期刊名称：International Journal of Electronics Communication and Computer Technology
印刷版ISSN：2249-7838
出版年度：2013
卷号：3
期号：1
页码：365-367
出版社：International Journal of Electronics Communication and Computer Technology
摘要：Error is one of the most important fields in digital communication system. Since error is unavoidable during communication the error correcting codes are used to overcome this problem. Generally the error correcting codes length are derived by considering synchronous detection system however problem induced by these codes are reduce efficiency (because extra bits are needed to be transmitted) because the conditions for non synchronous detection is different. The probability of error for each symbol is not equal and this probability can also be modified by adjusting the shape of symbols also we can improve the spectral efficiency by assigning the different lengths of codes for each symbol depending upon their error probabilities. This paper presents the analysis of Twisted Amplitude Phase Shift Keying (TAPSK) for different channel conditions and different code length we mea sured the efficiency and the BER for this technique and then compared it with other techniques and the simulation result show s better efficiency and lower BER for TAPSK
