Transmit Power Allocation for Successive Interference Cancellation in Multicode MIMO Systems

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dc.contributor.authorPark, Chang Soon-
dc.contributor.authorLee, Kwang Bok-
dc.identifier.citationIEEE Trans. Commun., vol. 56, pp. 2200-2213, Dec. 2008en
dc.descriptionPaper approved by X. Wang, the Editor for Multiuser Detection and Equalization of the IEEE Communications Society. Manuscript received June 10, 2005; revised November 2, 2006 and July 23, 2007. This paper was presented in part at the IEEE International Conference on Communications, Seoul, Korea, May 2005.en
dc.description.abstractMultiple-input multiple-output (MIMO) system with multicode transmission can provide high speed data services by transmitting independent parallel substreams from multiple antennas and through multicode channelization. In this paper, we first introduce an iterative two-stage successive interference cancellation (SIC) detection scheme for a multicode MIMO system. The proposed technique cancels the interference signals successively in the space domain followed by the code domain. Next, we develop various transmit power allocation schemes over different data substreams for the proposed detection process to improve error rate performance. The joint transmit power allocation is derived to make the post-detection signal-to-interferenceplus- noise ratio (SINR) become the same for all substreams in both the space and code domains. As a computationally efficient scheme, we propose a two-stage power allocation scheme, which allocates the total transmit power to the substreams in the code domain at the first stage, and allocates this code domain power to the substreams in the space domain at the second stage. Furthermore, variable and constant power ratio (PR) schemes are derived to reduce the feedback overhead. In particular, the constant PR scheme utilizes the transmit power ratio determined by the long-term statistical properties of the fading channel amplitudes, and achieves significantly reduced feedback rate. Numerical results show that the proposed transmit power allocation schemes for the two-stage SIC significantly outperform the equal power allocation scheme.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.subjectBit error rate (BER)en
dc.subjectmulticode transmissionen
dc.subjectmultiple-input multiple-output (MIMO) systemsen
dc.subjectsuccessive interferenceen
dc.subjecttransmit power allocationen
dc.titleTransmit Power Allocation for Successive Interference Cancellation in Multicode MIMO Systemsen
dc.typeConference Paperen
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Others_전기·정보공학부
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