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A New Approach of Interference Alignment through Asymmetric Complex Signaling and Multiuser Diversity

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4 Author(s)
Hun-Young Shin ; Sch. of Electr. Eng., Korea Univ., Seoul, South Korea ; Seok-Hwan Park ; Haewook Park ; Inkyu Lee

In this letter, we consider a new interference alignment (IA) strategy for single-input single-output interference broadcast channels with constant channel coefficients. First, we show that 1.5 degrees of freedom (DOF) is achievable for 3-cell case by utilizing asymmetric complex signaling (AC) and multiuser diversity without symbol extension. It is also investigated that the achievable DOF varies with the user scaling condition and ω(√(SNR)) is required for guaranteeing the DOF of 1.5. To improve the sum-rate performance, user scheduling algorithms combined with the beamforming techniques are suggested which outperform the conventional IA schemes. After introducing an exhaustive scheduling algorithm which shows optimal sum-rate, a simplified scheduling method is also proposed which reduces both scheduling metric computations and the search size.

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Wireless Communications, IEEE Transactions on  (Volume:11 ,  Issue: 3 )