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Sökning: LAR1:cth > Viberg Mats 1961 > Engelska > Coldrey Mikael 1972 > (2010)

  • Resultat 1-3 av 3
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  • Lioliou, Panagiota, 1982-, et al. (författare)
  • Self-Interference Suppression in Full-Duplex MIMO Relays
  • 2010
  • Ingår i: 44th Asilomar Conference on Signals, Systems and Computers. - 1058-6393. - 978-142449721-8 ; s. 658-662
  • Konferensbidrag (refereegranskat)abstract
    • Full-duplex relays can provide cost-effective cover-age extension and throughput enhancement. However, the main limiting factor is the resulting self-interference signal which deteriorates the relay performance. In this paper, we propose a novel technique for self-interference suppression in full-duplex Multiple-Input Multiple-Output (MIMO) relays. The relay employs transmit and receive weight filters for suppressing the self-interference signal. Unlike existing techniques that are based on zero forcing of self-interference, we aim at maximizing the ratio between the power of the useful signal to the self-interference power at the relay reception and transmission. Our simulation results show that the proposed algorithm outperforms the existing schemes since it can suppress interference substantially with less impact on the useful signal.
  • Seifi, Nima, 1981-, et al. (författare)
  • An Efficient Signaling for Multi-mode Transmission in Multi-user MIMO
  • 2010
  • Ingår i: IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'10), Dallas, USA, Mar. 2010.. - 1520-6149. - 978-142444296-6 ; s. 3402-3405
  • Konferensbidrag (refereegranskat)abstract
    • In this paper the downlink of a multi-user MIMO (MUMIMO) system with multi-mode transmission is considered. We propose a low-complexity algorithm for selecting users and the corresponding number of data streams to each user, denoted as user transmission mode (UTM). The selection is only based on the average received signal-to-noise ratio (SNR) from the base station (BS) for each user. This reduces the overall amount of feedback for scheduling, as opposed to techniques that assume perfect instantaneous channel state information (CSI) from all users. Analytical average throughput approximations are derived for each user at different UTMs. Simulation results demonstrate that the proposed algorithm provides performance close to dirty paper coding (DPC) with considerably reduced feedback.
  • Seifi, Nima, 1981-, et al. (författare)
  • Coordinated Single-Cell vs Multi-Cell Transmission with Limited-Capacity Backhaul
  • 2010
  • Ingår i: IEEE Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 2010. - 1058-6393. - 978-142449721-8 ; s. 1217-1221
  • Konferensbidrag (refereegranskat)abstract
    • Base station coordination is an efficient technique to transcend the limits on spectral efficiency imposed by intercell interference. In this paper, we compare the performance of different coordination strategies with different amount of channel state information (CSI) and data sharing among the coordinating base stations. We focus on the effect of limited backhaul capacity in a two-cell network. Contrary to the common belief, we show that coordination strategies with no data and only limited CSI sharing is preferred to those with full data and CSI sharing when the backhaul capacity is relatively low and the edge SNR is high.
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Seifi, Nima, 1981-, (2)
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