An Improved LLR Generation Technique for SC-FDMA Systems Using Frequency Domain MMSE Equalization 


Vol. 34,  No. 12, pp. 1197-1207, Dec.  2009


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  Abstract

Orthogonal Frequency Division Multiple Access (OFDMA) is widely used as a multiple access technique for next generation mobile communication systems, however, its main drawback is the high peak-to-average ratio (PAPR). Thus for the uplink case where the transmit power is strictly limited due to the battery life of mobile units, single carrier frequency division multiple access (SC-FDMA) with low PAPR is preferred to OFDMA method. In this paper, we propose a method to improve the performance of SC-FDMA using frequency domain MMSE equalization. The proposed improved log-likelihood ratio (LLR) generation method exploits both the diversity characteristic of channels and the reciprocity that is obtained from the received signals. The complexity of the proposed method is analyzed and its performance gain is demonstrated via a set of computer simulations.

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  Cite this article

[IEEE Style]

J. Kim, T. Im, J. Kim, J. Yi, Y. S. Cho, "An Improved LLR Generation Technique for SC-FDMA Systems Using Frequency Domain MMSE Equalization," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 12, pp. 1197-1207, 2009. DOI: .

[ACM Style]

Jin-min Kim, Tae-Ho Im, Jaekwon Kim, Joo-Hyun Yi, and Yong Soo Cho. 2009. An Improved LLR Generation Technique for SC-FDMA Systems Using Frequency Domain MMSE Equalization. The Journal of Korean Institute of Communications and Information Sciences, 34, 12, (2009), 1197-1207. DOI: .

[KICS Style]

Jin-min Kim, Tae-Ho Im, Jaekwon Kim, Joo-Hyun Yi, Yong Soo Cho, "An Improved LLR Generation Technique for SC-FDMA Systems Using Frequency Domain MMSE Equalization," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 12, pp. 1197-1207, 12. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880