Hongwu Yang

• Doctor of Engineering
• Research Director at Northwest Normal University

Nonnative Mandarin speakers always have some unnatural pauses when speaking Mandarin due to their native pronunciation habits. Accurately predicting the prosodic structure of Chinese sentences is the key to improving fluency in Mandarin for nonnative speakers. This paper investigated the influence of the Chinese prosodic boundaries on the Mandarin...

Emotional speech synthesis is expected to make the synthesized speech more expressive. In order to synthesize more natural emotional speech signals, this paper presents a method to realize HMM based emotional speech synthesis using a Mandarin speech synthesis framework. A Mandarin context-dependent label format is adopted to label emotional sentenc...

This work studies a simultaneous wireless information and power transfer based downlink non-orthogonal multiple access (NOMA) network. The near user is equipped with a non-linear energy harvester, whose non-linear property is depicted by a piecewise linear model. An incremental cooperative NOMA (ICN) protocol is proposed to improve the performance...

In the study, a wireless energy harvesting-based two-unicast network is proposed. The proposed model consists of two source–destination pairs, in which two source nodes transmit information to their respective destination nodes via the help of the same relay node. Each transmission can be divided into two time slots each with the same time duration...

In the letter, a wireless energy harvesting (WEH) multicast network is proposed. Two source nodes communicate with their respective destination nodes via a WEH relay node. Adopting the power splitting relaying (PSR) protocol and analogue network coding (ANC), the relay node simultaneously harvests the energy and receives the information from the si...

Donggan language, which is a special variant of Mandarin, is used by Donggan people in Central Asia. Donggan language includes Gansu dialect and Shaanxi dialect. This paper proposes a convolutional neural network (CNN) based Donggan language speech recognition method for the Donggan Shaanxi dialect. A text corpus and a pronunciation dictionary were...

Part of speech (POS) tagging determines the attributes of each word, and it is the fundamental work in machine translation, speech recognition, information retrieval and other fields. For Tibetan part-of-speech (TPOS) tagging, a tagging method is proposed based on bidirectional long short-term memory with conditional random field model (BiLSTM_CRF)...

The authors study the sum rate of a two-unicast wireless energy harvesting system. The system consists of two source nodes, two destination nodes and one energy constrained relay node, which only harvests energy from the signals transmitted by the source nodes for its operation. Each source node transmits the signal to its corresponding destination...

This letter investigates a simultaneous wireless information and power transfer (SWIPT) based cooperative non-orthogonal multiple access (NOMA) system, where the near user close to the source node serves as a relay to help the far user. The near user adopts the power splitting (PS) protocol for harvesting energy and decoding the signals of both use...

This letter proposes a dynamic power splitting scheme (DPSS) for decode-and-forward (DF) based cooperative simultaneous wireless information and power transfer (SWIPT) networks with direct link. The relay node adopts an optimal dynamic power splitting factor determined by instantaneous channel state information (CSI) to harvest energy and process i...

In this paper, we consider a wireless energy harvesting network, where two source nodes exchange information via a decode-and-forward (DF) relay node. The network adopts the time switching relaying (TSR) or power splitting relaying (PSR) protocols. In the TSR protocol, transmitting process is split into three time slots. In the first time slot, two...

In a wireless energy harvesting network with an energy‐constrained decode and forward relay node, the authors propose a hybrid protocol (HP) which is a combination of power splitting relaying (PSR) and time switching relaying (TSR). The authors derive the analytical outage probability expressions of the HP over log‐normal fading channel. The numeri...

This paper studies the optimal power splitting strategy in a full-duplex wireless powered communication network (WPCN). This wireless powered network contains three nodes, which are the access point (AP), the relay node (R) and the user. We divide the communication process into two phases that each one has the same duration time. The AP transmits t...

This paper realizes a gesture-to-speech conversion system to solve the communication problem between healthy people and speech disorders. An improved speeded up robust features (SURF) algorithm is adopted for static gesture recognition by combining Kinect sensor. Meanwhile, a Hidden Markov Model (HMM) based Mandarin-Tibetan bilingual speech synthes...

This paper proposes a novel approach for speech enhancement based on compressed sensing (CS) theory. Each frame of noisy speech signal is sparsified firstly by using discrete cosine transform (DCT). Then we divide each frame into the noisy sub-frame and the clear sub-frame with a soft thresholding method to obtain the threholded DCT coefficients of...

Happiness has attracted much attention of the researchers in various fields. This paper realizes prosodic conversion of emotional speech for happiness computing on speech communication. An emotional speech corpus includes 11 kinds of typical emotional utterances is designed, where each utterance is labeled the emotional information with PAD value i...