Adaptive DFE for GMSK in indoor radio channels

Tellado-Mourelo, Jose; Wesel, E.K.; Cioffi, J.M.

doi:10.1109/49.490234

Cited by 44 publications

(13 citation statements)

References 26 publications

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“…Schober radio local area networks (HIPERLANs) [7]- [9]. Noncoherent equalizers have also been reported in [10]- [23].…”

Section: Introductionmentioning

confidence: 97%

“…In most noncoherent receivers for ISI channels differential detection (DD) precedes equalization [5], [7]- [9], [11], [13], [15], [17], [19]. While this approach guarantees a low receiver complexity, it also implies a large performance penalty in strongly frequency-selective channels (e.g., [6]).…”

Section: Introductionmentioning

confidence: 99%

“…Efficient noncoherent decision-feedback equalization (NDFE) and noncoherent sequence estimation (NSE) have been derived in [22] and [18], [20], respectively. Noncoherent equalization and antenna diversity has been considered previously in [7]- [9], [17], [28]. However, since in these receivers DD precedes the linear combination of the diversity branches, nonlinear ISI, ACI, and CCI is generated and the potential of ST processing is not fully exploited.…”

Section: Introductionmentioning

confidence: 99%

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Noncoherent space-time equalization

Schober

Pasupathy

2003

IEEE Trans. Wireless Commun.

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In this paper, noncoherent equalization is combined with multiple receive antennas. The resulting noncoherent space-time equalization (NSTE) schemes are analyzed and compared with the corresponding coherent receivers. In particular, noncoherent linear equalization (NLE), noncoherent decisionfeedback equalization (NDFE), and noncoherent sequence estimation (NSE) are considered. For NLE and NDFE novel approximations for the signal-to-distortion ratio (SDR) are derived and verified by simulations. It is shown that NSTE can suppress interfering users and exploit diversity as efficiently as coherent STE. However, NSTE is more robust against channel phase variations than the combination of coherent STE and synchronization. Robust noncoherent recursive least squares (NC-RLS) algorithms, which compare favorably with the conventional RLS algorithm with additional carrier synchronization loop, are proposed for fast filter adaptation.

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“…Schober radio local area networks (HIPERLANs) [7]- [9]. Noncoherent equalizers have also been reported in [10]- [23].…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Noncoherent space-time equalization

Schober

Pasupathy

2003

IEEE Trans. Wireless Commun.

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“…Using analytical and simulation based techniques researchers have investigated a number of different approaches to the problem of high speed wireless indoor data communications. These include systems based on GMSK with equalization [2], COFDM [3], and equalized QAM modulation [5]- [7]. Invariably these studies have made certain simplifying assumptions regarding the channel and/or the modem.…”

Section: Introductionmentioning

confidence: 99%

Predicting the results of 10 Mbps-30 Mbps wireless field trials using simulation techniques

Kim

Daneshrad²,

Valenzuela³

1999 IEEE International Conference on Communications (Cat. No. 99CH36311)

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The accuracy with which simulation techniques can be used to predict the performance of an experimental high speed M-QAM testbed in typical indoor wireless environments is studied in this paper. Ray tracing techniques were used to produce impulse responses for specific transmit and receive antenna locations where actual measurements were taken using a highly versatile equalized M-QAM testbed operating at 10 Mbps, 20 Mbps and 30 Mbps [l]. The results obtained using a simulation of the testbed plus the ray-traced channel are compared with those obtained with experimental field trials. The paper presents the results of such comparisons for a total of 2,322 trials, where a trial is defined as a simulation run plus a field test for a given data rate and antenna location. The study shows that when quantization noise is factored into the simulation, the performance predicted using the simulation approach closely matches the experimental data.

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“…To cope with the effects of the multipath propagation for high data rate applications, it is possible to implement Orthogonal Frequency Division Multiplexing (OFDM) systems [1] or single carrier systems with adaptive equalization [2] to reduce the intersymbol interference produced by multipaths. The effect of phase noise on the performance of OFDM systems has been considered in many papers [3][4][5] with different approaches revealing significant performance degradations.…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization of High Order QAM in Presence of Phase Noise and AWGN: Application to a Decision Directed Frequency Synchronization System

Bougeard

Hélard

Siaud

2006

Wireless Pers Commun

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The paper presents an analysis of the impact of Local Oscillators (LO) phase noise on the performance of digital transmission systems. Using an efficient phase noise model, we study degradations induced by phase noise and Additive White Gaussian Noise (AWGN) on a carrier recovery system combined to high order Quadrature Amplitude Modulations (QAM). Simulation results show that an optimum trade-off between AWGN and phase noise robustness for the loop bandwidth can be determined. In order to compare simulated and analytical performance, a new general expression of the bit error probability is developped for square QAM in the presence of phase noise over Gaussian channel. Furthermore, novel decision areas related to Quadrature Amplitude Modulations are determined in order to improve the performance of the carrier recovery algorithm in the presence of phase noise and frequency offset.

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Adaptive DFE for GMSK in indoor radio channels

Cited by 44 publications

References 26 publications

Noncoherent space-time equalization

Noncoherent space-time equalization

Predicting the results of 10 Mbps-30 Mbps wireless field trials using simulation techniques

Performance Optimization of High Order QAM in Presence of Phase Noise and AWGN: Application to a Decision Directed Frequency Synchronization System

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