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Phase Shift Adjustable Pilots for Channel Acquisition in Vehicle-to-Vehicle Underlay Wideband Massive MIMO
- Source :
- IEEE Access, Vol 8, Pp 203793-203803 (2020)
- Publication Year :
- 2020
- Publisher :
- IEEE, 2020.
-
Abstract
- Decrease of the pilot overhead is an important issue in vehicle-to-vehicle (V2V) underlay wideband massive multiple-input multiple-output (mMIMO) communication. To reduce the pilot overhead for channel acquisition, we propose phase shift adjustable pilots (PSAPs) for V2V underlay wideband mMIMO systems employing orthogonal frequency division multiplexing (OFDM). Motivated by the sparse property of the angle-delay (AD) domain channels in mMIMO, we first investigate channel acquisition for V2V underlay mMIMO-OFDM with PSAPs, and derive the optimal conditions to achieve the sum mean square error (sMSE) minimums of channel estimation and channel prediction, respectively. The optimal conditions indicate that the minimum sMSE can be achieved when the AD domain channel power spectra of cellular users (CUs) and transmitters in V2V communication pairs are non-overlapping after appropriate allocation of the available pilot phase shifts. Then an AD domain channel power spectrum based pilot allocation (ADCPS-PA)algorithm is developed according to the optimal conditions. Simulation results indicate that the achievable spectral efficiency for both cellular and V2V links can be significantly improved with PSAPs compared with that obtained by the conventional phase shift orthogonal pilot approach.
- Subjects :
- phase shift adjustable pilots
General Computer Science
Orthogonal frequency-division multiplexing
Computer science
MIMO
General Engineering
020206 networking & telecommunications
020302 automobile design & engineering
02 engineering and technology
Spectral efficiency
Domain (software engineering)
TK1-9971
0203 mechanical engineering
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
pilot phase shift allocation
Overhead (computing)
Channel acquisition
General Materials Science
Electrical engineering. Electronics. Nuclear engineering
Underlay
Wideband
V2V underlay
Communication channel
wideband massive MIMO
Subjects
Details
- Language :
- English
- ISSN :
- 21693536
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- IEEE Access
- Accession number :
- edsair.doi.dedup.....93f958fd54d961588b775000d746ff78