Name
Abstract | ||
|---|---|---|
Downlink Multi-User MIMO (MU-MIMO) enables the simultaneous spatial sharing of the channel by multiple users to achieve a capacity gain over Single-Input Single-Output (SISO) systems. Unfortunately, the overhead required to enable multi-user MIMO is much higher than the overhead required for single-stream systems. Namely, for K users, collection of channel state information requires K transmission exchanges (i.e., O(K)) between the AP and users. Likewise, the MU-MIMO acknowledgement process also requires the same amount of exchanges, thus reducing the performance gains attained via simultaneous downlink transmission. In this paper, we design, implement, and experimentally evaluate Concurrent Uplink Control Messages (CUiC) to scale the MU-MIMO control information exchange process and improve the efficiency of 802.11ac-based MU-MIMO networks. Our key technique is the design of new channel sounding and acknowledgement mechanisms that enable multiple users to transmit their reverse-direction control messages (i.e., beamforming reports and acknowledgments) concurrently to the AP, in O(1) transmission slots. We implement CUiC and perform an extensive set of experiments and demonstrate throughput gains of more than 100% compared to 802.11ac. |
Year | DOI | Venue |
|---|---|---|
2015 | 10.1109/SAHCN.2015.7338322 | 2015 12th Annual IEEE International Conference on Sensing, Communication, and Networking (SECON) |
Keywords | Field | DocType |
concurrent uplink control messages,downlink multiuser MIMO,MU-MIMO control information exchange process,spatial sharing,single-input single-output systems,SISO systems,channel state information,K transmission exchanges,simultaneous downlink transmission,CUiC,802.11ac-based MU-MIMO networks,channel sounding,reverse-direction control messages | Beamforming,Multi-user MIMO,Channel sounding,Computer science,MIMO,Communication channel,Computer network,Throughput,Distributed computing,Telecommunications link,Channel state information | Conference |
Citations | PageRank | References |
0 | 0.34 | 15 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Oscar Bejarano | 1 | 88 | 5.64 |
| Sadia Quadri | 2 | 0 | 0.34 |
| Omer Gurewitz | 3 | 991 | 51.58 |
| Edward W. Knightly | 4 | 4763 | 371.38 |