• Shalu Antil
• Vinay Dawar

Wi-MAX (Worldwide Interoperability for Microwave Access) provides wireless broadband services to fixed and mobile stations in a large geographical metropolitan area. We can take the case of IEEE Wi-MAX/802.16 standard. This standard profile can deliver high efficiency over long distances and it support different qualities of services for broadband wireless metropolitan area networks (WMANs). It also offers a wireless effective backhaul network which enables the users to use high speed internet access to small and medium business and residential customers. This developing and growing cost-effective technology may also support internet access for Wi-Fi hot spots and cellular base stations through their respective access points. A number of broadband technologies can exist in the same wireless segment. These technologies can complete each other to get last mile infra structures. Wi-MAX may become an excellent solution in cases where it is very difficult to get such structures with other technologies. With having a large number of advantages, existing Wi-MAX have some disadvantages like high Bit Error Rate (BER) and Symbol Error Rate (SER). In this research work, an advanced system based on 4th generation WIMAX-OFDMA is proposed. In the proposed system, Wi-MAX has used orthogonal frequency-division multiple access (OFDMA) in implementing downlink and uplink. OFDMA is derived from as it is a multiple user type of the orthogonal frequency-division multiplexing (OFDM) . As we know, OFDM uses orthogonal subcarriers, which are orthogonal (90 phase difference) to each other i.e. the peak of one orthoginal subcarrier coincides with the null of the subcarriers next to it. This phenomenon avoids the reason of interference. By using orthogonal subcarriers the data which losts due to errors or disturbance is reduced by a great percentage. This is because, only and only the data of the effected subcarrier gets lost. Also, we have used an attenuator on Addtive White Gaussian Noise (AWGN) before adding it to data symbols (to be transmitted). By using this attenuator, we have overcomed from large Bit Error Rate (BER), Symbol Error Rate (SER) and Probability of Bit Error as compared to existing [1] WIMAX profile. This formula of the designed attenuator is drived from that of AWGN. We have used BER, SER and Probability of Bit Error as proposed method performance evaluation parameters. MATLAB 2013a is used as an implementation platform using Wireless Communication Toolbox and General MATLAB toolbox

Worldwide Interoperability for Microwaves Access (Wi-MAX), Orthogonal Frequency Division Multiplexing (OFDM), Additive White Gaussian Noise (AWGN), Bit Error Rate (BER), Interleaving, Modulation.

"PERFORMANCE EVALUATION OF ADVANCED WIMAX-OFDM WIRELESS COMMUNICATION USING BER & SER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 2, page no.152-163, February-2019, Available :http://www.jetir.org/papers/JETIR1902526.pdf

"PERFORMANCE EVALUATION OF ADVANCED WIMAX-OFDM WIRELESS COMMUNICATION USING BER & SER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 2, page no. pp152-163, February-2019, Available at : http://www.jetir.org/papers/JETIR1902526.pdf