期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2017
卷号：6
期号：12
页码：22295
DOI：10.15680/IJIRSET.2017.0612009
出版社：S&S Publications
摘要：The frequency spectrum is an expensive resource limiting the bandwidth. To achieve high speed (10-6),data rate (1Gbps) and simultaneous increase in range and reliability without consuming extra radio frequency (3 KHz-300GHz) requires enhanced spectral efficiency in order to increase link throughput, to meet QOS, and network capacity.So to fulfil these requirements the MIMO-OFDM system for wireless broadband communication is used.In wireless transmission, bit error rate detoriates over wireless transmission, the reductionof a data channel andthecorresponding (BER) bit error rate is noise and changes to thepropagation path. In OFDM transmissions system a termcalled peak-to-average power ratio(PAPR), arises which result in corresponding distortion when signal gets transmittedthrough a nonlinear nature device, such as a power amplifier use at transmitter stage.The limitations of OFDM signals are that, the OFDM signals are more immune to the time-varying channel, whichbreaks the orthogonally between sub-carriers, causes the generation of inter-channel interference (ICI).It is seen thatonce the symbols are transmitted in the radio fading channel, then the transmitted signal will suffer deep fades that giverise to loss of signal or outage of signal.Outage probability is a performance measure of MIMO system. The outage probability is a measure of the quality ofthe transmission in a mobile radio channel. Outage arises when the received signals goes below a given threshold level.Like (0.1% or 0.5%).There is criteria to increase the BER beyond 10-5 using 8X8 MIMO system or higher, to achievethe data rate of 1Gbps..To improve all these parameters, a orthogonal frequency division multiplexing with indexmodulation (OFDM-IM) technique is used for frequency selective fading channels. The information is conveyed notonly by M-ary signal constellations as in classical OFDM, but also by the indices of the subcarriers, which are activatedaccording to the incoming bit stream.The paper deals with measurement/analysis of parameters such as BER, SNR, outage capacity, for (4X4,8X8) MIMOsystem using QPSK,16-QAM, to improve BER beyond 10-5. It is observed via computer simulations that the proposedMIMO-OFDM-IM scheme achieves significantly better error performance up to 10-5 than classical MIMO-OFDMusing QPSK, 16-QAM for several (2X2,4X4,8X8) system configurations due to the information bits carried in thespatial domain by the indices of OFDM subcarriers.
