Applying LDPC Codes to the GPRS

Conference: European Wireless 2006 - 12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia Communications
04/02/2006 - 04/05/2006 at Athens, Greece

Proceedings: European Wireless 2006

Pages: 7Language: englishTyp: PDF

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Keyrouz, Fakheredine; Xu, Wen; Gasiba, Tiago (BenQ Mobile, Heidenauplatz 1, D-81667 Munich, Germany)
Keyrouz, Fakheredine (Munich University of Technology, Arcisstr. 21, D-80333 Munich, Germany)

For GPRS the well-known convolutional code is currently used as a Forward Error Correction (FEC) mechanism, and the Viterbi algorithm for decoding. With the recent introduction of Multimedia Broadcast Multicast Services (MBMS), new applications that require more bandwidth and reliability are foreseen. It is known that the current GPRS system does not perform well enough without further modifications, therefore, more efficient information distribution schemes need to be considered. To meet these increased requirements, especially for MBMS, we study the introduction of carefully designed LDPC codes at the physical layer. To exploit the full benefit of the superior performance of LDPC codes for longer streams in MBMS, a modification in the GPRS protocol stack is proposed where larger RLC/MAC blocks are allowed, and its impact on the existing GPRS protocol stack is minimized.