Patent ID: 8102955

Claim:
A method, comprising: receiving ultra wideband pulse pairs, wherein each pulse pair of said pulse pairs is assigned a unique number n associated with a user n and comprises a data pulse (DP n ) and a reference pulse (RP n ), wherein said DP n has a data pulse center frequency (DP n f n ) and wherein said RP n has a reference pulse center frequency (RP n f n ), wherein said RP n f n is different from said DP n f n by a frequency difference (Δf n ), wherein within each said pulse pair, said DP n and said RP n comprise a substantially identical pulse shape, and wherein said pulse shape of each said pulse pair is different from that of all other pulse pairs; and altering said RP n f n of each said RP n to produce an altered frequency reference pulse (AFRP n ) having a center frequency about equal to said DP n f n .