# DYNAMIC POWER ALLOCATION SCHEME USING LOAD MATRIX TO CONTROL INTERFERENCE IN 4G MOBILE COMMUNICATION SYSTEMS

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4 (10) The necessary transmitted power for user n at rate q is, (12) In equation (12), the SNIR used in single carrier systems is bifurcated in terms of SNR and SIR (11) If above all conditions are satisfied then only power is acceptable and user n will be scheduled for transmission. After that LM elements are updated and is calculated for each cell using equation (10).The performance of the LM scheduling has the optimum RoT over other algorithms because this scheduler considerably decreases the probability of the RoT getting over its target. The Load matrix approach considered in the previous section is able to allocate the power efficiently for a single cell users based on SNIR and RoT concepts, considering only signal to noise ratio for power allocation for single carrier communication. IV. LM BFSNIR APPROACH In Multi-carrier communication system the Signal to interference ratio is affected distinctly in each carrier hence a single SNIR for allocation is not optimal. Also, since due to usage of orthogonally modulated signals for transmission over narrow band channels the interference between them is decreased. Hence SIR which is distinct in each channels is almost maximized,for the optimization of power allocation the total SIR in Multi carrier system is sum of SIR s in individual channels which greater than the SNIR obtained in single carrier system. This can be mathematically expressed as Where denotes the background signal-to-noise ratio. SIR is the signal-tointerference ratio evaluated for in every narrow channel by doing so the (12) can be rewritten as shown (13) Where BFSNIR is called as bifurcated SNIR evaluated for multi-carrier system designed with four transmit and receive antennas(i.e. =4), substituting the above equation (13) for the conventional LM approach, the proposed get modified as (14) The required transmitted power for user i at rate p is then defined as, (15) The allocable power to each user with rate q is then defined as; ISSN All Rights Reserved 2014 IJEETE Page 25

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