Conference Paper

On the transmit strategy for the interference MIMO relay channel in the low power regime

Emmy-Noether Res. Group on Wireless Networks, UIm Univ., Ulm, Germany
Conference: Source and Channel Coding (SCC), 2010 International ITG Conference on
Source: IEEE Xplore

ABSTRACT This paper studies the interference channel with two transmitters and two receivers in the presence of a MIMO relay in the low transmit power regime. A communication scheme combining block Markov encoding, beamforming, and Willems' backward decoding is used. With this scheme, we get an interference channel with channel gains dependent on the signal power. A power allocation for this scheme is proposed, and the achievable rate region with this power allocation is given. We show that, at low transmit powers, with equal power constraints at the relay and the transmitters, the interference channel with a MIMO relay achieves a sum rate that is linear in the power. This sum rate is determined by the channel setup. We also show that in the presence of abundant power at the relay, the transmit strategy is significantly simplified, and the MAC from the transmitters to the relay forms the bottle neck of the system from the sum rate point of view.

0 Followers
 · 
70 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The two user Gaussian interference channel with a full-duplex relay is studied. By using genie aided approaches, two new upper bounds on the achievable sum-rate in this setup are derived. These upper bounds are shown to be tighter than previously known bounds under some conditions. Moreover, a transmit strategy for this setup is proposed. This strategy utilizes the following elements: Block Markov encoding combined with a Han-Kobayashi scheme at the sources, decode and forward at the relay, and Willems' backward decoding at the receivers. This scheme is shown to achieve within a finite gap our upper bounds in certain cases. Comment: 5 pages, 5 figures, to appear in proceedings of Asilomar Conference on Signals, Systems, and Computers 2010
    Circuits, Systems and Computers, 1977. Conference Record. 1977 11th Asilomar Conference on 08/2010; DOI:10.1109/ACSSC.2010.5757514
  • [Show abstract] [Hide abstract]
    ABSTRACT: We consider the interference channel with two transmit-receive pairs when there is a delay in receiving the desired message compared to interference. We study this channel in the weak interference regime (noisy interference), and show that delay does not affect the capacity of the interference channel in this region. This also holds for an interference channel with a more general delay, where receiving the desired message is delayed compared to the interference, or vice versa. This result is then applied to a previous results on the interference MIMO relay channel where a scheme is used to transform it to an interference channel with delay. We show that using a relay can be helpful when interference is treated as noise in the interference relay channel.

Full-text (2 Sources)

Download
18 Downloads
Available from
May 26, 2014