In this paper, the authors propose the design of a new orthogonal small set Kasami code sequence generated using combination of non-orthogonal m-sequence and small set Kasami code sequence. The authors demonstrate that the proposed code sequence has comparable auto-correlation function (ACF), cross- correlation function (CCF), peak cross-correlation values with that of the existing orthogonal small set Kasami code sequence. Though the proposed code sequence has less code sequence sets than that of the existing orthogonal small set Kasami code sequence, the proposed code sequence possesses one more numbers of members in each code sequence set. The members of the same code set of the proposed code sequence are orthogonal to each other.

Opini merupakan salah satu bagian terpenting dalam pengambilan keputusan, dalam pengolahan opini memerlukan proses analisa yang menyeluruh. Terutama opini yang berbasis teks, dimana opini berupa pendapat tidak memiliki batasan nilai pasti untuk masukan yang diberikan. Sentiment Analysis sebagai cabang ilmu dari Text mining bisa diterapkan dalam proses analisa opini yang berupa teks. Dimana opini akan diklasifikasikan menjadi 3 jenis opini, yaitu opini positif, opini netral dan opini negative. Penelitian ini melakukan pengelompokan opini dari alumni Perguruan Tinggi dengan menggunakan algoritma SVM dan NBC dimana dalam penelitian ini dibagi menjadi 3 komponen utama yaitu komponen input, sistem pengelompokan opini, serta komponen output. Opini yang akan diolah merupakan data berupa file opini format *.csv, yang selanjutnya melakukan proses pengelompokan terhadap opini. Kemudian sistem menghasilkan output berupa 3 jenis opini yaitu, opini positif, opini netral dan opini negative. Dari hasil pengujian secara umum menunjukkan akurasi dengan nilai akurasi tertinggi pada algoritma NBC mencapai 94,45%, sedangkan tingkat akurasi tertinggi pada algoritma SVM mencapai 75,76%.

Abstract— The development of cellular telecommunication provides users to experience fast and stable transmission. This standard of transmission is proportional to the needs of the devices and systems used. We are currently in the fourth generation (4G) of cellular technology. The key technologies used in 4G are Orthogonal Frequency Division Multiplexing (OFDM) which uses the concept of orthogonality for bandwidth efficiency and Multiple Input Multiple Output (MIMO) which uses the concept of diversity to improve performance. But in implementation this system will have problems with the transmission channel. The problem that occurs is signal attenuation due to Carrier Frequency Offset (CFO). This CFO will cause the orthogonal character built from the OFDM system to experience a decline in performance. The decline in performance is due to the occurrence of Intercarrier Interference (ICI). To overcome this problem, the method used in this simulation are Improved Sinc Power Pulse (ISP) and Rectangular Pulse (REC). The results showed that ISP had a relatively better BER value than REC and without using the pulse shaping method. The minimum BER value obtained from the simulation is ISP with a value of 0.0001 while REC produces a value of 0.0006 and without pulse shaping produces a BER value of 0.0038.