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Analysis of subcarrier and antenna power allocation for MIMO WPMCM system with sphere decoder

Publication Type : Journal Article

Publisher : WSEAS Transactions on Communications

Source : WSEAS Transactions on Communications, Volume 11, Number 3, p.113-123 (2012)

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Keywords : Antennas, Available bandwidth, Carrier frequency offsets, Conventional power, Cyclic Prefix, Equal power allocation, Frequency synchronization, Intersymbol interference, Lagrange multipliers, Lagrangian methods, MIMO systems, MIMO-WPMCM, Multi-output, Orthogonal carriers, Orthogonal frequency division multiplexing, Orthogonal frequency division multiplexing (OFDM), Power allocations, Real-time application, Sphere decoder, Sphere decoders, Sub-carrier allocation, Sub-carrier power, Subcarrier, Subcarrier and power allocation, Total power, Wireless environment

Campus : Coimbatore

School : School of Engineering

Department : Electronics and Communication

Year : 2012

Abstract : In order to achieve the efficient usage of the available bandwidth in wireless environments, the best method for real time application would be combining Multi- Input Multi-Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) together. The OFDM implemented by using IFFT's and FFT's have major drawbacks like ISI (intersymbol interference), Time and Frequency Synchronization and Carrier Frequency Offset. To alleviate the above problems wavelet transform is used to generate the orthogonal carrier. This paper investigates joint subcarrier and antenna power allocation in WPMCM system. The transmit (antenna) power is allocated for the proposed combination using the Lagrangian method and compared with the conventional power allocation scheme. Existing sub-optimal techniques either use equal power allocation and perform only subcarrier allocation or handle subcarrier and power allocation separately. In this paper, we propose an algorithm that performs joint subcarrier and power allocation to reduce the BER under a total power constraint.

Cite this Research Publication : Ra Deepa and Baskaran, Kb, “Analysis of subcarrier and antenna power allocation for MIMO WPMCM system with sphere decoder”, WSEAS Transactions on Communications, vol. 11, pp. 113-123, 2012.

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