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Superimposed Pilots : An Alternative Pilot Structure to Mitigate Pilot Contamination in Massive MIMO
- Citation Author(s):
- Submitted by:
- Karthik Upadhya
- Last updated:
- 15 March 2016 - 10:18am
- Document Type:
- Presentation Slides
- Document Year:
- 2016
- Event:
- Presenters:
- Karthik Upadhya
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Superimposed pilots are proposed as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple-output systems. Provided that the uplink duration is larger than the total number of users in the system, superimposed pilots enable each user to be assigned a unique pilot sequence, thereby allowing for a significant reduction in pilot contamination. Channel estimation performance in the uplink is further improved using an iterative data-aided algorithm. Based on approximate expressions for the uplink signal-to-interference-plus-noise ratio, it is shown that superimposed pilots provide a better performance when compared with methods that use time-multiplexed data and pilots. Numerical simulations are used to validate the approximations and the improved performance of the proposed method.