Rethinking Wireless Interference: Interference-Free Multiple Access for Wideband MIMO Communication Systems
Abstract
In this research proposal, we consider a K-user multiple-input-multiple-output (MIMO) interference channel with inter-symbol interference (ISI), in which the channel coefficients are assumed to be linear time-invariant with finite-length impulse response. The capacity of this channel is fundamentally determined by three dominant interference effects: Inter-user-interference (IUI), inter-stream interference (ISTI), and ISI. To achieve the highest sum spectral efficiency of this channel, it has been known that transmitters cooperation is indispensable, which allows successfully eliminating all the IUI, ISTI, and ISI. In practice, however, it is extremely difficult to implement the state-of-art transmitterscooperation strategies due to huge signaling overheads associated with them; thereby, the performance gains that can obtain from transmitters cooperation have shown to be marginal against a simple no transmitters cooperation strategy in many practical wireless systems. The primary goal of the proposedresearch is to devise a novel communication strategy that does not require any transmitters cooperation while achieving the sum-spectral efficiency that scales linearly with the number of transmit receive pairs (K) and the number of antennas at each node (M). A novel concept of discrete Fourier transform (DFT)-based channel decomposition approach will be exploited to creates multiple parallelGaussian channels, each experiencing interference-free narrowband flat fading. This remarkable result is expected to open a new research area for the design of new multiple access systems in the next-generation (beyond 5G or 6G) networks, such as future internet-of-things (IoT) and cellular systems that are likely to be densely deployed for supporting Gigbit wireless connectivity.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 31, 2020
- Source ID
- N629092012056
Entities
People
- Wonjae Shin
Organizations
- Office of Naval Research
- United States Navy