• Divya Kumari
• Dr. Bharti Chourasia

Multiple-input multiple-output (MIMO)wireless technology in combination with orthogonal frequency division multiplexing (MIMO-OFDM) is an attractive air-interface solution for next-generation wireless communication systems. It can increase capacity of system and/or it is possible to have more reliable transmission using MIMO technology. This technique of using multiple antennas at both ends in communication system can be combined with OFDM to achieve spectral efficiency as well as reliability. The modulation technique is a key approach for long distance data transmission. The use of higher-order modulation provides the possibility for higher bandwidth utilization, that is, the possibility to provide higher data rates within a given bandwidth. However, the higher bandwidth utilization comes at the cost of reduced robustness to noise and interference. Alternatively expressed, higher-order modulation schemes, such as 16-QAM or 64-QAM, require a higher Eb/N0 at the receiver for a given bit error probability, compared to other digital modulation technique such as QPSK. This paper reviews about the various digital modulation techniques for higher order.

MIMO-OFDM, Modulation order, Wireless, QAM

"Review for OFDM-MIMO Wireless Communication System for Different Modulation Technique", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 9, page no.345-347, September-2020, Available :http://www.jetir.org/papers/JETIR2009349.pdf

"Review for OFDM-MIMO Wireless Communication System for Different Modulation Technique", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 9, page no. pp345-347, September-2020, Available at : http://www.jetir.org/papers/JETIR2009349.pdf