Title :
Luby Transform Coding Aided Iterative Detection for Downlink SDMA Systems
Author :
Wei, C.Y. ; Nguyen, T.D. ; Wu, N. ; Akhtman, J. ; Yang, L.-L. ; Hanzo, L.
Author_Institution :
School of ECS., Univ. of Southampton, SO17 1BJ, UK. http://www-mobile.ecs.soton.ac.uk
Abstract :
A Luby Transform (LT) coded downlink Spatial Division Multiple Access (SDMA) system using iterative detection is proposed, which invokes a low-complexity near-Maximum-Likelihood (ML) Sphere Decoder (SD). The Ethernet-based Internet section of the transmission chain inflicts random packet erasures, which is modelled by the Binary Erasure Channel (BE), while the wireless downlink imposes both fading and noise. A novel Log-Likelihood Ratio based packet reliability meric is used for identifying the channel-decoded packets, which are likely to be error-infested. Packets having residual errors must not be passed on to the LT decoder for the sake of avoiding LT-decoding-induced error propagation. The proposed scheme is capable of maintaining an infinitesimally low packet error ratio in the downlink of the wireless Internet for Eb/N0 values in excess of about 3dB.
Keywords :
Convolution; Convolutional codes; Decoding; Downlink; Internet; MIMO; Multiaccess communication; Throughput; Transform coding; Transmitters;
Conference_Titel :
Signal Processing Systems, 2007 IEEE Workshop on
Conference_Location :
Shanghai, China
Print_ISBN :
978-1-4244-1222-8
Electronic_ISBN :
1520-6130
DOI :
10.1109/SIPS.2007.4387580