DESIGN AND PERFORMANCE ANALYSIS OF MIMO-OFDM FOR WLAN STANDARD (original) (raw)
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Orthogonal Frequency Division Multiplexing (OFDM) is predicted to be implemented in future broadcasting and Wireless Local Area Network (WLAN) systems due to its robustness in transmitting a high data rate. With the rapid growth of digital communication in recent years, the need for high speed data transmission is increased . OFDM is a promising solution for achieving high data rates in mobile environment, due to its resistance to ISI, which is a common problem found in high speed data communication. A multiple - input multiple - output (MIMO) communication System combined with t he orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable high data rate transmission over broadband wireless channels. In this paper explains the performance of MIMO OFDM under the AWGN Channel, Rayleigh channel, Ricia n Channel and Nakagami Channel also it uses different guard interval with modulation schemes as 4 - QAM, 8 - QAM, 16 - QAM ad 32 - QAM. It shows that by using OFDM with MIMO, The performance of MIMO - OFDM is evaluated on the basis of Bit Error Rate (BER).
Performance of MIMO-OFDM Transmission System on Wireless Networks
A detailed study of the performance of MIMO-OFDM transmission on WLAN physical layer specified in IEEE 802.11n, Wi-MAX (IEEE 802.16-2009) physical layer specified in 802.16 and LTE downlink physical channel (PDSCH) has been carried out using MATLAB Simulink. The WLAN and Wi-MAX system incorporates Convolution coding with 1/2 and 2⁄3 rated codes. The LTE incorporates Turbo coding with 1/2 and 2/3 rated codes. Orthogonal Frequency Division Multiple (OFDM) accesses uses adaptive modulation technique such as QPSK,16-QAM and 64-QAM, on the physical layer of WLAN, Wi-MAX and LTE and the concept of cyclic prefix that adds additional bits at the transmitter end. The Error Rate (BER) derived from simulation results show that the implementation with interleaved Convolution coding and Turbo coding under QPSK modulation technique is found to be highly efficient for WLAN, Wi-MAX and LTE wireless network system. The Implementation of MIMO–OFDM multiplexing on WLAN networks with QPSK modulation at BER ~10-3 dB, exhibits significant improvement in SNR ~ 2.75 dB, Wi-MAX network SNR ~ 3.75 dB and LTE network SNR ~7.55 dB. The improvement of SNR ~4.8 dB displayed between the MIMO-OFDM implementation on WLAN and LTE network can be attributed to the Turbo coding techniques adopted in LTE networks. Keywords-Multiple Input Multiple Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), Phase Shift Keying (PSK), Quadrature Amplitude modulation (QAM), Bit Error Rate (BER), Signal to Noise Ratio (SNR), Line-of-Sight (LoS), Forward Error Correction (FEC), Wireless Local Area Network (WLAN), Worldwide interoperability for Microwave Access (Wi-MAX), Long Term Evaluation (LTE), Subscriber Station (SS), Base Station (BS).
Performance Analysis of MIMO-OFDM based IEEE 802.11n using Different Modulation Techniques
OFDM is a most popular method that used for high data rate in wireless communication. In OFDM combined with antenna arrays at transmitter and receiver side is called MIMO-OFDM and other word MIMO-OFDM system is a consist or combination of the MIMO technique and OFDM technique that use due to increase the diversity gain, time-variant, frequency-selective channels, enhance the system capacity and improve the link reliability high data rate transmission that used for future broadband wireless communication and that are mostly use for avoid Inter-Symbol Interference (ISI) and Inter-Carrier-Interference (ICI). This paper explores physical layer research with IEEE 802.11n standard challenges with different modulation techniques and finds the BER (bit error rate) modulation techniques (BPSK, QPSK, and 712-qam). IEEE 802.11n is a communication standard that provides higher significant throughput and higher date rate. Keywords: Binary Phase Shift Keying (BPSK), multiple-input-multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), Bit error rate (BER), Additive White Gaussian Noise (AWGN), QAM (Quadrature amplitude modulation) _______________________________________________________________________________________________________
TRANSMISSION AND RECEPTION OF DATA IN MIMO-OFDM SYSTEM USING BPSK/16-QAM TECHNIQUE
In this paper, we analyze both performance and transmission-reception process in MIMO-OFDM system for wireless communication. Multiple Input Multiple Output (MIMO) configurations provide enhanced capacity and high data rates in the same transmit power for any system. Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier technique that divides high data carriers in to sub channels, to achieve high spectral efficiency. MIMOOFDM configuration is found to perform better against multi-path fading and the varying channel conditions, interferences, than the conventional technologies. Here the channel estimation & BER performance of a MIMOOFDM are evaluated and simulated using MATLAB code word on the basis of error reduction, modulation mapping and better system designing using popular IFFT/FFT & 16-QAM modulation formats.
Mimo and OFDM in Wireless Communication
—In day to day life the need of usage of bandwidth has become very expensive. There should be a solution which will give us the maximum usage of bandwidth with less cost and maximum efficiency. The solution is to implement MIMO and OFDM in wireless communication. The combination of MIMO and OFDM with 802.11n wireless LAN implemented on FPGA gives the better performance in terms of speed. This paper includes necessity of MIMO and OFDM in wireless communication and the model designed using MIMO and OFDM in MATLAB simulink and implemented on FPGA.
MIMO-OFDM (Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing) system has been recognized as one of the most popular and competitive technique in a wireless environment nowadays. The performance is calculated in terms of Bit Error Rate (BER) versus the Signal to Noise Ratio (SNR). In this paper we discuss the BER performance of the MIMO-OFDM system with two different equalizers (ZF and MMSE) for various modulation techniques i.e. BPSK, QPSK, 16-QAM and 64-QAM using multipath fading channels i.e. AWGN (Additive White Gaussian Noise), Rayleigh and Rician channel. The multicarrier modulation is employed, which gives advantages like inter symbol interference (ISI) reduction, high data rate, higher reliability, and better performance in multipath fading. The simulation results show that, with MMSE and ZF equalizers, the BER performances is better in MMSE equalizer. Further we analyzed in different fading channels for various modulation techniques in both the equalizers.
A Survey on OFDM and IEEE WLAN Standard
International Journal of Computer Applications, 2013
In the today’s multimedia communication scenario, the demand for high data rate, reliable, high quality digital data increased quickly. Due to the high data rate transmission and the capability to reduce the frequency selective fading into flat fading by separating the available spectra into multiple subcarriers, orthogonal frequency division multiplexing (OFDM) is a promising technique in the current broadband wireless communication system. This paper gives the progress of orthogonal frequency division multiplexing form historical aspect. All over the world OFDM is of the great interest by researchers and research laboratories which contributes the use of DFT, addition of cyclic prefix to remove the intersymbol interference and pilot insertion to reduce interference from multipath and co-channels. OFDM is not only used in cellular environment but also for LAN standard 802.11a/b/g/n. Also this paper will survey on the landscape of the IEEE 802.11 standard and give an overview of var...
Design and prototype development of MIMO-OFDM for next generation wireless LAN
IEEE Transactions on Consumer Electronics, 2005
Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) is regarded as a promising technology enabling higher data rate wireless communications in frequency selective fading channels. This paper proposes the next generation wireless local area network (WLAN) physical (PHY) layer transmission technology using dual-band and MIMO-OFDM schemes and discusses test results of MIMO-OFDM prototype system implemented with field programmable gate arrays (FPGA). This design targets over 200Mbps of the maximum PHY data rate in 40MHz bandwidth and compatibility with the legacy IEEE 802.11a. For a cost-effective implementation and improved packet error rate (PER) performance, 2 transmit and 3 receive antennas and 40MHz channel are used to achieve the desired PER and throughput performance in the 5GHz band 1 .
Analysis the Performance of OFDM Using BPSK, QPSK, 64-QAM, 128-QAM & 256-QAM Modulation Techniques
Journal of Electrical Engineering, Electronics, Control and Computer Science, 2021
At the present era of communication technology, every user wants a communication system that has higher data transmission capability and reliability. Orthogonal Frequency Division Multiplexing (OFDM) is a frequency division multiplexed multi carrier transmission method and each multiplexed signal is orthogonal to each other. This technology is known as core technology of the new generation wireless mobile communication systems. This technology has higher data transmission capability and reliability as well as has the ability to combat frequency selective fading or narrowband interference while maintaining high spectrum utilization. The aim of this paper is to analyze the performance of the OFDM technology using different modulation techniques. This paper is mainly focused on the calculation of the Bit Error Rate (BER) to analyze the performance of OFDM systems. In this paper, we considered BPSK, QPSK, 64-QAM, 128-QAM and 256-QAM modulation techniques. All the simulations has been accomplished by using the MATLAB framework.
A REVIEW PAPER ON PERFORMANCE ANALYSIS OF MIMO BASED OFDMA SYSTEM UNDER FADING CHANNEL
In communication systems, Multiple input Multiple output (MIMO) antenna systems with orthogonal frequency division multiple acess (OFDMA) is the most promising combination of technologies for high data rate services in next generation wireless networks. In MIMO systems, multiple antennas are used in both transmitter and receiver to improve the communication performance, whereas the orthogonal frequency division multiple acess (OFDMA) is a multicarrier multiple acess method. MIMO-OFDMA is commonly used for communication systems due to its high transmission rates and robustness against multipath fading. Performance assessment of multi-cell systems based on these technologies is of crucial importance in the deployment of broadband wireless standards such as WiMAX and 3GPP, LTE. This paper presents a vivid view of recent trends and developments in Orthogonal Frequency Division Multiple Access (OFDMA). In this paper we will discuss the basics of OFDM techniques, role of OFDM in this era, its benefits and losses and also some of its application. This paper discusses the structure and implementation of an OFDMA modem employed in wireless communication. Orthogonal rate of recurrence Division Multiplexing (OFDM) is just about the latest modulation techniques used so that you can combat the frequency-selectivity from the transmission channels, achieving substantial data rate without inter-symbol disturbance. In this paper, we present a study of various interference effects in a MIMO-OFDMA system and their compensation techniques. In this paper, we present a comprehensive survey on MIMO OFDMA for wireless communications.