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This paper investigates the downlink throughput performance of the Grassmannian line packing (GLP)-based pilot sequence design for time-duplex-division (TDD) massive multiple-input-multiple-output (MIMO) systems. When the length of the uplink pilot sequence is less than the number of single-antenna user equipments (UEs), the GLP-based scheme may perform better than the pilot reuse scheme. With given number of UEs and pilot sequence length, the pilot design problem can be considered as the line packing problem in Grassmannian manifold. We propose a closed-form achievable rate expression for the multi-cell scenario and evaluate the throughput improvement of GLP, which is compared with the conventional pilot reuse scheme. Numerical results demonstrate the GLP-based pilot design can provide significant improvements in the system throughput over the pilot reuse scheme.
|Title of host publication||Workshop on Smart Antennas 2016|
|Publication status||Published - 9 Mar 2016|
|Event||Workshop on Smart Antennas 2016 - Munich, Germany|
Duration: 9 Mar 2016 → 11 Mar 2016
|Conference||Workshop on Smart Antennas 2016|
|Period||9/03/16 → 11/03/16|