Development of SDR Testbed for Ultra-Dense Networks 


Vol. 44,  No. 6, pp. 1181-1187, Jun.  2019
10.7840/kics.2019.44.6.1181


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  Abstract

The ultra-dense network (UDN) is a next generation communication technology that can maximize spectral efficiency per unit area by simultaneously transmitting and receiving information through the same spectrum to multiple terminals through cooperative communication between a plurality of base stations arranged at very high density. In this paper, we design UDN test bed on 920 Mhz based on software defined radio (SDR) platform to improve spectral efficiency of UDN structure in ultra-high density environment and verify UDN core technology. The SDR platform for validating UDN core technologies includes: 1) a software structure that implements core technologies, 2) a hardware structure capable of transmitting and receiving wireless signals, and 3) a structure capable of monitoring the performance of core technologies. USRPs and NI LabVIEW NXG 2.1v are used as the hardware and software platforms, respectively. We have implemented various functionalities of the UDN by using the virtual instruments (VIs), which refer to functions in a LabVIEW software structure. The zero-forcing precoding is used to eliminate interference between terminals. The singular value decomposition (SVD) concept is applied to find out the null space that does not interfere with other terminals. We can modify the parameters such as modulation order, transmit power, and basis vector size, etc. in the top-level VI of the LabVIEW code and check the performance metrics such as bit-error rate (BER), signal-to-noise ratio (SNR), channel gain, and signal constellation of each receiver. We have conducted experiments that measure these performance metrics according to various parameters.

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  Cite this article

[IEEE Style]

D. S. Kang and K. W. Choi, "Development of SDR Testbed for Ultra-Dense Networks," The Journal of Korean Institute of Communications and Information Sciences, vol. 44, no. 6, pp. 1181-1187, 2019. DOI: 10.7840/kics.2019.44.6.1181.

[ACM Style]

Dong Soo Kang and Kae Won Choi. 2019. Development of SDR Testbed for Ultra-Dense Networks. The Journal of Korean Institute of Communications and Information Sciences, 44, 6, (2019), 1181-1187. DOI: 10.7840/kics.2019.44.6.1181.

[KICS Style]

Dong Soo Kang and Kae Won Choi, "Development of SDR Testbed for Ultra-Dense Networks," The Journal of Korean Institute of Communications and Information Sciences, vol. 44, no. 6, pp. 1181-1187, 6. 2019. (https://doi.org/10.7840/kics.2019.44.6.1181)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880