Abstract
Coordinated multi-point transmission and reception (CoMP) scheme enable LTE-Advanced systems to achieve their higher spectral efficiency. Allowing base stations to cooperate one another is one of the solutions to mitigate the inter-cell interference (ICI). In this paper, we propose an iterative power allocation scheme with MMSE procoding based on a modified water-filling for downlink CoMP systems, which achieves the optimal performance. The simulation results show that our proposed system can achieve its optimal rate according to its antenna configuration. Comparing them with a block diagonalization (BD) shows the advantages of MMSE precoding, in particular at a low SNR region.
Highlights
Coordinated multi-point transmission and reception (CoMP) scheme has been widely used for LTE-Advanced system to enhance cell average and cell edge throughput
We analyze the performance in terms of achievable rates for the proposed iterative waterfilling (MMSE PWF), modified waterfilling (MMSE PMWF) and the optimum solution found by exhaustive search (MMSE ES)
We can see that the optimum MMSE precoding found by ES outperforms block diagonalization (BD) WF for all the values of the number of transmit antennas Nt, and MMSE PMWF outperforms MMSE PWF
Summary
Coordinated multi-point transmission and reception (CoMP) scheme has been widely used for LTE-Advanced system to enhance cell average and cell edge throughput. In the JP strategy as shown, each user equipment (UE) simultaneously receives data from multiple base stations (BSs) with joint multi-user precoding, which is required to share both user data and channel state information (CSI) between base stations (BSs) and user equipments (UEs). Stemming from that, this JP strategy could be used to contribute to improving the strength of the receive signal and cancelling interference. Compared with JP, CS/CB can avoid inter-cell interference (ICI) by applying precoding to each BS on an individual basis, which is required to share only CSI without holding user data in common.
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