Digital Modulation Schemes Employed in Wireless Communication: A Literature review

Manoj Barnela


Wireless communications has become an emerging and fastly growing field in our modern life and creates enormous impact on nearly every feature of our daily life. A tremendous technological transformation during the previous two decades has provided a potential growth in the field of digital communication and lot of latest applications and technologies are coming up every day due to these valid reasons. Digital modulation schemes contribute to the evolution of mobile communications by increasing the capacity, speed as well as the quality of the wireless network. In communication, the concept of modulation is a prime factor  because without an appropriate modulation scheme, it would be impossible to achieve an expected throughput. Available bandwidth, permissible power and inherent noise level of the system are the constraints which should be considered while developing the communication systems. Due to error-free capability in digital  modulation, it is preferred over the analogue modulation techniques. The Worldwide interoperability for Microwave Access (Wi-max) uses combinations of  different modulation schemes which are BPSK, QPSK , 4-QAM AND 16-QAM and it is a promising technology which offers high speed voice, video and data services. In this paper the literature review on the different digital modulation techniques which are generally used for the wireless communication is presented.


Digital Modulation, BASK, BFSK, BPSK, DPSK, QAM, OQPSK, MSK, GMSK, Power efficiency, Spectral efficiency, Bandwidth efficiency, Bit error rate

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