Performance Evaluation of IEEE 802.16e (Mobile WiMAX) in OFDM Physical Layer
Independent thesis Advanced level (degree of Master (Two Years))Student thesisAlternative title
Performance Evaluation of IEEE 802.16e (Mobile WiMAX) in OFDM Physical Layer (Swedish)
WiMAX is introduced by the Institute of Electrical and Electronic Engineers (IEEE) which is standard designated 802.16d-2004 (used in fixed wireless applications) and 802.16e-2005 (mobile wireless) to provide a worldwide interoperability for microwave access. At present, telecommunication industries are highly concerned with the wireless transmission of data which can use various transmission modes, from point- to-multipoint links. It contains full mobile internet access. Various applications have already been applied so far using WiMAX, as alternative to 3G mobile systems in developing countries, Wireless Digital Subscriber Line (WDSL), Wireless Local Loop (WLL). IEEE 802.16e-2005 has been developed for mobile wireless communication which is based on OFDM technology and this enables going towards the 4G mobile in the future. In this thesis work, we built a simulation model based on 802.16e OFDM-PHY baseband and demonstrated in different simulation scenarios with different modulation techniques such as BPSK, QPSK and QAM (Both 16 and 64) to find out the best performance of physical layer for WiMAX Mobile. All the necessary conditions were implemented in the simulation according to the 802.16e OFDMA-PHY specification. The noise channel AWGN, Rayleigh fading, SUI, data randomization techniques, FFT and IFFT, and Adaptive modulation is used for the whole simulation procedure. The performance has been concluded based on BER, SNR and Pe output through MATLAB Simulation.
After all conditions we applied and the results we got we can conclude our work as follows, - We studied WiMAX OFDM physical layer, mobile systems, modulation techniques and features of WiMAX networks properly, with the help of necessary figures and tables. - We studied SUI-3 channel model and also implemented it through Matlab simulation to evaluate the performance of Mobile WiMAX. - We also used and understood the adaptive modulation techniques like, BPSK, QPSK, 16-QAM and 64 QAM according to IEEE 802.16e standard. We know that fading is one of the main parts of wireless communication. At the beginning of our simulation, we used multipath fading and then got some results using Rayleigh fading and AWGN. After that SUI-3 channel was used according to the characteristics of Rician fading. In all aspects of adaptive modulation technique, we can conclude the performance of Mobile WiMAX as, - Binary Phase Shift Keying (BPSK) is more power efficient and needs less bandwidth. - On the other hand 64-Qadrature Amplitude Modulation (64-QAM) has higher bandwidth with very good output. - In another case, Quadrature Phase Shift Keying (QPSK) and 16-QAM modulation techniques are in middle of those two (BPSK and 64-QAM) and they requires higher bandwidth. - QPSK and 16-QAM are less power efficient than BPSK. - During all simulations we got, BPSK has the lowest BER and 64-QAM has the highest BER than other modulation techniques. We also add some more things in here, - We included Cyclic Prefix (CP) and random signals which reduced noise resulting lower Bit error Rate (BER) for OFDM system but increased the complexity in the system. - Cyclic Prefix requires higher power but non Cyclic Prefix requires lower power.
Place, publisher, year, edition, pages
2009. , 93 p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:bth-2502Local ID: oai:bth.se:arkivexFBEADB9951FB97F2C125762600348058OAI: oai:DiVA.org:bth-2502DiVA: diva2:829781
Popescu, Professor Adrian