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This paper considers spatially coupled repeat-accumulate (SC-RA) coded interleave-division multiple-access (IDMA) systems with segmented interleavers. Each user employs an SC-RA encoder and a spreader followed by user-specific segmented interleavers. Each segment corresponds with a parity variable node in the SC-RA code's protograph. Since all the users' parity bits at the ends of the coupling positions...
A form of spatially coupled codes is obtained by coupling multiple identical concatenated codes consisting of a block outer code (a repetition code followed by a single-parity code) concatenated with a convolutional inner code of infinite impulse response. The coupling operation involves only the outer code of the block-convolutional concatenated code. Because of the simple outer code and diverse...
A multi-layer corrugated circular-aperture terahertz (THz) horn antenna based on MEMS (Micro-electromechanical System) technology is presented in this paper. The proposed antenna reveals bandwidth for return loss below −13 dB from 470 GHz to 530 GHz. The radiation pattern exhibits symmetric beam and very low cross-polarization. The peak gain varies from 18.9 dBi to 20.2 dBi within the frequency band...
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