WIRELESS MIMO COMMUNICATION SYSTEM DESIGN USING TRANSFORMATION MATRIX AND POP MAPPED CODE

• Main Author: TAQWA (NIM : 33205009); Tim Pembimbing : Prof. Dr. Ir. Soegijardjo Soegijoko; Dr. Ir. Sugihart, AHMAD
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14750
• Institution: Institut Teknologi Bandung

This research is intended to build a 2x2 antennas MIMO system with ability to increase transmission rate, to minimize error rate, and to keep capacity optimal. The system is designed for fixed wireless communication with quasi-static, flat, independent, and Rayleigh fading channel such as WLAN and mobile phone with slow moving users. <br /> <br /> The research background comprises several problems: High-speed multimedia communication tends steadily increase; limited and expensive frequency bandwidth; lower transmit power; and channel fading. Therefore this research proposes a solution alternative to design MIMO system using transformation matrix and POP mapped code as main contribution. <br /> <br /> The research method goes as follows. If MIMO channels are perfectly known, then they can be decomposed become two parallel channels. Therefore, to keep capacity optimal, power control of each antenna can be set in transformation matrix according to the channel. To increase bit rate, this design uses POP scheme which maps bits into asymmetric pair-wise symbol in space-time matrix. But, bit number increasing can cause error rate increases. For compensation, this design utilizes some of bit gain to build temporal code. To minimize system complexity, MRC estimator is adopted particularly designed for POP scheme. <br /> <br /> Analysis and simulation results show that this design needs only 3 dB SNR at 10-3 BER and minimal 1.3 dB lower than comparable system. At this condition, this design reaches average 2.75 bps/Hz optimal capacities. Signaling rate of this design is 1.1 bit/(sHz) or 0.1 bit/(sHz) higher than all STBC-BPSK-2x2. The system complexity is also not more complex than similar system. <br /> <br /> Finally, it is concluded that the attainment of these results prove our research hypothesis about the ability of transformation matrix and POP in order to get array gain, diversity gain, and bit gain. For next research, POP design applied with other techniques in frequency-selective could be considered. <br />