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Future 5G mobile networks are expected to support high numbers of simultaneously connected devices and to achieve high system spectrum efficiency at low power consumption. To attain these goals, device-to-device (D2D) communication is a key component. We allow any cellular user equipment to share its radio resource with multiple D2D devices and then develop the MiSo algorithm, which considers spectrum...
Multi-User Multiple Input Multiple Output (MU-MIMO) enables a multi-antenna access point (AP) to serve multiple users simultaneously, and has been adopted as the IEEE 802.11ac standard. While several PHY-MAC designs have recently been proposed to improve the throughput performance of a MU-MIMO WLAN, they, however, usually assume that all the concurrent streams are of roughly equal length. In reality,...
Compared to current mobile networks, next-generation mobile networks are expected to support higher numbers of simultaneously connected devices and to achieve higher system spectrum efficiency and lower power consumption. To achieve these goals, we study the multi-sharing device-to-device (D2D) communication, which allows any cellular user equipment to share its radio resource with multiple D2D devices...
This paper presents a novel noise robustness method, nonnegative matrix factorization-based noise suppression (NNS), to enhance the magnitude spectrum of speech signals for better speech recognition performance in noise-corrupted environments. In the presented approach, the clean data and noise in the training set are firstly converted to the spectrograms via short-time Fourier transform (STFT), and...
The concept of the two-dimensional spectro-temporal modulation filtering of the auditory model [1] is implemented for the FFT spectrogram. It analyzes the spectrogram in terms of the temporal dynamics and the spectral structures of the sound. The overlap and add (OLA) method, which is more convenient and reliable than the iterative-projection method proposed in [1], is used to invert the FFT spectrogram...
A novel optimization procedure for the location of transmitting antenna in ultra-wideband (UWB) wireless communication systems is presented. The impulse responses of different transceiver locations are computed by ray-tracing techniques and inverse fast Fourier transform (IFFT). By using the impulse responses of these multi-path channels, the bit error rate (BER) performance for binary pulse amplitude...
This paper proposes a frequency-based approach for background noise suppression with consideration for human psychoacoustics. The approach utilizes a perceptual cost function analysis based on temporal masking thresholds. By optimizing the cost function, the concept eliminates background noises that mask the original signals, while maintaining the minimum perceptual distortion of the original signals...
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