Short-range Wireless Transmission Research Articles

Multiway Responder with Wireless Communication Technology

Responder as an electronic product have been widely used in intelligence and knowledge competitions occasions. This paper developed a multiway responder with wireless communication technology. Its components, function, working principle and interface with microcontroller programming were described in detail. It consists of six modules - competition answer module, answering signal receiver module, SCM system, enactment module, display module, voice prompt module. It uses wireless transceiver chips FSK-2A/CZS-3 for short-range wireless data transmission. It uses codec chips PT2262/PT2272 for data encryption and decryption. It uses AT89S52 microcontroller as the core controller. Simulation by protues software well achieved the expected results. The designed responder is not only simple and easy to implement, but also practical and cheap.

High Speed Transmission for a Coaxial Cable based In-Home Network

The in-home network is a crucial system for ubiquitous multimedia environments, in order to provide economical and effective high data rate transmission, we propose a transmission scheme based on the multi-carrier technique. We employ a coaxial cable channel as the transmission medium deployed for cable television (CATV). Through experiments, we show that it is possible to transmit a signal centered at 1.2 GHz with 528 MHz bandwidth without giving severe interference to the CATV system. With this observation, we propose an orthogonal frequency division multiplexing (OFDM)-based transmission scheme motivated by successful implementation of multiband OFDM (MB-OFDM) as the short range wireless transmission medium. The proposed OFDM-based system with several elementary techniques specialized in the coaxial cable for home network (CoHoNet) can achieve robust transmission over several experimental channel realizations with low power consumption.