Patent Document ID: 20070091983
Application ID: 11443040
Patent Flag: 0

Claim One:
1. A method for power efficient channel allocation in a multi-band multi-user ultra-wideband (UWB) system, including a plurality of K users, a plurality of S sub-bands, and a plurality of N sub-carriers, wherein each k th of said plurality of K users requests transmission with a data transmission rate R k , including the steps of: defining a sub-band assignment matrix A including a plurality of a ks elements, wherein k=1, 2,. .. , k, and s=1, 2,. .. , S, said a ks represents the duration of a data packet which the k th user is allowed to transmit on the s th sub-band; establishing a power allocation matrix P including a plurality of P k s elements, each P k s representing the transmit power of the k th user at each sub-carrier of the s th sub-band; calculating said sub-band assignment matrix A and said power allocation matrix P under pre-defined constraints to allocate the users' transmissions to respective sub-bands, thereby minimizing the overall transmit power in said UWB system; and, adapting said sub-band assignment matrix A and said power allocation matrix P to said respective sub-bands' conditions, if said allocation of the users' transmissions to said respective sub-bands deviates from a predetermined allocation criteria.