Unjuk Kerja Kode Hybrid Orthogonal Small Set

Pada penelitian ini, unjuk kerja kode hybrid orthogonal small set dengan panjang 16 chip dievaluasi. Hasil penelitian menunjukkan bahwa auto-correlation function (ACF) and  cross-correlation function (CCF) kode hybrid hampir sama dengan  kode existing orthogonal small set Kasami. Kode existing orthogonal small set Kasami memiliki unjuk kerja BER (bit error rate) sedikit lebih baik dari pada kode hybrid orthogonal small set pada kondisi kanal Rayleigh frequency selective fading  dalam sistem synchronous CDMA. Namun, kode hybrid orthogonal small set memiliki jumlah kode lebih banyak dalam chip set, karenanya dapat menampung lebih banyak user pada suatu  base station. Sehingga, kode hybrid orthogonal small set lebih tepat untuk diterapkan dalam sistem synchronous  CDMA. . </p

SIMULASI UNJUK KERJA MIMO DENGAN ARSITEKTUR V-BLAST PADA KANAL FLAT FADING RAYLEIGH

Salah satu teknik untuk merealisasikan efisiensi spektrum pada link wireless adalah sistem MIMO denganarsitektur V-BLAST (Vertical-Bell Laboratories Layered Space Time), yang memakai beberapa antena padapemancar dan penerima. Sistem V-BLAST dalam mendeteksi informasi yang diterima, memilih kanal yang terbaikdari beberapa kanal yang ada dalam sistem sehingga sistem V-BLAST memiliki unjuk kerja yang lebih baik darisistem SISO

Evaluation of DVB-T2 Digital TV Propagation Performance in the Bali Broadcast Area

The development of terrestrial television broadcasting technology in the world today is switching from analog broadcasting systems to digital broadcasting systems. Analog Switch Off (ASO) is the period when analog broadcasts are stopped and replaced with digital broadcasts. Through the jargon "Clean Picture, Clear Sound, Advanced Technology" people will feel better quality than analog TV. In the era of digital broadcasting, TV viewers not only watch broadcast programs but can also get additional facilities such as EPG (Electronic Program Guide) to find out the programs that have been and will be aired later. With digital broadcasting, there is the ability to provide interactive services where viewers can directly rate the sound of broadcast programs in addition to the presence of features that can be utilized, such as features related to disaster information. In this study, an evaluation of the performance of DVB-T2 Digital TV propaganda will be carried out in the Bali service area. The quality of digital TV broadcasts in the Bali broadcast area is influenced by signal propagation which is parameterized by parameters C / N (or S / N), Modulation Error Rate (MER), Bit Error Rate (BER) by measuring at the test point or location of the test point/test measurement which is the outermost limit of the service area under the Minister of Communication and Information no 23 / PER / M.KOMINFO / 11/2011. So this research can be produced a map of the quality of broadcasting services in Bali which can be used as an indicator to avoid Bali from blank spot areas that can be recommended for Digital TV operators in Bali for repeater installation planning

Pulse shaping methods for inter carrier interference reduction in OFDM system

The weakness of the orthogonal freuency division multiplexing (OFDM) system is susceptible to the existence of carrier frequency offset (CFO) which causes the emergence of inter carrier interference (ICI) which causes a degradation of performance OFDM systems. This study aims to apply the suggested rectangular (REC) pulse and improved sinc-power (ISP) pulse shaping methods on OFDM system and determines ICI reduction with the effects of CFO over flat fading Rayleigh channels. The performance of each pulse shaping method is evaluated and compared based on parameter ICI power vs. normalized frequency offset, signal to interference ratio (SIR) vs. normalized frequency offset and bit error rate (BER) vs. energy bit per noise (Eb/No). The simulation result in terms of BER vs. Eb/No indicated that REC and ISP pulse shaping has better performance dealing with ICI reduction compared to OFDM system no applied pulse shaping. In addition, the ISP is able to mitigate ICI better than REC

ANALISIS VARIASI JUMLAH ANTENA TERHADAP UNJUK KERJA SISTEM ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) MULTIPLE INPUT MULTIPLE OUTPUT (MIMO)

OFDM is a transmission technique using orthogonal multi-carrier which can save bandwidth. While MIMO is a technique of using more than one antenna for transmitting and receiving. This can increase data transmission capacity without increasing bandwidth. In this study, an analysis of variations MIMO antennas 2x2, 2x4, 4x2, and 4x4 was carried out to determine the effect of antenna variations on OFDM MIMO performance. The modulation are BPSK and QPSK with frequency selective fading and AWGN channels. Performance parameters are Bit error rate (BER) versus Energy Bit per Noise (Eb/No), Power to Average Peak Ratio (PAPR), and eye diagram. The model simulated using a simulink with a number of input 100,000 bits. The results showed that BER performance compared to Eb/No, in MIMO 2x4 and 4x4 produced better performance than MIMO 2x2 and 4x2. With many receiving antennas, it gets a better signal which can reduce the occurrence of errors. Meanwhile, in PAPR parameter, 4x2 and 4x4 MIMO produce higher PAPR values than 2x2 and 2x4 MIMO. With the number of antennas, the PAPR value is distributed over all antennas and increase the PAPR value in the system. In the eye diagram parameters, the greater the Eb/No value, make a better eye diagram

Desain Perangkat Lunak SMS dengan Translasi Text Aksara Bali

Sebagian besar masyarakat Bali mampu berkomunikasi menggunakan bahasa Bali, akan tetapi hanya sedikit orang Bali yang mampu dan mengerti tata penulisan Aksara Bali. Hal ini terjadi karena tata cara penulisan Aksara Bali aturannya cukup kompleks. Diperlukan cara-cara yang inovatif untuk menarik minat masyarakat dalam mempelajari Aksara Bali, salah satunya dengan memanfaatkan teknologi informasi. Penelitian ini membahas desain perangkat lunak SMS dengan translasi text Aksara Bali. Dalam pembuatan desain perangkat lunak ini terdiri dari beberapa tahapan, yaitu: pengumpulan data dan literatur, identifikasi permasalahan, desain dan perancangan sistem, serta implementasi dan pengujian. Hasil desain translasi text Aksara Bali pada perangkat lunak SMS berupa: perancangan proses translasi text Aksara Bali, perancangan proses pegiriman SMS, dan perancangan proses penerimaan SMS. Sedangkan desain antar muka translasi text Aksara Bali pada perangkat lunak SMS berupa desain antarmuka pengiriman dan penerimaan SMS

Novel Hybrid Orthogonal Large Set Code Sequence for High Density Wireless Networks

CDMA technique has been successfully employed to implement high capacity mobile networks with optimum channel bandwidth utilization. The two most coveted criteria for the spreading codes used in such network are, the number of codes in the set and the code orthogonality, in order to ensure accommodation of large number of users and as well as minimal interference between the users. Walsh code has proved to be a popular orthogonal code, whereas m-sequence, Gold code and Kasami code have established themselves as popular non-orthogonal binary codes. Small set Orthogonal Kasami code has been proposed and evaluated by researchers for CDMA applications. In this paper the authors report the design of hybrid orthogonal large set (HOLS) code for synchronous CDMA systems. The HOLS code was evaluated in a synchronous CDMA system over different channel conditions. The authors also demonstrate that the BER performance of the HOLS code is comparable to that of the existing orthogonal codes, but outperforms Gold and large set Kasami code sequences. The HOLS code sequence is also shown to outperform the existing code sequences in the number of cells it can support. In terms of multiple access interference (MAI), the cross-correlation function (CCF) of the HOLS code sequence is comparable to that of Walsh and orthogonal small set Kasami codes, and much better than those of Gold and large set Kasami code sequences. HOLS code sequence has comparable auto-correlation function (ACF) with that of Gold, large set Kasami and orthogonal small set Kasami code sequences and a much better ACF than that of Walsh code sequence

New Orthogonal Small Set Kasami Code Sequence

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