A semiconductor and a method for forming the same are disclosed. The LCD device has a wider viewing angle and lower operating voltage. In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel partially filled with water or other liquid. The null data packet may include a cyclic redundancy check field configured to provide information based on which the null data packet or acknowledgements may be checked for errors. Users that do not have a resource assignment in a frame can skip the remainder of the frame, including the rest of the control message and data, and shutdown their receivers thus reducing power consumption.