A method and apparatus are disclosed for improving drying of a module, tooling, and solder stencils via the introduction of acoustic pressure waves andor vibrational energy to the module, tooling, or solder stencils. The battery pack monitoring apparatus includes a bare cell adapted to be chargeddischarged with a predetermined voltage. The pass processor includes an s pass processor, an r pass processor and a c pass processor. In addition, synchronization for bit timing and frequency offset resulted from clocks between the transmitter and receiver are also performed with or without preamble as prior information. In some embodiments of the invention a pilot pattern is provided in which the pilot are sent using OFDM and data is sent using OFDM andor transformed OFDM. 0<Fno\u2014w\xd7Y{\xd7\u03b25\u2014w2}<\u22127.