Bit-interleaved low density spread (BI-LDS) transmission

Achieving higher aggregate data rates for many simultaneous users is considered as a fundamental challenge for the next generation of wireless systems. With low-density spreading (LDS), one could transmit information by overloading, i.e., using more spreading sequences than chips with reasonable imp...

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Bibliographic Details
Published in2014 IEEE Wireless Communications and Networking Conference (WCNC) pp. 677 - 682
Main Authors Popovic, Branislav M., Safavi, Anahid Robert, Perotti, Alberto G.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.04.2014
Subjects
Convolutional codes
Decoding
Error correction codes
Modulation
Receivers
Transmitters
Turbo codes
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Summary:Achieving higher aggregate data rates for many simultaneous users is considered as a fundamental challenge for the next generation of wireless systems. With low-density spreading (LDS), one could transmit information by overloading, i.e., using more spreading sequences than chips with reasonable implementation complexity. In this paper, we propose an improvement to the conventional LDS technique that consists in introducing a bit interleaver in the transmission scheme. Its role is to render the error bursts that appear at the output of the LDS detector into correctable patterns for the channel decoder. Numerical evaluations of the spectral efficiency show SNR improvements of more than 2dB when using convolutional codes in BI-LDS schemes. Slight improvements are also observed when turbo codes are employed.
ISSN:1525-3511
1558-2612
DOI:10.1109/WCNC.2014.6952129