Mi-Hyun Son

Low power UWB RF transceiver for wireless headset

In this paper, the UWB RF transceiver architecture based on a direct chaotic communication system is introduced for wireless headset applications. The direct chaotic communication technology can realize excellent low data rate UWB communication. The low power RF transceiver with chaotic UWB signal of 3 GHz /spl sim/ 5 GHz is implemented for MP3 audio transmission. This simply configured system prototype performs non-coherent detection without up/down mixers. The system is expected E/sub b//N/sub 0/ of 18 dB for PER /spl les/ 10/sup -2/ at 32 bytes length of PSDU, and power consumption of 20 mW in case of 0.13 micron CMOS RFIC fabrication.

Low-Rate Chaotic UWB Transceiver System Based on IEEE 802.15.4a

The chaotic UWB communication system based on IEEE 802.15.4a is proposed for wireless headset applications. A compact architecture can be implemented by using a chaotic UWB signal and a non-coherent detection scheme. The chaotic UWB generator is designed with the BW of 3.1 to 5.1 GHz, and a baseband process is realized on an FPGA including an adaptive decision and a channel code for non-source coded data stream. The system performance is evaluated by transmitting MP3 audio/voice and measuring PERs at 32 byte length of a PSDU for the system sensitivity and the interferer compatibility. The proposed system can be an excellent candidate for short-range connectivity services, as well as an inexpensive system with good capability for narrow-band interferences

Low-cost realization of ISM Band Pass Filters using integrated combline structures

The low-cost realization of ISM Band Pass Filters using integrated combline structures has demonstrated. For the low-cost realization and mass-production, efforts have been concentrated into realizing the combline filter structures as an integrated conductor layer of FR5/Epoxy based multi-layer substrates which are widely utilized as multilayer printed circuit boards (PCB) instead of ceramic. This filter is useful for the wireless network devices of ISM band (2.4 GHz) as Bluetooth and Wireless LAN.

Chaotic UWB Communication System for Low-Rate Wireless Connectivity Applications

A chaotic UWB communication system based on IEEE 802.15.4a is proposed for wireless connectivity applications. A compact and simple architecture is implemented by using a chaotic UWB signal and a non-coherent detection scheme. The chaotic UWB signal has noise-like characteristics in time and frequency domains and naturally wide spectrum within a limited bandwidth. The chaotic UWB signal generator is designed on two methods with the bandwidth of 3.1 to 5.1 GHz, and a baseband process is realized on an FPGA including an adaptive decision and a channel code for non-source coded data stream. The system performance is evaluated by transmitting MP3 audio/voice with 32-byte length PSDUs and measuring PERs for assessing the system sensitivity and the interferer compatibility. The proposed system can be an excellent candidate for short-range connectivity services, as well as an inexpensive system with good capability for narrow-band interferences.

ISM band pass filters for low-cost realization of mobile communication apparatus

The low-cost realization of ISM Band Pass Filters (BPFs) using integrated combline structures has been demonstrated. For the low-cost realization and mass-production, efforts have been concentrated into realizing the combline filter structures as an integrated conductor layer of FR4/epoxy based multi-layer substrates which are widely utilized as multilayer printed circuit boards (PCB) instead of ceramic. This filter is useful for the wireless network devices of ISM band (2.4 GHz) as Bluetooth and wireless LAN.