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检索条件"主题词=Modulation coding"

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A Bandwidth Efficient Constant Envelope modulation with Reed-Solomon coding

A Bandwidth Efficient Constant Envelope Modulation with Reed...

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Douglas J. Hermes Frank E. Kragh Department of Electrical and Computer Engineering Naval Postgraduate School Monterrey CA USA

ISBN: (纸本)9781424411894;1424411890

This paper presents Reed-Solomon (RS) coding applied to an innovative, constant envelope modulation technique that was originally developed by Resnikoff and Tigerman [1]. The general waveform and phaseform are presented as-well-as probability of bit error and symbol error expressions for uncoded binary and uncoded M-ary modulation, respectively. Bit error performance analysis is presented for the case of RS coded waveforms when the modulation symbol size (M) is less than the RS coded symbol size (Q). In addition, upper and lower performance bounds are derived for RS coded waveforms for M less than Q. Performance analysis curves are presented for the M = 8 and Q = 64 case. Finally, simulation results are also presented for the M = 8 and Q = 64 case that strongly agree with analysis.

关键词： Bandwidth modulation coding Reed-Solomon codes Performance analysis Waves Telephony Analytical models Phase modulation Forward error correction Continuous phase modulation

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Luby Transform coding Aided Bit-Interleaved Coded modulation for the Wireless Internet

Luby Transform Coding Aided Bit-Interleaved Coded Modulation...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： R. Y. S. Tee T. D. Nguyen S. X. Ng L.-L. Yang L. Hanzo School of ECS University of Southampton UK

Bit-Interleaved Coded modulation using Iterative Decoding (BICM-ID) is amalgamated with Luby Transform (LT) coding. The resultant joint design of the physical and data link layer substantially improves the attainable Bit Error Rate (BER) performance. A Cyclic Redundancy Check (CRC) combined with a novel Log-Likelihood Ratio (LLR) based packet reliability estimation method is proposed for the sake of detecting and disposing of erroneous packets. Subsequently, bit-by-bit LT decoding is proposed, which facilitates a further BER improvement at a lower number of BICM-ID iterations. Finally, we revisit the pseudo random generator function used for designing the LT generator matrix.

关键词： Transform coding Interleaved codes modulation coding Internet Cyclic redundancy check Iterative decoding Bit error rate Automatic repeat request Feedback Signal to noise ratio

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Joint Source coding, Unity Rate Precoding and FFH-MFSK modulation Using Iteratively Decoded Irregular Variable Length coding

Joint Source Coding, Unity Rate Precoding and FFH-MFSK Modul...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Sohail Ahmed Robert G. Maunder Lie-Liang Yang Soon Xin Ng Lajos Hanzo School of ECS University of Southampton UK

Serially concatenated and iteratively decoded irregular variable length coding (IrVLC) combined with preceded fast frequency hopping (FFH) M-ary frequency shift keying (MFSK) is considered. The proposed joint source and channel coding scheme is capable of low signal-to-noise ratio (SNR) operation in Rayleigh fading channels contaminated by partial band noise jamming (PBNJ). The IrVLC scheme is comprised of a number of component variable length coding (VLC) codebooks employing different coding rates for encoding particular fractions of the input source symbol stream. These fractions may be chosen with the aid of extrinsic information transfer (EXIT) charts in order to shape the inverted EXIT curve of the IrVLC codec so that it can be matched with the EXIT curve of the inner decoder. We demonstrate that using the proposed scheme near-zero bit error ratio may be achieved at low SNR values and the IrVLC based scheme yields a further gain of up to 0.3 dB over the identical-rate single-class VLC based benchmarker scheme

关键词： Source coding modulation coding Iterative decoding Signal to noise ratio Frequency shift keying Concatenated codes Channel coding Fading Noise shaping Jamming

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A Time-domain ICI Canceller Using modulation Order Increasing and Repetition coding in OFDM

A Time-domain ICI Canceller Using Modulation Order Increasin...

引用

IEEE 65th Vehicular Technology Conference (VTC-Spring 2007), vol.5

作者： Jeong-Wook Seo Seung-Hun Jang Won-Gi Jeon Jong-Ho Paik Min-Goo Kang Dong-Ku Kim DxB·Communication Convergence Research Center KETI Gyeonggi-do Korea School of Electrical and Electronic Eng. Yonsei University Seoul Korea Hanshin University Gyeonggi-do Korea

In this paper, an enhanced time-domain cancellation method is proposed for inter-carrier interference (ICI) reduction in OFDM systems. The conventional time-domain cancellation does not work well in deep fades. In order to supplement the conventional method, the simple repetition (de-)coding and the modulation order increasing are employed in the time-domain cancellation. The approximated repetition decoding provides reliable symbols in the regeneration operation, and the increased modulation order maintains the spectral efficiency. Simulation results indicate that the proposed method using 16QAM significantly improves the BER performance compared to the conventional method using QPSK, while maintains the spectral efficiency. Moreover, the proposed method using 64QAM concurrently improves both the BER performance and the spectral efficiency.

关键词： Time domain analysis modulation coding OFDM modulation Multipath channels Interference Maintenance Bit error rate Fading Delay Convergence

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Near-Capacity Transceiver Design Using Exit-Curve Fitting: Three-Stage Turbo Detection of Irregular Convolutional Coded Joint Sphere-Packing modulation and Space-Time coding

Near-Capacity Transceiver Design Using Exit-Curve Fitting: T...

引用

IEEE International Conference on Communications (ICC)

作者： O. Alamri J. Wang S. X. Ng L.-L. Yang L. Hanzo School of ECS University of Southampton UK

Conventional two-stage turbo-detected schemes typically suffer from a bit error rate (BER) floor, preventing them from achieving infinitesimally low BER values, especially, when the inner coding stage is of non-recursive nature. We circumvent this deficiency by proposing a three-stage turbo-detected sphere packing (SP) aided space-time block coding (STBC) STBC-SP scheme, where a rate-1 recursive inner precoder is employed to avoid having a BER floor. The convergence behaviour of this serially concatenated scheme is investigated with the aid of 3D extrinsic information transfer (EXIT) charts. Furthermore, the capacity of the STBC-SP scheme is shown and an algorithm is proposed for calculating a tighter upper bound on the maximum achievable bandwidth efficiency. The proposed three-stage turbo-detected scheme operates within about 1.0 dB of the capacity and within 0.5 dB of the maximum achievable bandwidth efficiency limit.

关键词： Transceivers Convolutional codes modulation coding Iterative decoding Bit error rate Concatenated codes Upper bound Diversity reception Convergence Bandwidth

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Adaptive Throughput Maximization for Adaptive modulation and coding Systems

Adaptive Throughput Maximization for Adaptive Modulation and...

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Asia-Pacific Conference on Communications

作者： Hsuan-Jung Su Tsungnan Lin Department of Electrical Engineering National Taiwan University Taipei Taiwan

It is well known that for delay-tolerant data services, adaptive transmission with the modulation and coding scheme (MCS) adjusted according to the instantaneous channel condition can maximize the throughput. In time-varying channels, the performance degradation of adaptive transmission caused by delayed or inaccurate channel condition feedback can be mitigated with the use of hybrid automatic repeat request (HARQ). With these two techniques jointly implemented, the selection of MCS becomes a complex process highly dependent on channel and system characteristics, and is usually difficult to be optimized analytically. In this paper, we investigate the conditions for throughput-maximizing MCS selection, then propose an algorithm capable of adaptively fulfilling these conditions during transmission

关键词： Throughput modulation coding Feedback Transmitters Error analysis Delay Decoding Automatic repeat request Time-varying channels Degradation

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Iteratively Decoded Irregular Variable Length coding and Trellis Coded modulation

Iteratively Decoded Irregular Variable Length Coding and Tre...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： R. G. Maunder J. Wang S. X. Ng L-L. Yang L. Hanzo School of ECS University of Southampton UK

In this paper we propose a novel Irregular Variable Length coding (IrVLC) scheme for near-capacity joint source and channel coding. We employ a number of Variable Length coding (VLC) component codebooks having different coding rates for encoding appropriately chosen fractions of the input source symbols. These fractions may be designed With the aid of EXtrinsic Information Transfer (EXIT) charts so that the EXIT curve shape of the IrVLC codec may be matched to that of a serially concatenated channel codec as closely as possible. In this way, an open EXIT chart tunnel may be created even at low E b /N 0 values that are close to the channel capacity. We detail the proposed serially concatenated and iteratively decoded IrVLC and Trellis Coded modulation (TCM) designs that are capable of operating within 0.6 dB of the uncorrelated narrowband Rayleigh fading channel's capacity at an effective bandwidth efficiency of 1.56 bit/s/Hz, assuming ideal Nyquist filtering. By contrast, the equivalent-rate VLC-based bench-marker schemes were found to be capable of operating at 1.1 dB from capacity, which is nearly double the discrepancy of the proposed IrVLC-TCM scheme.

关键词： Iterative decoding modulation coding Codecs Concatenated codes Channel capacity Channel coding Shape Narrowband Rayleigh channels Bandwidth

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Iteratively Detected Irregular Variable Length coding and Sphere-Packing modulation-Aided Differential Space-Time Spreading

Iteratively Detected Irregular Variable Length Coding and Sp...

引用

IEEE Vehicular Technology Conference

作者： Mohammed El-Hajjar Robert G. Maunder Osamah Alamri Soon X. Ng Lajos Hanzo Schoo of Eecronics nd Couer Science Universiy of Souhon SO17 1BJ UK

In this paper we consider serially concatenated and iteratively decoded Irregular Variable Length coding (IrVLC) combined with precoded Differential Space-Time Spreading (DSTS) aided multidimensional Sphere Packing (SP) modulation designed for near-capacity joint source and channel coding. The IrVLC scheme comprises a number of component Variable Length coding (VLC) codebooks having different coding rates for the sake of encoding particular fractions of the input source symbol stream. The relative length of these source-stream fractions can be chosen with the aid of EXtrinsic Information Transfer (EXIT) charts in order to shape the EXIT curve of the IrVLC codec, so that an open EXIT chart tunnel may be created even at low E{sub}b/N{sub}0 values that are close to the capacity bound of the channel. These schemes are shown to be capable of operating within 0.9 dB of the DSTS-SP channel's capacity bound using an average interleaver length of 113,100 bits and an effective bandwidth efficiency of 1 bit/s/Hz, assuming ideal Nyquist filtering. By contrast, the equivalent-rate regular VLC-based bench-marker scheme was found to be capable of operating at 1.4 dB from the capacity bound, which is about 1.56 times the corresponding discrepancy of the proposed IrVLC-aided scheme.

关键词： modulation coding Channel estimation Channel capacity Sociotechnical systems Concatenated codes Iterative decoding Multidimensional systems Diversity reception Multiaccess communication Costs

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Session B1: coding and modulation

Session B1: Coding and Modulation

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IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

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Loss differentiation and improved SNR estimates at the physical layer in wireless LANs

Loss differentiation and improved SNR estimates at the physi...

引用

IEEE Globecom Workshops

作者： Sam Keene Jeffrey B. Carruthers Department of Electrical and Computer Engineering Boston University USA

Collisions, sudden fades, and wireless channel errors are a significant source of packet loss in wireless LANs. However, higher level protocols typically have no way to determine the cause of packet loss, and generally make assumptions about the source of packet failure that may be incorrect. Accurate information about the source of packet loss could be valuable information to an upper layer. In addition, Collisions and fades adversely affect SNR estimation algorithms, which are also useful for higher level protocols. We propose a physical layer algorithm that can both isolate the cause of packet loss, be it noise, collision or fade, and accurately determine the actual SNR regardless if the packet has been corrupted by collision or fade.

关键词： Physical layer Wireless LAN Signal to noise ratio Performance loss Additive white noise Gaussian noise Fading Access protocols Wireless application protocol modulation coding

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