Performance analysis of IEEE 802.11ac based WLAN in wireless communication systems

ABSTRACT


INTRODUCTION
Recently, wireless communications have fundamentally developed because of the trend setting innovation of cell phones, convenient gadgets and the fast development of Internet of Things (IOT) [1], astute transportation frameworks and person to person communication. IEEE 802.11 is a well-known standard that widely used to control the physical layer determinations for executing wireless local area network (WLAN) computer for various frequency bands such as 900 MHz and 2.4, 3.6, 5, and 60 GHz [2].
At 1997 the basics of IEEE 802.11 was discharged and then the results were revised. This system with its corrections are focusing on the items of wireless systems such as Wi-Fi. On the other hand, every modification is revoked when it is established in the last version of the system. The companies resort to market to get the corrections and updates in order to improve the capabilities of products. These revised systems will become new standards. Wireless communications heading towards high bandwidth of data transmission for multi-users at the same time. IEEE 802.11 standards evolution is shown in Figure 1.
This paper introduces the history of IEEE 802.11 standard in section 2. While section 3 presents how IEEE 802.11 developped and improved to IEEE 802.11ad.The simulation results with detailed discussions are presented in section 4. Finally, the important conclusions and some suggestions for further improvement of the proposed work are discussed in section 5.  STANDARD IEEE 802.11a utilizes similar information connect layer convention and casing group to the first one even the used air interface is OFDM. This IEEE standard is working on 5 GHz band also the peak data rate reaches to 54 Mbps. On the other hand, the throuhput is around 20 Mbps and this value is obtained according to the code of error correction distinctive correspondence frameworks such as GSM, LTE and WLAN which give remote web access to assortment of uses.
The utilization of mobile as an instrument to access the services of internet daily turns out to be more pressing and fruitful advancement of mobile wireless technology builds the capacity to make high throughput and minimal effort systems for the client in-movement. Giving intelligent transportation frameworks stable wireless internet association has turned into an appealing examination field for a long time. Among the numerous innovations suggested for frameworkswith intelligent transmission, wireless communications and vehicle to individual correspondence, means to build drivers and travelers comfort, street security and transport efficiency and give pervasive wireless network to the internet [4]. While IEEE 802.11b has a most extreme crude information rate of 11 Mbps, and furthermore utilizes similar media access. IEEE 802.11b items showed up on 2000, Wireless communications are ending up progressively imperative for their flexibility, portability and speed. It is the situation of microwave and laser based innovations, e.g. Wi-Fi and free space optics, individually. The significance and usage of Wi-Fi have been developing for supplementing conventional wired systems. Wi-Fi has had an expanding nearness in the individual home, shaping a remote individual territory arrange, enabling individual gadgets to impart. Pointto-point and point-to-multipoint arrangements are utilized both inside and outside, requiring specific directional and omnidirectional radio wires [5].
Confirmed the IEEE 802.11g in 2003 it works (like IEEE 802.11b), in the 2.4 GHz band, likewise utilizes the same OFDM based transmission. IEEE 802.11g is the third adjustment standard for remote LANs. This standard is working in 2.4GHz band and has raw data rate of 54Mbps. The throughput of this IEEE 802.11g reachs 31.4 Mbps if the used multiple access depends the scheme of avoiding collisionin transmission; this troughput is for 1500 bytes with wireless rate of 54 Mbps. In fact, this throughput can not be achieved practically due to the implementation of access points, so throughput of packets with size less than 1500 bytes will have throughput around 3 Mbps if the used rate is 54 Mbps and the packets have 64 bytes [6].
IEEE 802.11 based WLANs are generally utilized in view of its adaptability; Higher throughput can be achieved by upgrading the execution medium access control layer all things considered medium access control layer (MAC) outline total component can be utilized. This standard has two types of casing total: MAC protocol data unit aggregation and the other is MAC service data unit aggregation [7]. IEEE 802.11n is a change that enhances the past IEEE 802.11 standards by including MIMO antennas i.e. multiple input antennas and multiple output antennas. On the other hand, IEEE 802.11n is working on two bands: 2.4 GHz and 5GHz. The peak data rate of this standard may reach 600 Mbps intead of 54 Mbps as confirmed bt IEEE and distributed in 2009. Finally, in 2013 IEEE 802.11 is revised to IEEE 802.11 ac. It constructed in light of the 802.11n standard. also, standard is distributed in 2013,which expands on IEEE 802.11n and it guarantees that throughput has high level, it utilizes high transfer speed and high quantities of MIMO, and high requests of modulations [8].

SIMULATION AND RESULTS
The simulation supports the IEEE 802.11a, IEEE 802.11n and IEEE 802.11ac standards with an extensive variety of settings. A block diagram showing the fundamental circle of the simulation is shown in Figure 2. The following subsections clarify each block in more subtle details. As shows in Figure 3(a), we used type of modulation called BPSK with MSC (0) and code rate; With code rate 1/2 and we noticed that the maximum value of bit error rate is 9.98e-06 dB when single noise ratio (SNR) is dB and in theoretical when SNR is 10 dB the value of BER is 3.872e-06.
As shows in Figure 3(b), we used type of modulation called with QPSK 3/4 MSC (2) and code rate 3/4 and we noticed that the maximum value of bit error rate is 9.98e-5 dB when single noise ratio (SNR) is 10 dB and in theoretical when SNR is 15 dB the value of BER is 9.361e-09.
As shows in Figure 3(c), we used type of modulation called with 16 QAM 1/2 MSC (3) and code rate 1/2 and we noticed that the maximum value of bit error rate is 1.999e-05 when single noise ratio (SNR) is 20 dB and in theoretical when SNR is 20 dB the value of BER is 1.999e-05. Figure 4(a), we used type of modulation called with 16 QAM 3/4 MSC (4) and code rate 3/4 and we noticed that the maximum value of bit error rate is 0.0043 when single noise ratio (SNR) is 15dB and in theoretical when SNR is 20 dB the value of BER is 2.904e-06. Figure 4(b), we used type of modulation called with 64 QAM 2/3 MSC (5) and code rate 2/3 and we noticed that the maximum value of bit error rate is 4.999e-05 when single noise ratio (SNR) is 25 dB and in theoretical when SNR is 25 dB the value of BER is 4.999e-05 While Figure 4(c), we used type of modulation called with 64 QAM 3/4 MSC (6) and code rate ¾ and we noticed that the maximum value of bit error rate is 2e-05 when single noise ratio (SNR) is 25 dB and in theoretical when SNR is 25 dB the value of BER 2e-05. Figure 5(a), we used type of modulation called with 64 QAM 5/6 MSC (7) and code rate 5/6 and we noticed that the maximum value of bit error rate is 3.999e-05 when single noise ratio (SNR) is 25 dB and in theoretical when SNR is 25 dB the value of BER is 3.999e-05.  Figure 5(c), we used type of modulation called with 256 QAM 5/6 MSC (9) and code rate 5/6 and we noticed that the maximum value of bit error rate is 0.00013 when single noise ratio (SNR) is 30 dB and in theoretical when SNR is 35 dB the value of BER 2.495e-10. As a result, Figure 6 summarizes the performance of the system with different modulation techniques. So it is preferable to use the BPSK in transmitting the data on the AWGN channel.

CONCLUSIONS
This paper presents an adequate analysis and results of the IEEE 802.11ac standard. It also shows its capability to efficiently perform with the modern communication systems with acceptable performance. IEEE 802.11 standards give portability support to voice correspondence, wireless information systems can be partitioned into a few sorts relying upon their zone of scope. Through range changes and speedier remote transmissions, IEEE 802.11ac, ad and 802.11ax promotion are enhancing the execution of superior quality TV and computerized video streams in the home and propelled applications in big business systems. They enhance generally client encounter where and at whatever point individuals are associated. All the applied improvements are designed to increase the speed of data transportation. On the other side, the frequency will be different because IEEE 802.11ad uses unlicensed 60 GHz band and shorter range transmissions. The research paper summarizes the execution of the framework with various modulation methods and it is desirable over utilize the BPSK adjustment method for transmission of the data information in the AWGN channel.