Implementasi Sistem Komunikasi Nirkabel OFDM Berbasis Software Defined Radio (SDR)

Abstract

Nowadays, wireless communication technology is developing rapidly. However, this technology still has some weaknesses, e.g. large bandwidth requirement and multipath fading. To overcome these weaknesses, MIMO OFDM technique is needed. This paper implements MIMO OFDM 2x2 communication system in Universal Software Radio Peripheral (USRP). The performance of MIMO OFDM 2x2 is shown by the throughput value. This value is compared to the throughput value of single carrier and SISO OFDM. The modulations used are BPSK, 4-QAM, and 16-QAM. In 4-QAM modulation, the throughput value of MIMO OFDM is significantly larger than throughput value of single carrier and SISO OFDM. The throughput value of single carrier communication system is 27.71 Mbit/s, while the throughput value of the SISO OFDM communication system is 60.27 Mbit/s, and the throughput value of the MIMO OFDM 2x2 communication system is 123.03 Mbit/s. Intisari-Dewasa ini teknologi komunikasi nirkabel berkembang dengan cepat. Meskipun demikian, teknologi ini masih memiliki beberapa kekurangan, yakni kebutuhan lebar pita yang besar dan adanya multipath fading. Untuk mengatasi hal tersebut, diperlukan adanya teknik MIMO OFDM. Makalah ini mengimplementasikan sistem komunikasi MIMO OFDM 2x2 pada Universal Software Radio Peripheral (USRP). Kinerja dari sistem komunikasi MIMO OFDM 2x2 ini dilihat dari nilai throughput. Nilai throughput tersebut dibandingkan dengan nilai throughput pada single carrier dan SISO OFDM. Modulasi yang digunakan ialah BPSK, 4-QAM, dan 16-QAM. Pada modulasi 4-QAM, throughput MIMO mengalami kenaikan yang signifikan dibandingkan single carrier dan SISO OFDM. Nilai throughput yang dihasilkan pada sistem komunikasi single carrier sebesar 27,74 Mbit/s, sedangkan nilai throughput pada SISO OFDM sebesar 60,27 Mbit/s, dan throughput pada MIMO OFDM 2x2 adalah sebesar 123,03 Mbit/s.

Design of Multi-band Microstrip Antenna with Rectangular Patch for 2.3 GHz, 2.4 GHz, and 3.5 GHz Frequencies

“…This, supported by an antenna in a MIMO (multi-input multi-output) system, must be planar, compact, and easy to manufacture. MIMO is a system consisting of several transmitting and receiving antennas on a wireless communication system transceiver device [11]. An antenna is a tool that can be used to support the integration of these networks.…”

Autocorrelation Method for Cyclic Prefix OFDM Estimation

“…A software approach in upgrading a system will provide a more cost-effective solution compared to a traditional hardware approach in a device. This technology is later recognized as Software Defined Radio (SDR) [1]. In its implementation, there are several functions in SDR, such as modulation/demodulation schemes recognition.…”

“…This system is more implementing radio-based software functions, thus it can be programmed according to needs. This technique is very efficient becuase it saves more costs in hardware implementation [1], [4].…”

“…The OFDM basic concept is a multi-carrier modulation which devides serial data with high data rate into parallel sub-bands so that it becomes a low data rate. Those low-data-rate signals are transmitted in parallel into several sub-carriers with mutually orthogonal carrier frequencies [1], [3].…”

Perancangan Antena Mikrostrip Mimo 2ã—2 Patch Persegi Panjang Pada Frekuensi Lte 2,3 GHZ

“…Oleh karena itu teknik MIMO menjadi salah satu komponen kunci dalam implementasi LTE. MIMO merupakan sistem yang terdiri dari sejumlah antena pengirim dan penerima pada perangkat transceiver sistem komunikasi nirkabel, dengan setiap antena mengirimkan data secara independen dan simultan [3]. Misalnya MIMO 22 merupakan antena MIMO dengan dua antena pengirim dan dua antena penerima.…”