In this paper, an implementation of MIMO 2x2 sys tem using Alamouti algorithm on Wireless Open Access Research Platform (WARP) is presented. The performance of the proposed system is evaluated in terms of Bit-error-rate (BER) for different environments that are indoor and outdoor which of each have Line-of-Sight (LOS) and non-Line-of-sight (NLOS) conditions. Afterwards, in order to validate the capability of the proposed system, SISO and MISO systems are also implemented. By an experimental analysis, MIMO system with NLOS condition in both indoor and outdoor environments show better performance than MISO and SISO. Meanwhile, for the conditions of LOS in both indoor and outdoor environment, the performance of SISO system is better than MIMO and MISO. In the case of NLOS conditions, the performance of proposed system is also examined and compared in the both environments. In indoor environment, at transmit power -21.48 dBm, MIMO, MISO and SISO systems have BER value of each of 1.172 x 10-4 , 1.146xl0-I , and 0.2551, respectively. Finally, in outdoor environment, at transmit power -25 dBm, MIMO system achieves BER of 0 better than MISO and SISO which achieves BER of 3.1 x 10-3 and 0.21, respectively.Keywords-bit error rate; line-oj-sigh; multipath; MIMO I. INTRODU CT IONAn increase in the need for data rate is currently very high, so that is required a technology that could solve this problem. MIMO is one of the technologies used to increase the capacity and the data rates of wireless communication systems. MIMO (Multiple Input Multiple Output) is defined as the usage of multi-antennas in transmitter and receiver of wireless communication system [1]. The ability of MIMO system to increase spectrum efficiency and data rate is achieved by employing space diversity [2]. In the literature, there exist several space time schemes for MIMO, such as Bell Laboratories Layered Space Time (BLAST) algorithm and Alamouti algorithm. BLAST algorithm was proposed for wireless communication system with Rayleigh fading channel, where the transmitter did not has the information of channel condition [3]. By using this algorithm, system capacity increases linearly in constant bandwidth and radiated power. Another scheme was proposed by Alamouti in 1998 which uses space time coding with 2 transmitter antennas and 1 receiver antenna. In order to increase the perfonnance system in tenns of data rate, Alamouti algorithm utilized simple transmit diversity in the transmitter side [4].Many implementations of MIMO system using Alamouti 978-1-4799-6432-1114/$31.00 ©20 14 IEEE 438 algorithm were reported [5]-[9]. In [5], a prototype plat form based on FPGA for MIMO System was proposed by implementing Alamouti scheme which utilized 2 transmitter antennas and 1 receiver antenna. FPGA-based OFDM System using Alamouti Algorithm with transmit diversity was also proposed in [6] for HDTV Transmission. Alamouti algorithm with detector log-likelihood ratio (LLR) at receiver antenna for MIMO System was also implemented on a FPGA [7]. The implementation of ...
Masjid Al Bayan sebagai pusat kegiatan keislaman dan masyarakat memiliki kendala belum adanya sarana dan prasarana untuk penyampaian informasi kepada masyarakat secara masif dan menarik. Hal ini terbukti ketika terjadi bencana kebakaran rumah warga respon masyarakat untuk penggalanagan dana bantuan sosial belum cepat. Pengumpulan bantuan dan pemberian bantuan ke korban rentang waktu satu minggu setelah terjadi bencana. Hal ini merupakan salah satu contoh kejadian sebagai sumber informasi yang perlu disampaikan kepada masyarakat dan jama’ah masjid Al Bayan. Sebagai tempat pusat kegiatan keislaman, sarana pendukung diperlukan untuk memberikan dampak yang lebih luas bagi masyarakat. Salah satunya dengan adanya teknologi papan informasi digital sebagai alat penyampai informasi yang lebih menarik dengan menampilkan infografis. Teknologi ini menggantikan peran papan pengumuman konvensional yang sangat terbatas menampilkan informasi dan kurang menarik. Teknologi ini mampu menampilkan informasi berupa teks, gambar digital (infografis) dan video. Jika terhubung ke jaringan internet, papan informasi digital ini juga mampu menampilkan video streaming dan halaman suatu website. Teknologi ini dilengkapi dengan minimum sistem berdaya rendah yang terhubung ke LED TV melalui port HDMI. Hasil dari penerapan alat Papan Informasi Digital mendapatkan hasil dari analisa survey usability yaitu nilai efisiensinya 93.5%, nilai efektifitasnya 91.6%, dan nilai kepuasannya 87.6% dengan rata-rata total nilai usability adalah 90.9% atau senilai 4.54 dalam skala 1-5. Selain implementasi teknologi diatas, penyebaran informasi melalui akun media sosial resmi masjid menjadikan jangkauannya menyentuh sampai kalangan milenial. Yaitu sebagai media komunikasi interaktif antara masyarakat luas dengan pengurus masjid selain juga sebagai media menyebarkan informasi konten digital. Dengan demikian penerapan teknologi ini dapat memberi manfaat kepada masyarakat luas dalam penyampaian informasi yang menarik melalui media digital.
The quality of the inhaled air affects the immune system and human health. If the air that is inhaled is dirty, it can interfere with daily human activities and one way to prevent it is to need a device that can identify and clean dirty air so that the need for clean air can be met and daily human activities will run smoothly. So in this final project, the author designed a Smart Air Purifier device to overcome the air contaminated by PM2.5 and PM10. The average error percentage value of the PM10 GP2Y1010AU0F sensor reading is 12.80%. This Smart Airpurifier device can perform purification in all types of rooms and different types of rooms. The advantage of this device is that it can clean air with various pollutants such as cigarette smoke, to PM10 particles below 10 g/m3. The effectiveness of the mode on the device has advantages and disadvantages to sterilize the air in the room. For example, when the PM10 value is above 300 g/m3, the high mode is effective for sterilizing dirty air, especially smokeKeywords: NodeMCU ESP8266, GP2Y1010AU0F Dust Sensor, Android, Realtime
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