Title :
Iterative channel estimation using soft decision feedback
Author :
Sandell, Magnus ; Luschi, Carlo ; Strauch, Paul ; Yan, Ran
Author_Institution :
Lucent Technol., AT&T Bell Labs., Swindon, UK
Abstract :
We present an iterative channel estimation scheme with soft decision feedback. In a block-by-block transmission system with a soft-output equalizer and/or decoder it is possible to feed back the decisions to the channel estimator to improve its performance. We propose to feed back soft decisions which will reduce error propagation. We also derive a suboptimal estimator with substantially lower complexity and present simulations for a GSM-like system. The improvement of the bit-error rate over non-iterative schemes with this low complexity estimator is about 0.8 dB (equalizer feedback) and 1.5 dB (decoder feedback)
Keywords :
cellular radio; decision feedback equalisers; decoding; error statistics; intersymbol interference; iterative methods; mean square error methods; optimisation; telecommunication channels; GSM-like system; ISI; bit-error rate; block-by-block transmission system; decoder feedback; equalizer feedback; error propagation reduction; intersymbol interference; iterative channel estimation; least square estimate; low complexity estimator; noniterative schemes; optimal channel estimator; performance; simulations; soft decision feedback; soft-output equalizer; suboptimal estimator; Bit error rate; Channel estimation; Detectors; Equalizers; Feedback; Feeds; Impedance; Intersymbol interference; Iterative decoding; Radio access networks;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.776006
