Abstract
As a non-coherent transmission scheme that does not require channel state information at both transmitters and receivers, unitary space-time modulation is a promising technique that can be applied in high mobility scenario where the fading coefficients are changing too fast to be tracked and estimated. This article proposes a multi-cell cooperative transmission scheme based on unitary space-time modulation. Each cooperative base-station transmits an individual unitary signal from the common constellation set to the mobile unit which is located at the cell edge and suffers from severe inter-cell interference. Compared with traditional unitary space-time modulation, cooperation among multi-cells not only eliminates the inter-cell co-channel interference but also increases the transmission rate by expanding the constellation size. Performance of error probability is analyzed for the proposed scenario with maximum-likelihood decoding, in which the exact pairwise error probability is derived. Additionally, constellation optimization for cooperative transmission is also discussed to achieve the balance between transmission efficiency and reliability. Simulation results are provided to confirm the effectiveness of the proposed scheme in both block-fading channels and fast-fading channels.
Highlights
At present, the development of high-speed railway has put forward higher requirements for the wireless communication systems
Increasing commercial demand for broadband wireless communication to provide information and onboard entertainment services in the high-speed vehicles indicates that the network architecture, hardware devices and software algorithms should adapt to such super high-speed
Channel estimation becomes unrealistic in such time-variant channels, resulting the many of the current coherent reception techniques degrade in performance or even fail to work [2,3,4]
Summary
The development of high-speed railway has put forward higher requirements for the wireless communication systems. To avoid CSI exchange, this article proposes a multi-cell cooperative scenario by employing unitary space-time modulation, in which intercell CCI is eliminated in the fast-fading channel without CSI exchanging and data rate is increased since all the cooperative BSs are transmitting individual data bits simultaneously. Based on the PEP results, cooperative constellation optimization is considered to achieve the balance between the transmission rate and error performance.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: EURASIP Journal on Wireless Communications and Networking
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
