A Real-Complex Hybrid Modulation Approach for Scaling Up Multiuser MIMO Detection

In this paper, a novel approach, namely, real-complex hybrid modulation (RCHM), is proposed to scale up multiuser multiple-input multiple-output (MU-MIMO) detection with particular concern on the use of equal or approximately equal service antennas and user terminals (UTs). By RCHM, we mean that UTs...

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Bibliographic Details
Published in:IEEE transactions on communications 2018-09, Vol.66 (9), p.3916-3929
Main Authors: De Luna Ducoing, Juan Carlos, Ma, Yi, Yi, Na, Tafazolli, Rahim
Format: Article
Language:English
Subjects:
Computer simulation
Computer terminals
detection
Error analysis
Fading channels
Mathematical analysis
MIMO communication
Modulation
Multiplexing
Multiuser multiple-input multiple-output (MU-MIMO)
Power management
Power system reliability
Probability
real-complex hybrid modulation (RCHM)
Receivers
Scaling up
Sequences
Signal processing algorithms
successive interference cancellation (SIC)
widely-linear receiver
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Summary:In this paper, a novel approach, namely, real-complex hybrid modulation (RCHM), is proposed to scale up multiuser multiple-input multiple-output (MU-MIMO) detection with particular concern on the use of equal or approximately equal service antennas and user terminals (UTs). By RCHM, we mean that UTs transmit their data sequences with a mix of real and complex modulation symbols interleaved in the spatial and temporal domain. It is shown that, through the system outage probability, RCHM can combine the merits of real and complex modulations to achieve the best spatial diversity-multiplexing tradeoff that minimizes the required transmit-power given a sum rate. The signal pattern of RCHM is optimized with respect to the real-to-complex symbol ratio as well as power allocation. It is also shown that RCHM equips the successive interference canceling MU-MIMO receiver with near-optimal performances and fast convergence in Rayleigh fading channels. This result is validated through our mathematical analysis of the average bit-error-rate as well as extensive computer simulations considering the case with single or multiple base stations.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2018.2833101