Trellis-coded CPFSK and soft-decision feedback equalization for micro-cellular wireless applications

Zhuang, Wei; Krzymien, W.A.; Goud, P.A.

doi:10.1007/bf01098871

Cited by 6 publications

(2 citation statements)

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“…1) Define the spiral curve for the current transmitted symbol based on and according to (11). 2) Calculate the ISI component based on previously transmitted symbols and the estimated channel impulse response defined in (1).…”

Section: ) Using Adaptivementioning

confidence: 99%

Phase precoding for frequency-selective Rayleigh and Rician slowly fading channels

Zhuang

Huang

1997

IEEE Trans. Veh. Technol.

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This paper presents a novel phase precoding (preequalization) technique to equalize frequency-selective Rayleigh and Rician slowly fading channels for personal communication systems using phase modulation. In order to achieve intersymbol interference (ISI)-free transmission, the precoding technique predistorts the signal transmitted from a base station to a portable unit. The novelty of the technique lies in using a spiral curve design: 1) to ensure the stability of the precoder even in equalizing a non minimum-phase channel; 2) to obtain an ISI-free received signal; and 3) to keep a constant transmitted signal amplitude. Using the precoder can improve the bit-error-rate (BER) transmission performance without increasing the complexity of the portable unit receiver. The BER performance of coherent quadrature phase-shift-keying (QPSK) with the channel pre-equalization is analyzed theoretically for both Rayleigh and Rician fading channels. Analytical and simulation results demonstrate that coherent QPSK using the proposed channel precoder has a significantly lower BER than that using a conventional decisionfeedback equalizer (DFE) because the precoder does not suffer from error propagation.

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Section: ) Using Adaptivementioning

confidence: 99%

Phase precoding for frequency-selective Rayleigh and Rician slowly fading channels

Zhuang

Huang

1997

IEEE Trans. Veh. Technol.

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“…The multipath propagation introduces fading and delay spread to the transmitted signals. At a high-transmission rate, the delay spread results in intersymbol interference (ISI) which can significantly degrade the transmission performance [1]. Channel equalization is an efficient approach to combating the effect of ISI, and decision feedback equalizer (DFE) is the most popular nonlinear equalizer for severe fading channels [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Channel precoding for indoor radio communications using dimension partitioning

Chan¹,

Zhuang

1999

IEEE Trans. Veh. Technol.

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In this paper, a new phase precoding technique is developed to combat the intersymbol interference (ISI) resulting from a frequency-selective slowly fading channel in a personal communication system using quadrature phase-shift keying (QPSK). Based on a new dimension partitioning technique, the precoder predistorts only the phase of the transmitted signal to keep a constant transmitted signal amplitude and, therefore, to ensure the stability of the precoder even in equalizing a nonminimum-phase channel. Under the constraint of the constant amplitude, the dimension partitioning method is developed to guarantee the possibility of correct detection for all transmitted information symbols and to further improve the transmission accuracy by increasing the size of decision regions. Analytical and simulation results demonstrate that over frequency-selective Rayleigh and Rician fading channels, the system using the proposed channel precoder can achieve a bit error rate (BER) comparable with that using a conventional decision feedback equalizer (DFE). The precoder can outperform DFE in an indoor environment where there is a strong direct propagation path. The main advantage of using the precoder is that the impairment of ISI due to multipath propagation on the transmission performance can be mitigated without increasing the complexity of the portable unit receiver. The proposed technique is especially useful for personal communications, where ISI due to multipath fading channels can severely deteriorate the BER transmission performance and where the simplicity of portable units is a vital characteristic of the system.

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Zhuang

1998

Wireless Personal Communications

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Trellis-coded CPFSK and soft-decision feedback equalization for micro-cellular wireless applications

Cited by 6 publications

References 10 publications

Phase precoding for frequency-selective Rayleigh and Rician slowly fading channels

Phase precoding for frequency-selective Rayleigh and Rician slowly fading channels

Channel precoding for indoor radio communications using dimension partitioning

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