GPU를 이용한 TDD LTE MU-MIMO 시스템에서의 재전송 구현
Implementation of Retransmission in TDD LTE MU-MIMO system using GPU
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참고문헌
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초록
The TDD LTE MU-MIMO HARQ system is designed and implemented using GPU based on 3GPP Rel.10 standard. The system consists of the DU part of the base station and the terminal using the general computer based on the GeForce GTX TITAN graphics card provided by NIVIDIA, and constructed the part of the RU using USRP N210 provided by Ettus. In the implementation part, SDR standard is applied, so that various communication standards can be compatible with software. The retransmission is implemented by combining the previous data with the retransmission data using Chase Combining among HARQ methods. In order to confirm that the retransmission was successful, the performance evaluation used LLR constellation. First, if there is an error in the data, the LLR value is not distributed at the corresponding position. in this case, a retransmission is performed to chase combine the previously stored error data and retransmitted data. As a result, the LLR value was distributed at the position of the corresponding LLR value per bit. Through this, it can be confirmed that error - free data is formed by using Chase Combining after retransmission.
Abstract
The TDD LTE MU-MIMO HARQ system is designed and implemented using GPU based on 3GPP Rel.10 standard. The system consists of the DU part of the base station and the terminal using the general computer based on the GeForce GTX TITAN graphics card provided by NIVIDIA, and constructed the part of the RU using USRP N210 provided by Ettus. In the implementation part, SDR standard is applied, so that various communication standards can be compatible with software. The retransmission is implemented by combining the previous data with the retransmission data using Chase Combining among HARQ methods. In order to confirm that the retransmission was successful, the performance evaluation used LLR constellation. First, if there is an error in the data, the LLR value is not distributed at the corresponding position. in this case, a retransmission is performed to chase combine the previously stored error data and retransmitted data. As a result, the LLR value was distributed at the position of the corresponding LLR value per bit. Through this, it can be confirmed that error - free data is formed by using Chase Combining after retransmission.
참고문헌 (9)
- "3G Generation Partnership Project(3GPP), TS 36.211 V10.7.0 Release 10, LTE; Evolved Universal Terrestrial Radio Access(E-UTRA);Physical channels and modulation", ~ (2013)
- SangWook Han, "Implementation of an MU-MIMO system with GPU modem for non-codebook-based TDD LTE-A", The 18th IEEE International Symposium, pp.22~25 (2014)
- LTE-Advanced for Mobile Broadband, "4G LTE", pp.2011, Erik Dahlman
- Kian Chung Beh, "PERFORMANCE EVALUATION OF HYBRID ARQ SCHEMES OF 3GPP LTE OFDAM SYSTEM", The 18th annual Symposium on Personal, Indoor and Mobile Radio Communications (2009)
- 이승학, "GPU를 이용한 SDR 시스템 용 LTE MIMO 기지국 기능 구현", (사)디지털산업정보학회 논문지, 8(4), pp.91~98 (2012), (사)디지털산업정보학회
- W. Tuttlebee, "The Software Defined Radio, Enabling Technologies" (2002), Jogn Wiley & Sons
- "3G Generation Partnership Project(3GPP), TS 36.212 V10.7.0 Release 10, LTE; Evolved Universal Terrestrial Radio Access(E-UTRA);Physical channels and modulation", ~ (2013)
- NVIDIA Corporation, "CUDA Programming Guide", NVIDIA Corporation, ~ (2009)
- Ettus Corporation, "USRP Hardware Driver and USRP Manual", ~