Low-Complexity Hybrid Time-Frequency Audio Signal Pattern Detection

Low-Complexity Iterative Detection for Orthogonal Time Frequency Space Modulation

We elaborate on the recently proposed orthogonal time frequency space (OTFS) modulation technique, which provides significant advantages over orthogonal frequency division multiplexing (OFDM) in Doppler channels. We first derive the input–output relation describing OTFS modulation and demodulation (mod/demod) for delay–Doppler channels with arbitrary number of paths, with given delay and Dopple...

Low-Complexity Audio Signal Processing for Localization in Indoor Scenarios

During the last years, wireless sensor networks (WSNs) have received significant attention from the research community, as one of the emerging technologies for the new millennium. A WSN is composed by many (e.g., hundreds) devices with limited processing and communication capabilities. Therefore, energy saving is one of the major issues and information processing has to be performed with low co...

Bayesian Estimation of Time-Frequency Coefficients for Audio Signal Enhancement

The Bayesian paradigm provides a natural and effective means of exploiting prior knowledge concerning the time-frequency structure of sound signals such as speech and music—something which has often been overlooked in traditional audio signal processing approaches. Here, after constructing a Bayesian model and prior distributions capable of taking into account the time-frequency characteristics...

Chapter 12 Signal Detection Using Time - Frequency

Signal Existence Verification (SEV) for GPS Low Received Power Signal Detection Using the Time-Frequency Approach

The detection of low received power of global positioning system (GPS) signals in the signal acquisition process is an important issue for GPS applications. Improving the miss-detection problem of low received power signal is crucial, especially for urban or indoor environments. This paper proposes a signal existence verification (SEV) process to detect and subsequently verify low received powe...