Trellis coded communication systems-colored noise and the swapping technique

Wang, J.-D.; Chung, H.Y.

doi:10.1109/26.61396

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…Computing the error probability of MLSE using the minimum Euclidean distance between the transmitted and the incorrect sequence as in [8] is not accurate since the noise at the output of MMSE-LE is colored. With colored noise, error events with the same squared Euclidean distance affect error probability differently since the order of the error sequence also impacts the error probability [9]. Thus, the performance results are obtained by computer simulation.…”

Section: B Fir Mmse-lementioning

confidence: 99%

Direct-conversion RF receiver design

Namgoong

Meng

2001

IEEE Trans. Commun.

102

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Direct-conversion radio-frequency receiver architecture promises superior performances in power, size, and cost over existing superheterodyne-based receivers. The use of direct-conversion receiver (DCR) architecture, however, has been limited due to two well-known problems, namely, the 1=f noise and the direct-current offset noise, to which conventional architectures are less sensitive. This paper analyzes these noise effects on reception performance of a DCR with alternating-current (ac) coupling filter in the receive path. A mathematical treatment of the performance of a DCR is provided. A performance bound of a DCR given its 1=f noise roll-off frequency and ac-coupling filter cutoff frequency is first obtained using vector coding. Then, the performance of a more practical adaptive reception method using a linear equalizer is discussed. Adaptability is especially important in rapidly time-varying channels such as in the wireless environment. Linear equalizer is effective at signal-to-noise ratios (SNRs) below 9 dB, but its performance degrades significantly at larger SNR. To achieve high performance at large SNR (9 dB), a spectrum shaping method using line codes for direct-conversion reception is proposed. This method achieves near-optimum direct-conversion reception at high SNR while maintaining low complexity and adaptability at the receiver.

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Section: B Fir Mmse-lementioning

confidence: 99%

Direct-conversion RF receiver design

Namgoong

Meng

2001

IEEE Trans. Commun.

102

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“…The communication systems using MLSE decoding which are corrupted by colored noise, their performance, depending on the polarity of the noise correlation, can either be improved or degraded with respect to the performance of the same system in AWGN of the same variance. J. Wang and H. Y. Chung [2] described an analytical approach for investigating the effect of noise correlation on trellis coded systems.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of modified/quadrature partial response‐trellis coded modulation (M/QPR‐TCM) systems

Uçan

1997

Trans Emerging Tel Tech

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In this paper, to improve bandwidth efficiency and error performance partial response signalling and trellis coded modulation is considered together of M-QAM systems. The new system proposal is denoted as ModifiedlQuadrature Partial Response-Trellis Coded Modulation (WQPR-TCM). Two new non-catastrophic schemes W6QPR-TCM and W9QPR-TCM are investigated for 4QAM. Error event lower bounds of the considered schemes are analyzed in AWGN and colored noise. Analytical upper bounds for the mobile fading channel with ideal channel state information (CSI) and infinite interleavingldeinterleaving are derived. The interesting result is that, the bit error probability upper bounds of the proposed M/QPR-TCM systems are better than the related QAM-TCM schemes for SNR values greater than a threshold.

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“…BP algorithm performance is usually evaluated under the assumption that the noise in the system is independent from the transmitted signals and that the noise components of any two samples are independent. However, in many communication systems the dominant noise sources are colored [7,8], hence making colored noise a major impairment that exists in practical communication channels. For instance, 10GBASE-T Ethernet needs to implement an equalization scheme to overcome the Inter-Symbol-Interference (ISI) caused by severe delay spreads in the CAT-6 UTP channel.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of LDPC codes in the presence of colored noise

Tehrani

Cockburn

Bates

PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, 2005.

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The class of Low Density Parity Check (LDPC) codes includes the most powerful capacity-approaching codes reported to date. As a result, LDPC codes have been considered for application in new communication standards such as 10GBASE-T Ethernet. However, the successful use of LDPC codes for such applications requires a better understanding of the effects of signal impairments on their error correction capabilities. In this paper, the performance of various LDPC codes in the presence of Additive Colored Gaussian Noise (ACGN) is evaluated and compared with the effects of conventional Additive White Gaussian Noise (AWGN). The simulation results provide insight into the performance of LDPC codes in real systems in which the noise components can indeed be correlated. In particular, our results show that at the same Signal-to-Noise Ratio (SNR), ACGN is more detrimental to the Bit Error Rate (BER) performance than AWGN.

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Trellis coded communication systems-colored noise and the swapping technique

Cited by 11 publications

References 9 publications

Direct-conversion RF receiver design

Direct-conversion RF receiver design

Performance analysis of modified/quadrature partial response‐trellis coded modulation (M/QPR‐TCM) systems

Performance evaluation of LDPC codes in the presence of colored noise

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