Low complexity downlink channel estimation for LTE systems

  • Authors:
  • Md. Masud Rana;Jinsang Kim;Won-Kyung Cho

  • Affiliations:
  • Department of Electronics and Radio Engineering, Kyung Hee University, Gyeonggi, Republic of Korea;Department of Electronics and Radio Engineering, Kyung Hee University, Gyeonggi, Republic of Korea;Department of Electronics and Radio Engineering, Kyung Hee University, Gyeonggi, Republic of Korea

  • Venue:
  • ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
  • Year:
  • 2010

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Abstract

The 3rd generation partnership project (3GPP) long term evolution (LTE) is designed for high speed data rate, higher spectral efficiency, improved services, and lower latency as well as high-capacity voice support. LTE uses orthogonal frequency division multiplexing access (OFDMA) scheme for the downlink transmission and single carrier frequency division multiple access (SCFDMA) in uplink. Main challenges for a terminal implementation are efficient realization of the inner receiver, especially for channel estimation (CE) and equalization. In this paper, a new channel estimator is presented for an OFDMA system under the umbrella of the 3GPP LTE that can avoid the ill-conditioned least square (LS) problem. This channel estimation method uses knowledge of channel properties to estimate the unknown channel transfer function at nonpilot sub-carriers. Therefore, the computational complexity can be reduced significantly.