Abstract
We consider the problem of joint power allocation (JPA) in a coordinated multi-point (CoMP) joint diversity transmission (JDT) network with a total coordination point power (TCPP) constraint, aimed at maximizing the ergodic cooperative capacity (ECC) in Rayleigh fading channels. In this paper, we first extend the JPA problem in the coordinated two-point (Co2P) JDT networkto the case of a non-unity TCPP constraint. Furthermore, we introduce more accurate log-quadratic approximated (LQA) expressions to obtain the coordinated transmission point (CTP) powers. Next, we extend our study to a coordinated three-point (Co3P) JDT network. Given the mean branch gain-to-noise ratios, we first obtain a log-linear approximated (LLA) expression for obtaining the optimum power of the third CTP (i.e., the worst quality-providing CTP). After obtaining the third-CTP power, we obtain the CTP powers of two better quality-providing CTPs by invoking the LLA CTP power expressions for Co2P JDT power allocation, under the remaining power given by the TCPP minus the third-CTP power. The numerical results demonstrate that the LQA and LLA CTP power expressions for Co2P JDT and the LLA CTP power expressions for Co3P JDT are very efficient in terms of the simplicity for JPA and CoMP set selection, as well as the resulting ECC.
Highlights
In a cellular network, the cell-edge user throughput is mainly limited owing to the path loss by the long distance from the serving base station and the inter-cell interference from neighboring base stations
joint diversity transmission (JDT) and the log-linear approximated (LLA) coordinated transmission point (CTP) power expressions for Co3P JDT are very efficient in terms of the simplicity for joint power allocation (JPA) and Coordinated multi-point (CoMP) set selection, as well as the resulting ergodic cooperative capacity (ECC)
After obtaining the approximate third-CTP power, we obtain the CTP powers of the two better quality-providing CTPs (i.e., CTP1 and CTP2, with CTP1 denoting the best quality-providing CTP) by using the LLA CTP power expressions used for Co2P JDT power allocation, under the remaining power given by the total coordination point power (TCPP) minus the third-CTP power
Summary
The cell-edge user throughput is mainly limited owing to the path loss by the long distance from the serving base station and the inter-cell interference from neighboring base stations. In [11], an optimum joint power allocation (JPA) scheme to maximize the instantaneous capacity in an orthogonal frequency division multiple access CoMP JDT network with individual CTP power constraints was introduced. This scheme may be used only in a slowly varying fading environment because the instantaneous channel state information may not be exchanged quickly enough among the CTPs. In [8], the authors dealt with the problem of JPA in a coordinated two-point (Co2P) JDT network with a unity TCPP constraint, aimed at maximizing the ergodic cooperative capacity (ECC) in Rayleigh fading channels. We perform numerical analyses to demonstrate the ECC efficiencies when the LQA and LLA CTP power expressions for Co2P JDT and the LLA CTP power expressions for Co3P JDT are used
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