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GMM-UBM-based speaker verification heavily relies on a well trained UBM. In practice, it is not often easy to obtain an UBM that fully matches acoustic channels in operation. To solve this problem, we propose a novel sequential MAP adaptation approach: by being sequentially updated with data from new enrollments, the UBM learns and converges to the working channel. Our experiments are conducted on...
In orthogonal frequency division multiplexing (OFDM) systems, the estimated channel impulse response (CIR) can be recovered by transforming the initial channel frequency response (CFR) to time domain. The CIR is preferred to be filtered before transforming to frequency domain and using as accurate CFR. In orthogonal frequency division multiplexing access (OFDMA) systems, subcarriers are allocated...
In orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems, the sub-carriers, which span the spectrum used by licensed users (LUs), should be deactivated to avoid interference. The resulted OFDM system is called non-contiguous OFDM (NC-OFDM) system. For NC-OFDM systems, as no pilot symbols can be transmitted over these deactivated subcarriers, the conventional modified...
In reality, this is no such thing as perfect channel estimation. To improve the performance of multiple-input multiple-output (MIMO) detector under imperfect channel estimation, some novel detectors recently have been proposed by taking the channel estimation errors into account. However, all these existing detectors are with respect to maximal likelihood (ML) MIMO channel estimation. In this paper,...
Digital television/terrestrial multimedia broadcasting (DTMB), announced as the Chinese digital television terrestrial broadcasting (DTTB) standard, uses pseudo-noise (PN) sequence as guard interval (GI) and the training sequence for both multi- and single-carrier block transmissions. The conventional channel estimation methods can be performed through either the subtraction of the PN sequence or...
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