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3 edition of Multi-stage decoding for multi-level block modulation codes found in the catalog.

Multi-stage decoding for multi-level block modulation codes

Multi-stage decoding for multi-level block modulation codes

technical report to NASA Goddard Space Flight Center

  • 197 Want to read
  • 9 Currently reading

Published by Dept. of Electrical Engineering, University of Hawaii at Manoa in Honolulu, Hawaii .
Written in English

    Subjects:
  • Data compression (Telecommunication),
  • Optical data processing.

  • Edition Notes

    Other titlesMulti stage decoding for multi level block modulation codes.
    StatementShu Lin, principal investigator.
    SeriesNASA contractor report -- NASA CR-188759.
    ContributionsGoddard Space Flight Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL18063150M

    This paper investigates various types of multi-stage decoding for multi-level modulation codes. It is shown that if the componenet codes of a multi-level modulation code and types of decoding at various stages are chosen properly, high spectral efficiency and large coding gain can be achieved with reduced decoding complexity.   To approach the channel capacity, we propose a zigzag-coded modulation scheme based on multi-level coding and multi-stage decoding. Specifically, we divide the B mapping bits into L levels X 1,X 2,,X L where X i = (b i, 1, b i, 2, , b i, α i) for 1 ≤ i ≤ L and ∑ i = 1 L α i = B. According to the chain rule of mutual information.

    Furthermore, the multilevel modulation codes constructed by this method allow the use of multistage decoding procedures that provide good trade-offs between performance and decoding complexity. The second method is to construct TCM codes using convolutional codes with good free branch distance in conjunction with the multilevel coding technique. IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 45, NO. 5, JULY Multilevel Codes: Theoretical Concepts and Practical Design Rules Udo Wachsmann, Member, IEEE, Robert F. H. Fischer, Member, IEEE, and Johannes B. Huber, Member, IEEE Abstract— This paper deals with 2 `-ary transmission using multilevel coding (MLC) and multistage decoding .

    These codes can be designed to have large diversity which makes them attractive for use in fading channels. We also present an iterative decoding algorithm taylored to fit the properties of the proposed codes. The itera-tive decoding algorithm we present has a complexity comparable to the complexity of GMD decoding of the same codes. Multi-stage decoding of LDPC codes Abstract: In this paper we present a three-stage decoding strategy that combines quantized and un-quantized belief propagation (BP) decoders with a mixed-integer linear programming (MILP) decoder. Each decoding stage is activated only when the preceding stage fails to converge to a valid codeword.


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Multi-stage decoding for multi-level block modulation codes Download PDF EPUB FB2

Multi-stage decoding for multi-level modulation codes really offers a way to achieve the best of three worlds, bandwidth efficiency, coding gain and decoding complexity. In this paper, we investigate and analyze various types of multi-stage decoding for multi-level block modulation codes, particularly the multi-stage soft-decision maximum likeli.

code like block codes, convolutional codes, turbo codes, etc. can be used as a component code. Multi-Level Coded Modulation Multi-Level Encoding scheme The multilevel encoder is shown in figure 1. Each bit/trit is independently protected.

Mapping is then used to select a point from the : Alaa Ghaith, Ali Alaeddine. Multi-stage decoding for multi-level block modulation codes. By Shu Lin. Abstract. In this paper, we investigate various types of multi-stage decoding for multi-level block modulation codes, in which the decoding of a component code at each stage can be either soft-decision or hard-decision, maximum likelihood or bounded-distance.

Author: Shu Lin. It was found that the difference in performance between the suboptimum multi-stage soft decision maximum likelihood decoding of a modulation code and the single stage optimum decoding of the overall code is very small, only a fraction of dB loss in SNR at the probability of an incorrect decoding for a block of 10(exp -6).Author: Shu Lin and Tadao Kasami.

a multi-level modulation code with the multi-stage decod-ing, i.e., component codes are decoded sequentially stage by stage, decoding information is passed from one stage to the next. This type of decoding reduces the decoding complex-ity.

Multi-stage decoding is not optimum even though the decoding of each component is optimum. In this case, it is. When we compare the one-level and the two-level coded, we can remark that the two-level coded modulation improves the performance whatever the decoding technique used, this improvement is bigger when we used the Multi-Stage Decoding, and the gain at BER= is approximately dB for the Parallel Independent Decoding and it is up to dB.

It was found that the difference in performance between the suboptimum multi-stage soft decision maximum likelihood decoding of a modulation code and the single stage optimum decoding of the overall code is very small, only a fraction of dB loss in SNR at the probability of an incorrect decoding for a block of 10(exp -6).

Multi-stage decoding. The decoding problem of multi-level block modulation codes is investigated. The hardware design of soft-decision Viterbi decoder for some short length 8-PSK block modulation codes is presented. An effective way to reduce the hardware complexity of the decoder by reducing the branch metric and path metric, using a non-uniform floating-point to.

and decoding delay. Multi:level coding is a powerful technique for constructing bandwidth efficient coded modulation codes. Good multi-level coding schemes can be designed by using previously known codes as component codes. • Multi-stage decoding provides a simple decoder implementation for multi-level codes with a small loss in coding gain.

For the multi-level codes, if the multi-stage decoding. [10] J. Wolf, "Efficient maximum likelihood decoding of linear block codes L. Zhang and B. Vucetic, "Multilevel modulation codes. It is known that multi-level coding (MLC) with multi-stage decoding (MSD) approaches the point-to-point constellation constrained channel capacity subject to appropriate choice of code.

Kasami, T. Takata and T. Fujiwara and S. Lin, “Multi-Stage Decoding for Multilevel Block Modulation Codes,” NASA Technical Report No. (Aug ) and submitted to IEEE Trans. on Information Theory, (in revision). Furthermore, the multi-level structure allows decoding of a multi-level modulation code with the multi-stage decoding.

This type of decoding reduces the decoding complexity. Get this from a library. Multi-stage decoding for multi-level block modulation codes: technical report to NASA Goddard Space Flight Center.

[Shu Lin; Goddard Space Flight Center.]. Analog decoding of trellis coded modulation for multi-level flash memories Maximum Likelihood Decoding for Multi-Level Cell Memories with Scaling and Offset Mismatch the other is a common.

Get this from a library. Multi-level modulation codes and multi-stage decoding. [Shu Lin; United States. National Aeronautics and Space Administration.]. Block coded modulation schemes can be obtained by generalized concatenation of the modulation and block codes of length N.

The modulation is considered as a code in the euclidean space IR 2. One obtains a concatenated code in the euclidean space IR 2N using binary block codes. In this paper the obtained code is taken as an inner code, which is.

adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A. Sign-Bit Shaping Using Polar Codes. 10/29/ ∙ by Onurcan İşcan, et al. ∙ 0 ∙ share. A new polar coding scheme for higher order modulation is presented.

The proposed scheme is based on multi-level coding (MLC) with natural labeling, where the bit-level corresponding to the sign-bit is generated in dependence on the previous bit-levels, such that.

Nicolas, J.J. and Vucetic B., ‘Performance of MPSK Trellis Codes over Nonlinear Fading Mobile Satellite Channels, International Conference on Communication Systems', Conference Proceedings Singapore ICCS'88, pp–, Singapore, November.

The multilevel modulation codes constructed by this method allow the use of multi-stage decoding procedures that provide good trade-off between performance and decoding complexity. In this paper, constructions of multilevel modulation codes for both the AWGN and the Rayleigh fading channels are discussed.Multilevel block coded modulation and multistage decoding based on unconventional partitionings have been investigated in [1] [2] to achieve .Abstract: This paper describes how block-coded modulation (BCM) and multiple BCM (MBCM) with Viterbi decoding can be designed for use in Rayleigh fading and severe Rician fading channels.

New codes are developed by modifying known codes to increase the minimum symbol distance, which is one of the distances that has a strong effect on the bit.