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Downlink Interference Alignment

Downlink Interference Alignment,10.1109/GLOCOM.2010.5684033,Changho Suh,Minnie Ho,David Tse

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Downlink Interference Alignment   (Citations: 17)
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We develop an interference alignment (IA) technique for a downlink cellular system. In the uplink, IA schemes need channel-state-information exchange across base-stations of different cells, but our downlink IA technique requires feedback only within a cell. As a result, the proposed scheme can be implemented with a few changes to an existing cellular system where the feedback mechanism (within a cell) is already being considered for supporting multi-user MIMO. Not only is our proposed scheme implementable with little effort, it can in fact provide substantial gain especially when interference from a dominant interferer is significantly stronger than the remaining interference: it is shown that in the two-isolated cell layout, our scheme provides four-fold gain in throughput performance over a standard multi-user MIMO technique. We show through simulations that our technique provides respectable gain under a more realistic scenario: it gives approximately 20% gain for a 19 hexagonal wrap-around-cell layout. Furthermore, we show that our scheme has the potential to provide substantial gain for macro-pico cellular networks where pico-users can be significantly interfered with by the nearby macro-BS.
Conference: Global Telecommunications Conference, . GLOBECOM . IEEE - GLOBECOM , vol. abs/1003.3, pp. 1-5, 2010
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    • ...Section IV examines the application of Downlink Interference Alignment (IA) [19] to the two-tier femtocell system, and Section V considers the use of multi-antenna femtocell APs...
    • ...In this section we borrow and modify the scheme proposed in [19], known as Downlink IA, for our two-tier macro/femto system...

    Ansuman Adhikary, et al. Cognitive femtocells: Breaking the spatial reuse barrier of cellular s...

    • ...Related work on IA for cellular systems is presented in [4, 5, 6]. ZF conditions for two cells are presented in [4], and are extended to an arbitrary number of cells for a certain class of “decomposable” channels (which does not include those with i.i.d...
    • ...Related work on IA for cellular systems is presented in [4, 5, 6]. ZF conditions for two cells are presented in [4], and are extended to an arbitrary number of cells for a certain class of “decomposable” channels (which does not include those with i.i.d...
    • ...We note that the IA algorithm presented in [4] assumes (K +1 )× (K +1 )channels, whereas the algorithm presented in the next section is observed to work with (K +1 )× K channels...
    • ...Motivated by the IA scheme presented in [4], to eliminate both the inter- and intra-cell interference we apply the precoding matrix 4...
    • ...Note also that the ap- proach in [4] applies only to two cells...

    Binnan Zhuang, et al. Interference alignment in MIMO cellular networks

    • ...In [9] and [10], a precoding scheme called the subspace interference alignment (IA) for the MIMO-IFBC was introduced by appropriately exploiting the concept of the original IA in [5]-[7]...
    • ...feasible schemes introduced by [4] and [10] can achieve DoF 4 using 4 and 3 receive antennas at each user, respectively...
    • ...CZF [4] (3,2,2) 3 Subspace IA [10] (3,3,2) 4...
    • ...The reason for the increase of degrees of freedom comes from that the interference alignment can utilize the signal space efficiently rather than the coordinated ZF scheme do. In addition, we also emphasize that the proposed scheme has the benefit in terms of the total number of antennas compared with the subspace IA scheme in [10]...

    Wonjae Shin, et al. On the Design of Interference Alignment Scheme for Two-Cell MIMO Inter...

    • ...The method of interference alignment has been also investigated in cellular networks [1], [3] in which downlink and uplink channels are modeled as interference broadcast channel (IBC) and interference multiple access channel (IMAC) respectively...

    Mohsen Rezaee Kheirabadi, et al. Uplink interference alignment for OFDM systems

    • ...Full degrees of freedom in the Gaussian MIMO interference channel are achieved with interference alignment [1], [2], also effective in reducing inter-cell interference in the downlink cellular system [3]...

    Ivana Marie, et al. Resource allocation for constrained backhaul in picocell networks

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