A Novel Hybrid Multiple Access Scheme in Downlink for 4G Wireless Communications
International Journal of Wireless Communications and Mobile Computing
Volume 1, Issue 4, November 2013, Pages: 103-112
Received: Jul. 18, 2013; Published: Oct. 30, 2013
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Authors
Poonam Singh, Electronics & Comm. Engg. Dept., National Institute of Technology, Rourkela, India
Saswat Chakrabarti, GSSST, Indian Institute of Technology, Kharagpur, India
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Abstract
In this paper, we present a hybrid multiple access scheme to increase the data rate and to provide more flexibility for 4G wireless communications. The proposed scheme utilizes a combination of the multiple access techniques TDMA, CDMA and OFDMA. It uses variable time slots, spreading factors and number of subcarriers to provide flexible data rates for different classes of users. The performance analysis of the proposed scheme is carried out for different modulation schemes used in downlink and expressions for multiple access interference (MAI) and bit error rate (BER) are derived. The parameters for this scheme are selected depending on available bandwidth, required data rates, number of users, type of service provided etc. It is found that this scheme provides better scalability and can support more number of users.
Keywords
Multiple Access Scheme, FDMA, TDMA, CDMA, OFDMA
To cite this article
Poonam Singh, Saswat Chakrabarti, A Novel Hybrid Multiple Access Scheme in Downlink for 4G Wireless Communications, International Journal of Wireless Communications and Mobile Computing. Vol. 1, No. 4, 2013, pp. 103-112. doi: 10.11648/j.wcmc.20130104.14
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