tailieunhanh - Báo cáo hóa học: "A novel code-based iterative PIC scheme for multirate CI/MC-CDMA communication"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : A novel code-based iterative PIC scheme for multirate CI/MC-CDMA communication | Mukherjee and Kumar EURASIP Journal on Wireless Communications and Networking 2011 201 1 155 O EURASIP Journal on http content 2011 1 155 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access A novel code-based iterative PIC scheme for multirate CI MC-CDMA communication Mithun Mukherjee and Preetam Kumar Abstract This paper introduces a novel code-based iterative parallel interference cancellation technique Code-PIC for the multirate carrier interferometry multicarrier code division multiple-access CI MC-CDMA system which supports simultaneous transmission of high and low data rate users. In Code-PIC scheme multiple-access interference MAI for the desired user is estimated based on the projection of subcarrier and subsequent removal of interference from the received signal depending on specific high or low data rate users. Carrier interferometry CI codes are used to minimize the cross-correlation between users which significantly reduces the multiple-access interference MAI for the desired user. The effect of MAI in CI MC-CDMA is reduced by giving proper phase shift to different set of users. Improved estimation of MAI in Code-PIC results in lower residual interference after interference cancellation. Simulation results show that Code-PIC scheme offers improved BER performance over AWGN and Rayleigh fading channels compared to Block-PIC and Sub-PIC with reduced latency and complexity. 1 Introduction Multicarrier code division multiple-access MC-CDMA system is a promising technique for high-speed communication system due to robustness against intersymbol interference ISI over multipath. The capacity of CDMA in cellular and wireless personal communication systems is limited by multiple-access interference MAI due to simultaneous transmission of more than one user. The interference power increases linearly with the number of simultaneous users. To alleviate MAI several multiuser detection schemes have been proposed

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