Abstract: In wireless devices for transmitting/receiving at least one of broadcasting, communication and controlling, a wireless network protocol transmits repeatedly data structure with a certain period in a unit of the same cycle, and maintains synchronization of the devices in a unit of the same cycle. As a result, a frequency hopping is performed in a unit of a cycle. Here, length of the cycle is set to below 20 msec so that a buffer used for transmitting/receiving a broadcasting signal and a voice/data communication has length of below 20 msec. Cycles form a network cycle. Control frames included in the cycles in the network cycle are differently assigned in accordance with their use, and so the control frames may be used for various controls. A payload frame in the cycle used by a user may be set freely in the range of length of the cycle.

Abstract: Disclosed is a method for modulating data for a polarity alternated pulse width code division multiple access (PAPW/CDMA) system and a method for measuring a distance between communicating equipments using the PAPW/CDMA. The method for modulating data includes the steps of multiplying CDMA signals inputted from multiple channels by a selected mask pattern, selecting the mask pattern among predetermined mask patterns that have the least peak value, truncation of multiplied CDMA signals according to a predetermined magnitude of levels to form level-number-reduced signals, converting the level-number-reduced signals to pulse width to generate modulated signals having a constant level, and alternately switching a starting polarity of pulses of the modulated signals between “high” and “low”.