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We propose an energy-efficient method to enable the data collection of wireless sensor networks (WSNs) assisted by a cellular network. They use the same radio resources in an underlay manner resulting in bandwidth efficiency improvements. During the sensor data collection (SDC) period, the cellular user functions as a mobile sink node while keeping the normal cellular traffic, and multicarrier code-division...
We present a new transmit strategy based on modified Alamouti codes for the simple two branch transmit diversity scheme. The OFDM payload cells from the output of the frequency interleaver is done on one transmit antenna, and the encoding is proceeded on another branch. The proposed encoding scheme can significantly simplify the processes of transforming SISO into MIMO in wireless communication systems...
As most of current researches on mobile services are focused on population living in urban areas, there is a lack of studies on users in rural areas. Unlike the fast and widespread adoption of mobile services in urban areas in China, adoption in rural areas is relatively slow. Compared to urban users, rural population's perception and use habits on mobile services have different features. This paper...
As both a new mobile service and a new education method, mobile learning is forming a new industry in China. Nevertheless, many researchers stated that the technological restrictions, like small screen size and inconvenient input, are the main challenges impeding the mobile learning adoption. Based on the data from a survey, this study focused on the research question that whether technological restriction...
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