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block-coded modulation and noncoherent detection for impulse radio UWB

IEEE SIGNAL PROCESSING LETTERS 2008年 15卷 112-115页

作者： Ying, Yeqiu Ghogho, Mounir Swami, Ananthram Univ Leeds Sch Elect & Elect Engn Leeds LS2 9JT W Yorkshire England USA Res Lab Adelphi MD 20783 USA

Noncoherent receivers are favored for UWB-IR systems because of their low implementation complexity compared with coherent correlation receivers. However, existing noncoherent schemes, such as transmitted reference (TR) systems and frame-level differential receivers (FDR), suffer from performance degradation and energy efficiency loss. We propose to use block-coded modulation and develop a novel energy detection-based noncoherent reception scheme for UWB-IR systems. Our scheme is capable of effective noise/interference mitigation without loss of energy efficiency and data rate. Performance evaluation shows that even in the presence of strong inter-frame interference and multiuser interference, our scheme is robust.

关键词： block-coded modulation impulse radio (IR) non-coherent reception ultra-wideband (UWB)

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block-coded modulation and multiple block-coded modulation with viterbi decoding for fading channels

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2001年第2期19卷 202-210页

作者： Li, HB Wakana, H Tanaka, M Commun Res Lab Ibaraki Osaka Japan

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 have a strong effect on the bit error rate (BER) performance under fading channels. Combined with anti-fading techniques such as fading compensation, interleaving, and branch weighting, the new codes significantly improve BER performance. Computer simulations were used to confirm the code performance.

关键词： block-coded modulation fading channels multiple block coded modulation Viterbi decoding

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Rate gains in block-coded modulation systems with interblock memory

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IEEE TRANSACTIONS ON INFORMATION THEORY 2000年第3期46卷 851-868页

作者： Peng, CN Chen, HS Coffey, JT Williams, RGC Texas Instruments Inc Broadband Access Grp San Jose CA 95124 USA Natl Chi Nan Univ Dept Elect Engn Nantou 545 Taiwan Univ Michigan Dept Elect Engn & Comp Sci Ann Arbor MI 48109 USA 3COM San Diego CA 92128 USA

This paper examines the performance gains achievable by adding interblock memory to, and altering the mapping of coded bits to symbols in, block-coded modulation systems, The channel noise considered is additive Gaussian, and the twin design goals are to maximize the asymptotic coding gain and to minimize the number of apparent nearest neighbors. In the case of the additive white Gaussian noise channel, these goals translate into the design of block codes of a given weighted or 'normalized' distance whose rate is as high as possible, and whose number of codewords at minimum normalized distance is low The effect of designing codes for normalized distance rather than Hamming distance is to ease the problem of determining the best codes for given parameters in the cases of greatest interest, and many such best codes are given.

关键词： block-coded modulation code constructions gluing multilevel codes normalized distance split weight enumerators

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On block-coded modulation with interblock memory

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IEEE TRANSACTIONS ON COMMUNICATIONS 1997年第11期45卷 1401-1411页

作者： Lin, MC Wang, JY Ma, SC NATL TAIWAN UNIV DEPT ELECT ENGNTAIPEI 106TAIWAN DIGITAL VIDEO BROADCAST SYST DEPT COMP & COMMUN RES LABSIND TECHNOL RES INSTHSINCHU 310TAIWAN

block-coded modulation with interblock memory (BCMIM) is a variation of block-coded modulation (BCM) which is designed for multilevel coding, By providing interblock memory between adjacent blocks, the coding rate of a BCMIM scheme can be increased without decreasing the minimum squared Euclidean distance (MSED) as compared to the original BCM, In an early version of BCMIM, interblock coding is provided only between the first two coding levels of adjacent blocks, In this paper, we design BCMIM with a more general form for which interblock coding ran be introduced among many coding levels, In this way, we can further increase the coding rate of BCMIM without decreasing the MSED, We provide many examples to show the advantages of BCMIM with the general form, Most of the examples are designed based on multidimensional signal sets, since a multidimensional signal set can provide more coding levels than a two-dimensional (2-D) signal set.

关键词： block-coded modulation coded modulation coding interblock coding

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Practical 8-PSK block-coded modulation with convolutional codes and soft decision block codes for packet networks

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IEE PROCEEDINGS-COMMUNICATIONS 1998年第4期145卷 218-226页

作者： Thesling, WH Xiong, F Vanderaar, MJ Cleveland State Univ Dept Elect Engn Cleveland OH 44115 USA NYMA Inc Brookpark OH 44142 USA

The design and performance of a class of practical rate 2/3, 8-PSK block-coded modulation (BCM) (also referred to as multilevel modulation codes) schemes are presented. These BCM schemes utilise both convolutional codes and block codes, and have block lengths that are matched with relatively short packet lengths to satisfy requirements in packet-wireless networks. Decoding issues such as optimum signal metrics and soft-decision decoding of block codes are addressed. Performance is evaluated and simulated. It is found that these BCM schemes exhibit a coding gain comparable to 16, 32 and 64 state Ungerboeck TCM codes, but require less complexity to decode.

关键词： packet networks block-coded modulation soft-decision decoding

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Performance Analysis of UWB Noncoherent Receiver with block-coded modulation Scheme

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IEEE COMMUNICATIONS LETTERS 2010年第6期14卷 509-511页

作者： Mu, Dazhong Qiu, Zhengding Zhang, Xiong Beijing Jiaotong Univ Inst Informat Sci Beijing 100044 Peoples R China

Recently, an energy efficient noncoherent receiver scheme, called codeword matching and signal aggregation (CMSA), has been proposed for ultra-wideband (UWB) communications. However, its optimality and analytical error performance have not been studied. This letter shows the CMSA receiver is the optimal receiver in the sense of generalized likelihood ratio test (GLRT) and presents closed-form upper bound expression for bit error probability (BEP).

关键词： block-coded modulation noncoherent receiver upper bound bit error probability ultra-wideband (UWB)

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Reduced-tree-based soft decoding for block-coded modulation

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IEE PROCEEDINGS-COMMUNICATIONS 1997年第2期144卷 79-83页

作者： Jadhav, A Siddiqi, M Department of Electrical Engineering Indian Institute of Technology Kanpur India

It is shown that soft maximum-likelihood decoding for block-coded modulation (BCM) can be performed using the code tree. It is easy to generate the code tree for any type of block code, linear as well as nonlinear. A reduce tree is obtained from the code tree. The trellis for a block code can be obtained from the reduced tree. Using this structure to perform computations in parallel, a scheme is proposed for the implementation of the soft decoder. Back tracking, necessary in a soft decoder using the Viterbi algorithm on a trellis, is eliminated.

关键词： decoding reduced-tree-based methods trellises block-coded modulation

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block-coded M-PSK modulation OVER GF(M)

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IEEE TRANSACTIONS ON INFORMATION THEORY 1993年第2期39卷 337-346页

作者： ISAKSSON, M ZETTERBERG, LH ROYAL INST TECHNOL DEPT TELECOMMUN THEORY S-10044 STOCKHOLM 70 SWEDEN

Channel codes where the redundancy is obtained not from parity symbols, but from expanding the channel signal-set, are dealt with. They were initially proposed by Ungerboeck using a convolutional code. Here, a block coding approach is given. Rate m/(m + 1) coded 2m + 1-ary PSK is considered. The expanded signal-set is given the structure of a finite field. The code is defined by a square nonsingular circulant generator matrix over the field. Binary data is mapped on a dataword, of the same length as the codewords, over an additive subgroup of the field. The codes using trellises are described, and then the Viterbi algorithm for decoding is applied. The asymptotic coding gain ranges from 1.8 to 6.0 dB for QPSK going from blocklength 3 to 12. For 8-PSK, the gain is from 0.7 to 3.0 dB with blocklength 4 to 8. With only four states in the trellis, codes of any length for QPSK and 8-PSK are constructed, each having an asymptotic coding gain of 3.0 dB. Simulation results are presented. It is found that the bit-error rate performance at moderate signal-to-noise ratios is sensitive to the number of nearest and next-nearest neighbors.

关键词： block-coded modulation EXPANDED SIGNAL-SETS PHASE-SHIFT KEYING TRELLIS

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Further Results on Noncoherent block-coded MPSK

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IEEE TRANSACTIONS ON COMMUNICATIONS 2008年第10期56卷 1616-1625页

作者： Wei, Ruey-Yi Chen, Yen-Ming Natl Cent Univ Dept Commun Engn Jhongli Taiwan

A novel noncoherent block coding scheme, called noncoherent block-coded MPSK (NBC-MPSK), was proposed recently. In this paper, we present further research results on NBC-MPSK. We first focus on the rotational invariance (RI) of NBC-MPSK. Based on the RI property of NBC-MPSK with multistage decoding, a noncoherent near-optimal linear-complexity multistage decoder for NB,C-MPSK is proposed. Then we investigate a tree-search ML decoding algorithm for NBC-MPSK. The derived algorithm is shown to have low complexity and excellent error performance. In this paper, we also utilize the idea of the NBC-MPSK to design noncoherent space-time block codes, called noncoherent space-time block-coded MPSK (NSTBC-MPSK). For two transmit antennas, we propose a signal set with set partitioning and derive the minimum noncohent distance of NSTBC-MPSK with this signal set. For the decoding of NSTBC-MPSK, we modify the NIL decoding algorithm of NBC-MPSK and propose an iterative hard-decision decoding algorithm. Compared with training codes and unitary space-time modulation, NBC-MPSK and NSTBC-MPSK have larger minimum noncoherent distance and thus better error performance for the noncoherent NIL decoder.

关键词： Noncoherent detection phase-shift keying (PSK) block-coded modulation space-time code

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Noncoherent block-coded MPSK

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IEEE TRANSACTIONS ON COMMUNICATIONS 2005年第6期53卷 978-986页

作者： Wei, RY Natl Cent Univ Dept Commun Engn Chungli 320 Taiwan

For coherent detection, block-coded modulation is a bandwidth efficient scheme. In this paper, we propose theorems about the error performance of block-coded modulation using M-ary phase-shift keying (MPSK) for noncoherent detection. Based on these theorems, we propose a novel block-coded modulation scheme for noncoherent detection called noncoherent block-coded MPSK. The proposed scheme provides flexible designs of noncoherent block codes with different code rate, block length and error performance. Good noncoherent block codes can be easily obtained by properly choosing binary linear block codes as the component codes. Moreover, noncoherent block codes of this new scheme can be decoded by multistage decoding, which has the advantage of low complexity and satisfactory error performance. In this paper, two algorithms of multistage decoding for noncoherent detection are proposed as well. The error performance of some designed codes and decoding algorithms is verified by computer simulation.

关键词： block-coded modulation multilevel coding non-coherent detection phase-shift keying (PSK)

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