Graduate School and Research Center in Digital Sciences

A WiFi SIC receiver in the presence of LTE-LAA for indoor deployment

Kumar, Sumit; Kaltenberger, Florian; Ramirez, Alejandro; Kloiber, Bernhard

WCNC 2019, Wireless Communications and Networking Conference, 15-19 April 2019, Marrakech, Morocco

To fulfill the exponential growth of mobile traffic demands, 3GPP has standardized the use of LTE in the 5 GHz unlicensed band in the Release 13 dedicated to LTE Licensed-Assisted Access (LTE-LAA). Simulations and field trials have shown that incumbent WiFi (802.11ac) in the 5 GHz unlicensed band will be the victim in such co-channel deployment with LTE-LAA. Hence a concern is being raised about fair co-existence. In this work, we investigate the limits of Successive Interference Cancellation (SIC) to recover the WiFi packets corrupted by LTE-LAA in the event of a collision. For an indoor deployment, which is the most probable battleground for WiFi and LTE-LAA, we propose a method to perform SIC by using stored clean channel estimates of stronger signals obtained during an interference-free period. Our approach leverages the slow fading channel and hence high coherence time of the indoor channel. For an experimental proof of this phenomenon, we simulated a scenario with interference between 20 MHz 802.11ac and 20 MHz LTE-LAA at different interframe- intervals (IFI) of LTE-LAA frames. Our results show that for an LTE-LAA IFI up to 2 milliseconds, the proposed method of using stored channel estimates to perform SIC can achieve significant transmit power gain (TPG) compared to the conventional way of using instantaneous channel estimates. Our method complements the conventional approach to ensure improved WiFi Frame Detection and Decoding while applying SIC. Moreover, our method does not require any coordination between WiFi and LTE-LAA transceivers and hence can be deployed within existing infrastructure with minimal modifications.

Document Doi Bibtex

Title:A WiFi SIC receiver in the presence of LTE-LAA for indoor deployment
Department:Communication systems
Eurecom ref:5803
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Bibtex: @inproceedings{EURECOM+5803, doi = {}, year = {2019}, title = {{A} {W}i{F}i {SIC} receiver in the presence of {LTE}-{LAA} for indoor deployment}, author = {{K}umar, {S}umit and {K}altenberger, {F}lorian and {R}amirez, {A}lejandro and {K}loiber, {B}ernhard}, booktitle = {{WCNC} 2019, {W}ireless {C}ommunications and {N}etworking {C}onference, 15-19 {A}pril 2019, {M}arrakech, {M}orocco}, address = {{M}arrakech, {MOROCCO}}, month = {04}, url = {} }
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