{'fraction_non_alphanumeric': 0.02416918429003021, 'fraction_numerical': 0.0022658610271903325, 'mean_word_length': 5.527093596059113, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Ultra-Low Power Communication Logic Circuits for Distributed Sensor Networks

SmartDust, a concept recently proposed by Kris Pister [1], are millimeter scale sensing and communication platforms composing a distributed sensor network that can monitor environmental conditions in both military and commercial applications (figure 1). These networks consist of hundreds to thousands of dust motes and a few interrogating transceivers. Each mote consists of multiple sensors, a power supply (solar cell, button cell battery, or thin film battery), analog and digital circuits, and a communication transceiver. The motes are built from integrated circuit and micromachining processes for low cost, low power consumption, and small size. Communication between the motes and the receiver is accomplished via a wireless optical communication link at 1 kbps or less. Since these motes must operate for one or two days between charges, depending on the operating environment, power consumption of the circuits is a key issue. Traditional communication circuits can consume a large amount of energy. This paper will detail the optical communication channel, data link layer protocol, and communication system architecture and circuitry that lead to an ultra-low power communication link. II. OPTICAL COMMUNICATION (PHYSICAL LINK LAYER)