Patent ID: 8213376
Filing Date: 2012-07-03
Classification: H04W

Abstract:
1. An OFDMA power allocation method for managing power in a wireless communication system having a base station and a plurality of wireless users, the system implementing scalable orthogonal frequency division multiple access with quality of service proportional rate constraints, the method comprising the steps of: distributing N sub-channels among K users of the wireless communications system; receiving wireless requests at the base station for access to the wireless communications from the users; assessing power gain relative to noise for each sub-channel allocated to each user; iteratively computing sub-channel power allocations for each user based on the proportional rate constraints and the channel power gain information, thereby strictly satisfying the proportional rate constraints; and transmitting the power allocations to each of the users requesting access; wherein, said step of iteratively computing the sub-channel power allocations for each user comprises the steps of: inputting N number of sub-channels, K number of users, and channel power gains H inputting rate constraints γ inputting total power P inputting Ω calculating V calculating the W determining whether the sum of the calculated V otherwise, if the sum of the calculated V selecting a user index such that a corresponding is greater than or equal to for all k≠i and k=1, 2, . . . , K; assigning the value 1 to an X determining whether the equation changes sign and recalculating the Ω k , V k , W k and P total if the sign has not changed, otherwise solving for X i ; computing all X computing P and computing p