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Meeting Report. Gill Aug. 24, 2010. Letter -- simulation. Sum rate. DIA-MMSE. DIA-MMSE: Since DIA is suboptimal, it should be operated for Tx first, then MMSE for Rx during each iteration. Letter -- simulation (cont.). 4 ×4 3 links. Letter -- simulation (cont.). 3 ×3 3 links.

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meeting report

Meeting Report

Gill

Aug. 24, 2010

letter simulation
Letter -- simulation

Sum rate

DIA-MMSE

  • DIA-MMSE: Since DIA is suboptimal, it should be operated for Tx first, then MMSE for Rx during each iteration.
letter simulation cont1
Letter -- simulation (cont.)

3×3 3 links

  • Which case to choose in the letter?
    • {3x3, 3} or/and {4x4, 3}?
letter larry s comments
Letter – Larry’s comments
  • Title: A new distributed interference alignment algorithm for multiuser MIMO networks.
    • Should “Max SNR” be added in the title? Compared with ML-DIA, this is the main improvement of MS-DIA.
  • One of old algorithms, named as Max-SINR or MMSE?
  • The classification in section III (algorithm description part): 3 or 4 subsections?
  • The contribution of the letter
    • Compared with ML-DIA, MS-DIA has better performance.
    • Compared with MMSE, MS-DIA has faster convergence.
system model
System model

MIMO-BC

Motivation

Larry: use different SNRs for each link, taking path loss and errors in the channel into account.

Doug: MIMO-BC and MIMO-MAC are realistic cases in 802.11ac.

Power constraints of the network.

system model cont
System model (cont.)
  • Downlink network (original network)
    • BS/AP with M antennas
    • K users with Nk antennas and one data stream each
    • DL channel:
    • SINR of the kth stream/user:
  • Uplink network (dual network)
    • SINR of the kth stream/user:
  • Problem to solve: beamformer and power optimization.
general algorithm bf pc
General algorithm – BF&PC
  • Step 1: consider downlink channel with fixed and given qk and Vk
    • Update vector pk by a certain power control method
    • Optimize vector Uk by beamforming method.
  • Step 2: consider uplink channel with fixed and given pk and Uk
    • Update qk by a power control method
    • Optimize vector Vk by beamforming method.
  • Step 3: test a stopping criterion
  • Beamforming method: IA, ZF, MMSE.
  • Power control method: waterfilling, binary power control, pricing algorithm, etc.
  • Convergence of iterative method: monotonic increase of SINR with a bound.
simulation
Simulation
  • Case 1: {4x4, 3}
    • AP with 4 Tx antennas
    • 3 users with 4 Rx antenna each
  • Case 2: {3x3, 2}
    • AP with 3 Tx antennas
    • 2 users with 3 Rx antenna each
  • Single SS per user in the MU-MIMO
  • Uniform power allocation
  • Results for 2000 channel realizations
  • Iterative algorithms
    • MMSE: done to beam-form the 1 SS of each user
    • MS-DIA
simulation discussion
Simulation & discussion

4×4 3 links

3×3 2 links

  • As optimal filter, MMSE is widely used for BF&PC in literature.
  • MS-DIA achieves the same performance as MMSE at high SNR. (Similar to MIMO X Channel)
  • The difference between MIMO-BC/MAC and MIMO X Channel?