Performance Analysis of MIMO-CDMA System (original) (raw)
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Performance Estimation of 2*2 MIMO-MC-CDMA using Different Modulation Technique
2014
In this paper we estimate the performance of MIMO-MC-CDMA system in Rayleigh fading environment in QPSK, 8-PSK, 8-QAM, 16-QAM, 32-QAM and 64-QAM modulation technique using MATLAB this technique is highly optimized in 3G and 4G wireless communication system to reducing BER. CDMA (Code Division for Multiple Access) is a multiuser system also called as spread spectrum system for which spreading of sequence is done by using PN (Pseudo-random Noise) sequence generator at the transmitter. This system then combined with OFDM (Orthogonal Frequency Division Multiplexing) which is multicarrier system in which single broadband frequency selective carrier is converted into parallel narrowband flat fading multiple subcarriers to optimize the performance of system which forms MC-CDMA (multi-carrier-Code Division Multiple Access) system. Now this system further improved by combination of 2*2 MIMO (Multiple Input Multiple Output) system contains 2 tranmit antennas and two receive antenna which utilizes ZF (Zero Forcing) decoder at the receiver to reduce BER and also ½ rate convolutionally encoded Alamouti STBC (Space Time Block Code) block code as transmit diversity of MIMO for multiple transmission of data through multiple transmit antenna. By using MIMO-OFDM [7] combination remove the probability of ISI at the transmitter without using ZF equalizer. Resultant system with the combination of OFDM-CDMA and MIMO-OFDM gives MIMO-MC-CDMA which is optimized system for 3G and 4G wireless communication system. Now after forming MIMO-MC-CDMA using MATLAB [3] we analyze system performance in above mentioned modulation schemes in Rayleigh fading channel.
IJERT-Performance Estimation of 2*2 MIMO-MC-CDMA using Different Modulation Technique
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/performance-estimation-of-22-mimo-mc-cdma-using-different-modulation-technique https://www.ijert.org/research/performance-estimation-of-22-mimo-mc-cdma-using-different-modulation-technique-IJERTV3IS10883.pdf In this paper we estimate the performance of MIMO-MC-CDMA system in Rayleigh fading environment in QPSK, 8-PSK, 8-QAM, 16-QAM, 32-QAM and 64-QAM modulation technique using MATLAB this technique is highly optimized in 3G and 4G wireless communication system to reducing BER. CDMA (Code Division for Multiple Access) is a multiuser system also called as spread spectrum system for which spreading of sequence is done by using PN (Pseudo-random Noise) sequence generator at the transmitter. This system then combined with OFDM (Orthogonal Frequency Division Multiplexing) which is multi-carrier system in which single broadband frequency selective carrier is converted into parallel narrowband flat fading multiple sub-carriers to optimize the performance of system which forms MC-CDMA (multi-carrier-Code Division Multiple Access) system. Now this system further improved by combination of 2*2 MIMO (Multiple Input Multiple Output) system contains 2 tranmit antennas and two receive antenna which utilizes ZF (Zero Forcing) decoder at the receiver to reduce BER and also ½ rate convolutionally encoded Alamouti STBC (Space Time Block Code) block code as transmit diversity of MIMO for multiple transmission of data through multiple transmit antenna. By using MIMO-OFDM [7] combination remove the probability of ISI at the transmitter without using ZF equalizer. Resultant system with the combination of OFDM-CDMA and MIMO-OFDM gives MIMO-MC-CDMA which is optimized system for 3G and 4G wireless communication system. Now after forming MIMO-MC-CDMA using MATLAB [3] we analyze system performance in above mentioned modulation schemes in Rayleigh fading channel.
Performance Estimation of 2*3 MIMO-MC-CDMA in Rayleigh Fading Channel
International Journal of Computer Trends and Technology, 2014
In this paper we analyze the performance of 2*3 MIMO-MC-CDMA system in MATLAB which greatly reduces BER by increasing the efficiency of system. MIMO and MC-CDMA system arrangement is used to decrease bit error rate and also figure a new system called MC-CDMA which is multiple user and multiple access system used to enhance the performance of the system. MC-CDMA is a narrowband flat fading in character which changes frequency selective to several narrowband flat fading multiple parallel sub-carriers to enhance the effectiveness of the system. Now this MC-CDMA further improved by grouping by 2*3 MIMO system which make use of ZF decoder at the receiver to reduce BER in which half-rate convolutional encoded Alamouti's STBC block code is intended for channel encoding as transmit diversity for MIMO with multiple transmit and receive antennas. Main improvement of using MIMO-MC-CDMA is for reducing complication of system and also for dropping BER and finally increasing gain of the system. Then we estimate the system in different modulation techniques like, 64-QAM, 8-PSK, 16-QAM, QPSK, 32-QAM and 8-QAM using MATLAB in Rayleigh fading channel.
Performance Estimation of 2*3 MIMO-MC-CDMA using Convolution Code
International Journal of Computer Trends and Technology, 2014
In this paper we estimate the performance of 2*3 MIMO-MC-CDMA system using convolution code in MATLAB which highly reduces BER by increasing the efficiency of system. MIMO and MC-CDMA system combination is used to reduce bit error rate and also for forming a new system called MC-CDMA which is multi user and multiple access schemes used to increase the performance of the system. MC-CDMA system is a narrowband flat fading in nature which converts frequency selective to numerous narrowband flat fading multiple parallel sub-carriers to increase the efficiency of the system. Now this MC-CDMA system can also be enhanced by grouping with 2*3 MIMO system which utilizes ZF decoder at the receiver to decrease BER in which ½ rate convolutionally encoded Alamouti STBC block code is used for channel encoding scheme as transmit diversity of MIMO with multiple transmit antenna. And convolution encoder is also used as source encoder or FEC encoder in MIMO-MC-CDMA. Advantage of using MIMO-MC-CDMA using convolution code is due to reduce complexity of system and also for reducing BER and finally to increase gain of system. Now after this we examine system in various modulation techniques like, 8-PSK, 16-QAM, QPSK, 32-QAM, 8-QAM and 64-QAM using MATLAB in Rayleigh fading channel.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/performance-estimation-of-22-mimo-mc-cdma-using-convolution-code-in-different-modulation-technique https://www.ijert.org/research/performance-estimation-of-22-mimo-mc-cdma-using-convolution-code-in-different-modulation-technique-IJERTV3IS10881.pdf In this paper we estimate the performance of 2*2 MIMO-MC-CDMA system using convolution code in MATLAB which highly optimizes 3G and 4G wireless communication system by reducing BER. CDMA (Code Division for Multiple Access) is a multiuser system or spread spectrum system for which spreading of sequence is done by PN(Pseudo-random Noise) sequence generator at the transmitter and convolution encoding scheme is used in encoder of CDMA as FEC (Forward Error Correction) code to reduce BER (Bit Error Rate). Now this system is combined with OFDM (Orthogonal Frequency Division Multiplexing) which is multi-carrier system in which single broadband frequency selective carrier is converted into parallel narrowband flat fading multiple sub-carriers to optimize the performance of system. This combination of system called MC-CDMA (multi-carrier-Code Division Multiple Access) system. Now this system further improved by combination of 2*2 MIMO (Multiple Input Multiple Output) system which utilizes ZF (Zero Forcing) decoder at the receiver to reduce BER and also ½ rate convolutionally encoded Alamouti STBC (Space Time Block Code) block code as transmit diversity of MIMO for multiple transmission of data through multiple transmit antenna. By using MIMO-OFDM [3] ZF equalizer at transmitter is not required because MIMO-OFDM combination remove the probability of ISI at the transmitter. Resultant system with the combination of OFDM-CDMA and MIMO-OFDM forms MIMO-MC-CDMA which is highly optimized system for 3G and 4G wireless communication system. Now after forming MIMO-MC-CDMA using convolution code in MATLAB [1] we analyze system performance in different modulation schemes like, QPSK, 8-PSK, 8-QAM, 16-QAM, 32-QAM and 64-QAM in Rayleigh fading channel.
. Performance Improvement of MIMO MC-CDMA System Using Relay and ITBF
In the wireless communication the Inter Symbol Interference (ISI) is a major barrier caused by multipath fading which has a strong negative impact on Bit Error Rate (BER) and affects the high speed data transmission over the wireless channel. Methods: The equalization and channel estimation techniques are available at the receiver (Rx) to reduce the ISI when the channel is affected by multipath propagation effect. Further to decrease the influence of ISI or to improve the quality of the channel condition from the transmitter (Tx), it is reliable to use Relay with Beam-Form (BF) technique because ISI is related to a channel's spatial property. It is natural to expect BF techniques which are often deployed in Multiple Input Multiple Output (MIMO) systems that help to enhance the performance of the system. Findings: In this model, the half duplex Relaying is provided with MIMO antennas with the Amplify and Forward (AF) Relaying protocol. To reduce the ISI and error rate, this study proposes Improved Transmit Beam-Form (ITBF) with equalizationandRelay to be employed with MIMO Multi-Carrier Code Division Multiple Access (MC-CDMA) system. Application: Simulation result depicts the proposed system with ITBF and Relaying is highly reliable to achieve high speed data transmission. system in rich fading and multipath propagation environment by providing spatial diversity. In addition, the MIMO antenna system increases the capacity linearly with the number of transmits-receive antenna pairs without increasing bandwidth and transmitted power. Similarly Orthogonal Frequency Division Multiplexing (OFDM) enables the maximum use of the available bandwidth by designing sub carrier orthogonal to each other. Moreover both of these two techniques are not satisfactory for fast fading environment. To improve the wireless communication quality, the spread spectrum, OFDM and MIMO are combined together which would work on the fast fading environments with reasonable computation complexity.
Performance Analysis of DS-Cdma System Over Awgn and Fading Channels Based on Diversity Scheme
2013
This paper investigates, a technique which uses antenna diversity to achieve full transmit diversity using an arbitrary number of transmit antennas for secure communications and to improve the system performance by mitigating interference. The work is focused on the performance of DS-CDMA systems over Rayleigh, Rician and AWGN fading channel, in the case of the channel being known at the receiver .The diversity scheme used in the analysis is Alamouti STBC scheme. Using simulation and analytical approach, we show that STBC CDMA system has increased performance in cellular networks We also compare the performance of this system with the typical DS-CDMA system and show that STBC and multiple transmit antennas for DSCDMA system provide performance gain without any need of extra processing . Evaluation and comparison of the performances of DS-CDMA system in the AWGN (Additive White Gaussian Noise) channel, Rician fading channel and the Rayleigh fading channel are provided.
Simulation and Analysis of MC-CDMA System under AWGN and Rayleigh Fading Channel
INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY, 2013
This paper presents a detailed analysis of Multicarrier Code Division Multiple Access (MC-CDMA) system over Additive White Gaussian Noise (AWGN) and Rayleigh Fading Channel with analysisof the effects of different number of sub-carriers and multiuser scenarios and at the end a comparison with standard technique is also performed. The complete analysis is performed by simulating the mathematical model of the MC-CDMA system with various combinations of sub-carriers, number of users, SNR, path gains and path delays etc. the simulation results shows that the MC-CDMA is an effective way to overcome the multipath fading losses and spectrum utilization with relatively simple system architecture.
Study and Simulation of DS-CDMA over Communication Channels
2014
Performance of synchronous DS-CDMA systems over multipath fading channel and AWGN Channel is evaluated. The synchronous DS-CDMA system is well known for eliminating the effects of multiple access interference which limits the capacity and degrades the BER performance of the system. This paper investigated the bit error rate (BER) performance of a synchronous DS-CDMA system over AWGN and Rayleigh channel, which is affected by the different number of users, as well as different types spreading codes. The promising simulation results explore the comparative study of different DS-CDMA system parameter and showed the possibility of applying this system to the wideband channel. In this paper, Rayleigh channel and AWGN Channel are introduced and investigated the bit error rate (BER) performance of a synchronous DS-CDMA system over these channels. In the DS-CDMA system, the narrowband message signal is multiplied by a large bandwidth signal, which is called the spreading of a signal. The spreading signal is generated by convolving a GOLD sequence code with a chip waveform whose duration is much smaller than the symbol duration.