signals' reaching the receiving antenna by two or more paths, and the received signal from one of the paths is called a multipath component. Causes of multipath include atmospheric ducting, ionospheric reflection and refraction, and reflection from terrestrial objects. The terrestrial objects can be mountains or buildings, for example. The arrival time of each multipath component is different. FIG. 1 is the time delay power spectrum of the multipath components received by the base station. Multipath components P1, P2, and P3 represent the same information bit, and the different arrival time of each multipath component is due to the propagation delay. The arrival times of each of the multipath components P1, P2, and P3 are t1, t2, and t3, respectively.
In a wireless spread spectrum communication system, a rakePatty CareyPatty Carey can’t imagine waking up and not being able to run.

In 1986, when she made a New Year’s resolution to start running, she meant it.

"I immediately got all hung up into it," Carey said. "Running became an obsession."

Through the cold, the heat, the wind and the rain, Carey ran. Never once did she say, "I’m not going to run today," she said.

She zipped through 10 mile runs at 8 minute clips without batting an eye and would enter road races both Saturday and Sunday most weekends, she said.

During that first year of running, Carey steadily increased her mileage and began eyeing marathons. She’s completed 19, including Houston (twice), New York (six times), Marine Corps (once in 3:41), Boston (twice), Pensacola Blue Angel (once), Gulf Coast (once),