Power amplifier (PA) efficiency for high peak-to-average ratio signals like OFDM (Orthogonal Frequency Division Multiplexing) is a critical concern, but conventional envelope tracking (ET) often suffers from modem dependency. This paper presents starET, a novel modem-independent ET architecture for signals up to 20 MHz. starET autonomously extracts the RF envelope and internally manages key processing, including envelope shaping, negative group delay (NGD) filtering, and all-digital delay-locked loop (AD-DLL) timing calibration. Implemented in 0.18 µm CMOS as a two-chip solution (starET controller and ET modulator) to mitigate noise coupling, the system demonstrates successful modem-independent operation. Measurements show an overall starET system (controller + ET modulator) efficiency of 72% for a 10 MHz OFDM signal at 1.85 GHz, with a timing mismatch below 1 ns, validating its potential for efficient power supply modulation in contemporary wireless applications.

Human body communication (HBC) is a new technology for mobile and wearable devices operating over body area networks. In HBC, the body is used as a medium for transmitting data between devices to replace wired and wireless technologies. This study examines the bit error rate (BER) degradation experienced by HBC systems under the presence of co‐channel interference. A degradation model is proposed to estimate the change in BER, and a selective simulation method is proposed to obtain the BER performance with a small exceedance probability and a small number of BER samples.

Human body communications (HBC), which have been standardized in IEEE 802.15.6 standard for wireless body area networks (WBAN), provides a maximum data rate of 1.3125 Mbps through frequency selective digital transmission (FSDT). This paper reviews FSDT and proposes a modified FSDT (MFSDT). By exploiting the efficient modification of the FSDT's transmitter structure, MFSDT achieves a maximum data rate of 3.9375 Mbps, and the decoding complexity of MFSDT increases linearly with an increase in the data rate. In addition, FSDT and MFSDT performance are investigated with respect to the effects of the transmit filter provided to meet transmit spectral mask requirements, and a human body channel modeled as a finite impulse response filter.

An intuitive context aware service between two devices is possible using touch with the intrabody communication. Using this technology, users with multimedia devices may simply touch them to establish network connection, transfer data, and provide the required service; hence the name Touch-And-Play (TAP). Using TAP, users can disclose their context by touching the specific device. For instance, a user carrying a digital camera touches the TV to begin a slide show or a printer to print a photo. TAP is expected to enable the provision of intuitive, context-aware service. This paper discusses the feasibility of TAP and its application in user interface.

This paper presents a novel intrabody communication system, in which the base-band signal is directly transmitted through human body and electrically recovered, and its architecture are. The electrical characteristics of the human body in terms of a communicational channel are investigated from 1KHz to 10MHz using the equipment with a floating ground. The signal from universal asynchronous receiver transceiver (UART) port of microcontroller with 3V peak is used as the output of transmitter. The receiver board occupied 2.2 times 2.2cm2areas and consumes 30mW power with 3V supply voltage. The packet error rate (PER) of 10-8is obtained with a packet size of 77bits. The proposed system named Touch-And-Play (TAP) is implemented and validated by transferring the JPEG file with Manchester coded digital signal up to 1Mbps from one hand with a microcontroller to the opposite one with the functional equivalence of the printer through human body by touching them

An intuitive context aware service between two devices is possible using touch with the direct digital intra-body communication. Using this technology, users with multimedia devices may simply touch them to establish network connection, transfer data, and provide the required service; hence the name touch-and-play (TAP). Using TAP, users can disclose their context by touching the specific device. For instance, a user carrying a digital camera touches the TV to begin a slide show or a printer to print a photo. TAP is expected to enable the provision of intuitive, context-aware service. This paper discusses the communication protocol of TAP and its application