超越正交多階層時空碼

Super-Orthogonal Multilevel Space-Time Codes

陳羿廷(I-Ting Chen)

指導教授 ： 馬尚智

中原大學/工學院/電機工程研究所/碩士(2008年)

https://doi.org/10.6840/CYCU.2008.00060

摘要

在無線傳輸的環境中，由於通道衰減的效應以及信號間互相的干擾，使得在接收端的所收到的信號產生嚴重的失真。為了降低通道衰減對信號傳送所帶來的影響，Foschini 與 Gans 及 Telatar證明了多重輸入多重輸出的系統除了可以經由空間分集來抵抗通道的衰減，同時也能增加系統的容量。這些發現引發了時空碼的研究，時空碼結合了通道編碼與多傳輸天線設計而能有效應用於多路徑干擾之無線通道。
　　為了獲得近似最佳性能，可以藉由結合多階層編碼的設計與時空區段碼子集分割的概念，建構出多階層時空碼，但是卻有傳輸率下降的缺點。
　　因此，我們提出了一種時空籬柵碼的新設計，藉由聯結迴旋碼與多階層時空碼的擴展集合，而這項新設計不會損失碼率卻有相當良好的性能。

關鍵字

時空籬柵碼 ； 迴旋碼 ； 多階層時空碼

並列摘要

In wireless communication environments, the reliability of received signals degrade seriously at the receiver because of the effects of fading channels and signals jamming by each other. In order to reduce the influence of fading channel that cause by signal transmission. Foschini,Gans and Telatar proved that multiple input multiple output can introduce spatial diversity and increase information capacity. These results have motivated a new area in error correcting codes. Space-Time Coding (STC) schemes combine the channel code design and the use of multiple transmit antennas.
In order to get the better performance. By the design concept of multilevel coding, a multilevel space-time code is constructed. But also have drawbacks just like coding rate decreasing
So, we propose a novel space-time trellis coding scheme by concatenating a simple convolutional code and an expanded set of multilevel space-time codes. The proposed scheme without losing coding rate but has good performance.

並列關鍵字

convolutional codes ； Space-time trellis codes ； multilevel space-time codes

參考文獻

[1] G..J .Foschini and M . J. Gans, “On limits of wireless communications in a fading environment when using multiple antennas. ”Wireless. Pres. Commun . vol6 ,pp .311-335,Mar. 1998

[3] V. Tarokh, N.Seshadri and A. R. Calderbank , ” Space-time Codes for high data rate wireless communication performance Criterion and code construction, ”IEEE. Trans. Inform. Theory, vol44,pp.744-765,Mar. 1998

[4] S.Almouti “A simple transmit diversity technique for wireless communications ”IEEE J. Select Areas Commun. , vol. 16, pp.1451-1458, Oct. 1988.

[5] D. Agrawal, V. Tarokh, A. Naguib, and N. Seshadri, “Space–time coded OFDM for high data-rate wireless communication over wide-band channels,” in Proc. IEEE Vehicular Technolgy Conf.,Ottawa, ON, Canada, May 1998, pp. 2232–2236.

[6] Y. Li, N. Seshadri, and S. Ariyavisitakul, “Channel estimation for OFDM systems with transmitter diversity in mobile wireless channels,”IEEE J. Select. Areas Commun., vol. 17, pp. 461–471, Mar.1999.