Abstract

Receive spatial modulation (RSM) schemes are promising for massive multiple-input-multiple-output (MIMO) systems at millimeter wave (mmWave) bands because they require reduced complexity and low consumption hardware at the user terminal and exploit the receive spatial dimension to attain high spectral efficiency. To the best of our knowledge, these schemes have been developed for narrowband transmission. In this paper, we adapt RSM schemes for outdoor wideband mmWave massive MIMO systems. We consider the downlink of a single user system operating with single carrier RSM and design a low complexity time-domain finite impulse response pre-equalizer to combat the intersymbol interference caused by the wideband transmission, assuming imperfect channel knowledge. We show that receive antenna selection (RAS) is necessary for attaining high spectral efficiency and we suggest fast and efficient RAS algorithm. Simulation results show that the proposed RSM scheme achieves comparable spectral efficiency to the fully digital orthogonal frequency division multiplexing MIMO system with superior energy efficiency.

Highlights

  • The vast spectrum available in the millimeter wave frequency band permits leveraging of the wide bandwidths to attain high data rates for the 5G systems [1]-[2]

  • An Receive spatial modulation (RSM) scheme based on a single RF chain and one high resolution ADC is reported in [7] that attains high data rates at outdoor narrowband massive MIMO systems

  • We propose a wideband single carrier RSM scheme based on a time-domain finite impulse response (FIR) pre-equalizer [8] and receive antenna selection (RAS)

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Summary

INTRODUCTION

The vast spectrum available in the millimeter wave (mmWave) frequency band permits leveraging of the wide bandwidths to attain high data rates for the 5G systems [1]-[2]. An RSM scheme based on a single RF chain and one high resolution ADC is reported in [7] that attains high data rates at outdoor narrowband massive MIMO systems. We adapt the energy efficient RSM scheme in [7] for outdoor wideband mmWave massive MIMO systems. We propose a wideband single carrier RSM scheme based on a time-domain finite impulse response (FIR) pre-equalizer [8] and receive antenna selection (RAS). We propose a wideband single carrier RSM scheme based on a low complexity zero forcing (ZF) time-domain FIR pre-equalizer with optimized delay for the UT narrowband architecture in [7] and no channel state information (CSI) at the UT and imperfect CSI at the BS.

SYSTEM AND CHANNEL MODELS
System assumptions
Frequency selective channel model
Low complexity FIR pre-equalization at the BS
TIME DOMAIN ZF PRE-EQUALIZATION
Analysis of number of pre-equalizer taps
Spatial symbol detection
DETECTION
Modulation symbol detection
ACHIEVABLE RATES AND RAS
Spatial symbol achievable rate
Modulation symbol achievable rate
FULLY DIGITAL OFDM MIMO
SIMULATION RESULTS
VIII. CONCLUSION
Full Text
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