• Publications
  • Influence
A robust timing and frequency synchronization for OFDM systems
TLDR
A robust symbol-timing and carrier-frequency synchronization scheme applicable to orthogonal frequency-division-multiplexing systems is presented and a new performance measure is introduced for timing estimation, based on the plot of signal to timing-error-induced average interference power ratio against the timing estimate shift.
On timing offset estimation for OFDM systems
TLDR
Two timing offset estimation methods for orthogonal frequency division multiplexing (OFDM) systems as modifications to Schmidl and Cox's method are presented and both have significantly smaller estimator variance in both channel conditions.
An investigation into time-domain approach for OFDM channel estimation
TLDR
A time-domain based channel estimation for OFDM system with pilot-data multiplexed scheme and simulation results show that proposed method achieves almost the same performance as DFT-based LMMSE method and better BER performance than the other methods while keeping less complexity.
Real-Time Sleep Apnea Detection by Classifier Combination
  • Baile Xie, H. Minn
  • Computer Science
    IEEE Transactions on Information Technology in…
  • 1 May 2012
TLDR
This paper investigates real-time sleep apnea and hypopnea syndrome detection based on electrocardiograph and saturation of peripheral oxygen signals, individually and in combination and proposes classifier combination to further enhance the classification performance by harnessing the complementary information provided by individual classifiers.
Apnea MedAssist: Real-time Sleep Apnea Monitor Using Single-Lead ECG
TLDR
A low-cost, real-time sleep apnea monitoring system that uses patient's single channel nocturnal ECG to extract feature sets, and uses the support vector classifier (SVC) to detect apnea episodes with a high degree of accuracy for both home and clinical care applications.
Optimal training signals for MIMO OFDM channel estimation
TLDR
This paper presents general classes of optimal training signals for the estimation of frequency-selective channels in MIMO OFDM systems and designs can be applied to pilot-only schemes as well as pilot-data-multiplexed schemes.
Digital Compensation of Frequency-Dependent Joint Tx/Rx I/Q Imbalance in OFDM Systems Under High Mobility
TLDR
This work develops a unified mathematical framework to characterize, estimate, and jointly mitigate ICI due to I/Q imbalance and high mobility, and derives a closed-form expression for the degradation in signal-to-interference-plus-noise ratio (SINR) due to the impairments.
A combined timing and frequency synchronization and channel estimation for OFDM
TLDR
The simulation results show that the proposed combined approach performs quite well, and circumvents the problem of mismatch among individual synchronization tasks.
Initial uplink synchronization and power control (ranging process) for OFDMA systems
  • Xiaoyu Fu, H. Minn
  • Computer Science
    IEEE Global Telecommunications Conference…
  • 29 November 2004
TLDR
The proposed ranging method works well even in the presence of several simultaneous random-access users and is robust to other data-users' interference and the simplicity of the proposed method is also quite appealing.
An Exact Error Probability Analysis of OFDM Systems with Frequency Offset
In this paper, we derive exact closed form bit error rate (BER) or symbol error rate (SER) expressions for OFDM systems with carrier frequency offset (CFO). We consider the performance of an OFDM
...
...