單載波區塊傳輸之優點在於可使用複雜度較低之頻域等化器，且相較於正交分頻多工系統，單載波區塊傳輸並沒有峰值對均值功率比過高的問題。為了等化多路徑通道的干擾，接收端需要對通道響應作估測。在這篇論文中，我們提出了一些在單載波區塊傳輸系統中對於通道估測的演算法和方法。
我們使用時域和頻域之引導信號來對通道作一維與二維的估測，在時域通道估測中，引導信號為在傳送區塊前的一根脈衝。而在頻域通道估測中，引導信號為在子頻帶上已知信號之組成。在通道估測中我們還使用了最小回歸曲線法來取得更精確的估測。此外，我們根據時域與頻域的引導信號拓展為二維的通道估測。在較長的延遲以及較高的複雜度代價下，二維通道估測會有較佳的結果。

he single-carrier block transmission system can use the low-complexity frequency-domain equalization, and it does not have the problem of high Peak-to-Average Power Ratio (PAPR), like that in the orthogonal frequency-division multiplexing (OFDM) system. To equalize the multipath channel, the receiver needs to estimate the channel responses. In this thesis, we study some channel estimation algorithms and schemes for the single-carrier block transmission system.
We consider 1D and 2D channel estimation schemes based on frequency-domain and time-domain pilot signals, respectively. For the time-domain channel estimation, pilot signal is an impulse ahead of each transmitted block, while for the frequency-domain channel estimation, pilot signals are composed of pilot symbols across subchannels. The Least Square Fitting (LSF) principle is applied in the channel estimation. We also study the 2D schemes for channel estimation based on time-domain and frequency-domain pilot signals. The 2D schemes results in better performance at the price of longer delay and higher complexity.

[1] Y. Li, and X. Huang, “The Simulation of Independent Rayleigh Faders,” IEEE Trans. Commun., vol. 50, NO. 9, pp. 1503-1514, Sept. 2002.
[2] M. X. Chang and Y. T. Su, “2-D regression channel estimation for equalizing OFDM signals,” Proc IEEE 51th Vehicular Technology Conference, Tokyo, pp. 240-244, May 2000.
[3] M. X. Chang and Y. T. Su, “Model-based channel estimation for equalizing OFDM signal,” IEEE Trans. Commun., vol. 50, pp. 240-544, Apr. 2002.
[4] M. X. Chang and Y. T. Su, “Performance Analysis of Equalized OFDM System in Rayleigh Fading,” IEEE Trans. Commun., vol. 1, NO. 4, October 2002.
[5] M. X. Chang, “A new derivation of Least-Square-Fitting principle for OFDM channel estimation,” IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 5, NO. 4, APRIL 2006.
[6] Peter Hoeher, Stefan Kaiser, and Patrick Robertson, ”Two-Dimensional Pilot-Symbol-Aided Channel Estimation, ” ISIT 1997, Ulm. Germany, June 29 – July 4.
[7] Peter Hoeher, “TCM on Frequency-Selective Land-Mobile Fading Channels,” et al. – 1991
[8] Kun-Chien Hung and David W. Lin, “Pilot-Based LMMSE Channel Estimation for OFDM systems With Power-Delay Profile Approximation,” IEEE TRANSACTIONS ON VECHNOLOGY, VOL. 59, NO.1, JANUARY 2010.
[9] Die Hu, Lianghua He, and Luxi Yang, “Joint Pilot Tone and Channel Estimator Design for OFDM System,” IEEE COMMUNICATIONS LETTERS, VOL. 10, NO. 10, OCTOBER 2006.
[10] Hyung G. Myung, Junsung Lim, and David J. Goodman,” Single Carrier FDMA for Uplink Wireless Transmission,” IEEE Veh. Technol., pp. 30-38, Sep. 2006.
[11] Hyung G. Myung,” Introduction to Single Carrier FDMA,” 15th EUSIPCO, Poznan, Poland, September 3-7. 2007,
[12] Zheng Wang, Xiaoli Ma, and Georgios B. Giannakis, “OFDM or Single-Carrier Block Transmission?, ” IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 52, NO.3, MARCH 2004.
[13] Khaled Amleh, Hongbin Li, and Tao Li, “Robust Channel Estimation and Detection for Single-Carrier and Multicarrier Block Transmission Systems,” IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 59, NO.2, FEBRUARY 2010.
[14] Fabio Coelho, Rui Dinis, and Paulo Montezuma, “Efficient Channel Estimation for OFDM and SC-FDE Schemes,” Computer Communications and Networks (ICCCN), 2011 Proceedings of 20th International Conference on July 31 2011-Aug. 4 2011.
[15] Khaled Amleh and Hongbin Li,” Channel Estimation and Detection for Single
Carrier Systems,” Communications Theory Workshop, 2009. AusCTW 2009. Australian.