confirmed that the proposed scheme has better BER performance compared to the previous systems. As a result, the proposed interference cancellation improves the signal quality of VLC systems by effectively removing the channel noise. The results of the paper can be applied to VLC for smart building and general communication systems.