Abstract: Techniques pertaining to optimization of distributed-tone resource unit (RU) pilot tone designs in wireless communications are described. An apparatus (e.g., station (STA)) generates a distributed-tone RU (dRU) with a respective position of each of one or more pilot tones shifted with a respective position of each of one or more other pilot tones kept unchanged. The apparatus then performs a wireless communication in a 20 MHz or 40 MHz bandwidth with the dRU.

Abstract: A non-engine powered air conditioning system includes a solar energy supply arrangement having a solar energy collector adapted for mounting to the auto-vehicle and a power storage electrically connecting to the solar energy collector for converting the solar energy into electrical energy, and an electrical compressor electrically connecting to the power storage, wherein the electrical compressor is adapted for generating a cooling air to an interior of the auto-vehicle. The non-engine powered air conditioning system allows the driver to pre-cool the auto-vehicle before driving when the auto-vehicle is exposed under intensive sunlight for a period of time to avoid the driver experiencing extremely high interior temperature in the vehicle. Therefore, the drive is able to operate the vehicle with his best physical condition. Adopting the air conditioning system is adapted to also avoid some environmental problems, such as air pollution and global warming effect.