OFDM在快速時變通道下會有子頻帶間干擾這個問題，這個問題也發生在使用頻域等化的單載波區塊傳輸系統，已經很多在OFDM下的消除子頻帶間干擾的演算法提出來。其中有些演算法也能夠同樣的適用在單載波區塊傳輸系統，然而隨著訊雜比上升殘留子頻帶間干擾會越顯明顯，在MMSE頻域等化中我們需要估計殘留子頻帶間干擾的變異數，而殘留子頻帶間干擾的變異數沒有估準確會導致相對應頻域等化會的殘留子頻帶間干擾放大。
在此論文裡，我們引進現有單載波區塊傳輸系統的子頻帶間干擾消除演算法，我們將之套入單載波區塊傳輸系統，為了要克服殘留子頻帶間干擾的影響，我們在偵測時使用k-best演算法來搜尋近最佳近似解，單載波區塊傳輸系統使用k-best演算法來偵測可以不需要估計殘留子頻帶間干擾的變異數並避免放大殘留子頻帶間干擾，論文最後模擬的結果證明我們成功克服殘留子頻帶間干擾造成的影響。

In fast time-varying channel, the orthogonal frequency division multiplexing (OFDM) system suffers from inter-subchannel interference (ICI). The problem of ICI also occurs in the single-carrier block transmission (SCBT) with frequency-domain equalization (FDE) system. Many algorithms of ICI reduction have been proposed for the OFDM system. Some of these algorithms are also suitable for the SC-FDE system. However, the effect of residual ICI becomes severe when the SNR increases. We need to estimate the variance of residual ICI in the FD equalization with the minimum mean-squares error (MMSE) principle. Moreover, an inaccurate estimate of the variance of residual ICI leads to ICI enhancement in the associated FD equalization.
In the thesis, we consider an ICI self-reduction algorithm for the SC-FDE system. In order to prevent the enhancement of residual ICI after the ICI self-reduction, we apply the K-Best algorithm in detection to search for the near maximum-likelihood (ML) solution. With the detection based on k-best algorithm, we need not to estimate the variance of residual ICI and this can avoid the residual ICI enhancement. The simulation results validate our method.

[1] X. Huang, “Diversity performance of precoded OFDM with MMSE equalization,” ISCIT2007, pp. 802-807, Oct. 2007.
[2] M. X. Chang, “A Novel Algorithm of Inter-Subchannel Interference Self-Cancellation for OFDM Systems,” IEEE Trans. Wireless Commun., vol. 6, no. 8,pp. 1881-1893, Aug. 2007
[3] Y. Zhao and S.-G. Häggman, “Intercarrier Interference Self-Cancellation Scheme for OFDM Mobiles Communication Systems,” IEEE Trans. Commun.,vol.48, pp. 1185-1191, Jul. 2001
[4] W. G. Jeon, K. H. Chang, and Y. S. Cho, “An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels,” IEEE Trans. Commun1, vol. 47, pp. 27-32, Apr. 1999.
[5] A. Seyedi and G. J. Saulnier, “General ICI Self-Cancellation Scheme for OFDM systems,” IEEE Trans. Veh. Technol., vol. 54, pp. 198-210 Jan. 2004.
[6] J. Ma, P. V. Orlik, J. Zhang, and Y, Li, “Reduced-rate OFDM Transmission for Inter-subchannel Interence Self-cancellation over High-mobility Fading channels," IEEE Trans. Wireless Commun., vol. 11,pp. 2013-2023,Jun. 2012
[7] F. Pancaldi, G. M. Vitetta, R. Kalbasi, N. Al-Dhahir, M. Uysal, and H. Mheidat, “Single-Carrier Frequency Domain Equalization,” IEEE Signal Process. Mag., vol. 25, no. 5, pp. 37-56, Sept. 2008.
[8] M. X. Chang, “Characterization of Single-Carrier Block Transmission under the Precoded OFDM Architecture,” inISWPC2010,pp. 381-385, May. 2010.
[9] M. X. Chang, “Realizable Ideal D/C and C/D Conversions for Bandlimited Periodic Signals and Characteristics of Single-Carrier Block Transmission,” in IEEE Trans. Signal Process.,vol. 59, pp. 1670-1682, Apr. 2011
[10] M. X. Chang, and Y. T. Su, “Model-Based Channel Estimation for Equalizing OFDM Signals,”in IEEE Trans. Commun., vol. 50, pp. 540-544, Apr. 2002.
[11] M. X. Chang, “A New Derivation of Least-squares-fitting Principle for OFDM Channel Estimation,” in IEEE Trans. Wireless Commun., vol. 5, pp. 726-731, Apr. 2006.
[12] Y. Li and X. Huang, “The Simulation of Independent Rayleigh Faders,” IEEE Trans. Commun., vol. 50, no. 9, pp. 1503-1514, Sept. 2002.
[13] “Guidelines for the Evaluation of Radio Transmission Technologies for IMT-2000,” Recommendation ITI-R M.1225, 1997.
[14] L. Wei, G. Tan, C. Ming, S. Cheng, H. Wang, “The Single Carrier Frequency Domain Equalization Transceiver with Self-Cancellation,” IEEE PIMRC’07, pp. 1-4, Sept. 2007.
[15] Z. Guo and P. Nilsson, “Algorithm and implementation of the K-best sphere decoding for MIMO detection,” IEEE J. Sel. Areas Commun.,vol. 24, no. 3, pp. 491-503, Mar. 2006.
[16] C. F. Liao, J. Y. Wang and Y. H. Huang, “A 3.1 Gb/s 8 × 8 Sorting Reduced K-Best Detector With Lattice Reduction and QR Decomposition,” IEEE Trans. VLSI. Syst., vol. 22, no. 12, pp. 2675-2688, Feb. 2014.