Disclosed is a method and apparatus for transmittingreceiving control information in a system in which one or more Radio Frequencies are used to carry multiple services through a frame constituted by time resources or time-frequency resources. Each Subscriber Unit includes a linear precoder which predistorts the contention word to compensate for the impulse response of the transmission channel between it and Access Point. The diffuser consists of two parts. When the bolts and nuts are tightened, the spinous processes are clamped between the plates, thereby pressing the bone growth promoting substance against the bone and encouraging bone growth across the vertebrae fixed by the plates. The actual switching times of the IO pins are spread out in time to decrease SSN in the IO pins. A method of forming a semiconductor device structure, and a semiconductor device structure are also described.