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An Intercell Interference Reduction Technique for OFDM-based Cellular Systems Using Virtual Multiple Antenna  

Lee Kyu-In (Chung-Ang University)
Ko Hyun-Soo (Chung-Ang University)
Ahn Jae-Young (Electronics and Telecommunication Research Institute)
Cho Yong-Soo (Chung-Ang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.3, 2006 , pp. 32-38 More about this Journal
Abstract
In this paper, an intercell interference (ICI) reduction technique is proposed for OFDM-based cellular systems using the concept of virtual multiple antenna where multiple antenna techniques are performed on a set of subcarriers, not on the actual antenna array. The proposed technique is especially effective for user terminals with a single antenna at cell boundary in fully-loaded OFDM cellular systems with a frequency reuse factor equal to 1. Proposed ICI reduction techniques developed for SISO and MISO environments are shown to be robust to symbol timing offsets and efficient for various cell environments by adjusting group size depending on the number of adjacent cells. Also, the concept of a virtual signature randomizer (VSR) is introduced to improve channel separability in the virtual MIMO approach. It is shown by simulation that the proposed techniques are effective in reducing ICI and inter-sector interference compared with the conventional methods.
Keywords
OFDM; virtual MIMO; inter-cell interference; inter-sector interference; VSR;
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