Performance of Decision Feedback Equalizers in Simulated Urban and Indoor Radio Channels

Theodore S. RAPPAPORT; Weifeng HUANG; Martin J. FEUERSTEIN

Performance of Decision Feedback Equalizers in Simulated Urban and Indoor Radio Channels

Theodore S. RAPPAPORT, Weifeng HUANG, Martin J. FEUERSTEIN

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A Decision Feedback Equalizer (DFE) structure with a varying number of tap lengths was used with a recursive least squares (RLS) algorithm to determine tradeoffs between equalizer size and performance in mobile and portable digital radio systems. A mobile channel simulator, SMRCIM, was used to demonstrate how much an equalizer can improve the BER in real world urban channels. The results show that at 850MHz, the DFE is unable to improve the BER when the mobile terminal exceeds speeds of 115km/h for U.S. Digital Cellular systems. The performance of adaptive equalization for indoor high data rate systems was evaluated using the indoor channel simulator SIRCIM, and we found that DFEs have excellent performance for indoor radio channels. For simple structures, the BER is less than 10^-3 at 15dB E_b/N_O using coherent QPSK modulation. Finally, an equalizer structure for non-coherent π/4 DQPSK modulation was developed and simulation results are presented.

Publication: IEICE TRANSACTIONS on Communications Vol.E76-B No.2 pp.78-89

Publication Date: 1993/02/25

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Type of Manuscript: Special Section INVITED PAPER (Special Issue on Land Mobile/Portable Propagation)

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Theodore S. RAPPAPORT, Weifeng HUANG, Martin J. FEUERSTEIN, "Performance of Decision Feedback Equalizers in Simulated Urban and Indoor Radio Channels" in IEICE TRANSACTIONS on Communications, vol. E76-B, no. 2, pp. 78-89, February 1993, doi: .
Abstract: A Decision Feedback Equalizer (DFE) structure with a varying number of tap lengths was used with a recursive least squares (RLS) algorithm to determine tradeoffs between equalizer size and performance in mobile and portable digital radio systems. A mobile channel simulator, SMRCIM, was used to demonstrate how much an equalizer can improve the BER in real world urban channels. The results show that at 850MHz, the DFE is unable to improve the BER when the mobile terminal exceeds speeds of 115km/h for U.S. Digital Cellular systems. The performance of adaptive equalization for indoor high data rate systems was evaluated using the indoor channel simulator SIRCIM, and we found that DFEs have excellent performance for indoor radio channels. For simple structures, the BER is less than 10^-3 at 15dB E_b/N_O using coherent QPSK modulation. Finally, an equalizer structure for non-coherent π/4 DQPSK modulation was developed and simulation results are presented.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/e76-b_2_78/_p

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@ARTICLE{e76-b_2_78,
author={Theodore S. RAPPAPORT, Weifeng HUANG, Martin J. FEUERSTEIN, },
journal={IEICE TRANSACTIONS on Communications},
title={Performance of Decision Feedback Equalizers in Simulated Urban and Indoor Radio Channels},
year={1993},
volume={E76-B},
number={2},
pages={78-89},
abstract={A Decision Feedback Equalizer (DFE) structure with a varying number of tap lengths was used with a recursive least squares (RLS) algorithm to determine tradeoffs between equalizer size and performance in mobile and portable digital radio systems. A mobile channel simulator, SMRCIM, was used to demonstrate how much an equalizer can improve the BER in real world urban channels. The results show that at 850MHz, the DFE is unable to improve the BER when the mobile terminal exceeds speeds of 115km/h for U.S. Digital Cellular systems. The performance of adaptive equalization for indoor high data rate systems was evaluated using the indoor channel simulator SIRCIM, and we found that DFEs have excellent performance for indoor radio channels. For simple structures, the BER is less than 10^-3 at 15dB E_b/N_O using coherent QPSK modulation. Finally, an equalizer structure for non-coherent π/4 DQPSK modulation was developed and simulation results are presented.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - Performance of Decision Feedback Equalizers in Simulated Urban and Indoor Radio Channels
T2 - IEICE TRANSACTIONS on Communications
SP - 78
EP - 89
AU - Theodore S. RAPPAPORT
AU - Weifeng HUANG
AU - Martin J. FEUERSTEIN
PY - 1993
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E76-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 1993
AB - A Decision Feedback Equalizer (DFE) structure with a varying number of tap lengths was used with a recursive least squares (RLS) algorithm to determine tradeoffs between equalizer size and performance in mobile and portable digital radio systems. A mobile channel simulator, SMRCIM, was used to demonstrate how much an equalizer can improve the BER in real world urban channels. The results show that at 850MHz, the DFE is unable to improve the BER when the mobile terminal exceeds speeds of 115km/h for U.S. Digital Cellular systems. The performance of adaptive equalization for indoor high data rate systems was evaluated using the indoor channel simulator SIRCIM, and we found that DFEs have excellent performance for indoor radio channels. For simple structures, the BER is less than 10^-3 at 15dB E_b/N_O using coherent QPSK modulation. Finally, an equalizer structure for non-coherent π/4 DQPSK modulation was developed and simulation results are presented.
ER -