TY - GEN
T1 - Informed message update for iterative MIMO demapping and turbo decoding
AU - Zhang, Dan
AU - Lai, I. Wei
AU - Nikitopoulos, Konstantinos
AU - Ascheid, Gerd
PY - 2010
Y1 - 2010
N2 - In this paper, the iterative scheduling issue for multiple-input multiple-output (MIMO) systems with turbo codes is addressed based on the informed asynchronous scheduling, initially used for scheduling low-density parity-check (LDPC) decoding. For the iterative MIMO demapping and turbo decoding, the convergence behavior by using the informed asynchronous scheduling is first demonstrated to be similar to the standard sequential scheduling. As the extrinsic log-likelihood ratio (LLR) calculation at both the MIMO demapper and turbo decoder costs high complexity, an informed message update (IMU) rule is further proposed to select only a subset of extrinsic LLRs for updates within each iteration. By avoiding the re-calculations for the extrinsic LLRs with small changes between successive iterations, significant complexity savings are achieved with negligible error rate performance loss.
AB - In this paper, the iterative scheduling issue for multiple-input multiple-output (MIMO) systems with turbo codes is addressed based on the informed asynchronous scheduling, initially used for scheduling low-density parity-check (LDPC) decoding. For the iterative MIMO demapping and turbo decoding, the convergence behavior by using the informed asynchronous scheduling is first demonstrated to be similar to the standard sequential scheduling. As the extrinsic log-likelihood ratio (LLR) calculation at both the MIMO demapper and turbo decoder costs high complexity, an informed message update (IMU) rule is further proposed to select only a subset of extrinsic LLRs for updates within each iteration. By avoiding the re-calculations for the extrinsic LLRs with small changes between successive iterations, significant complexity savings are achieved with negligible error rate performance loss.
UR - http://www.scopus.com/inward/record.url?scp=78651307809&partnerID=8YFLogxK
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U2 - 10.1109/ISITA.2010.5649576
DO - 10.1109/ISITA.2010.5649576
M3 - Conference contribution
AN - SCOPUS:78651307809
SN - 9781424460175
T3 - ISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications
SP - 873
EP - 878
BT - ISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications
T2 - 2010 20th International Symposium on Information Theory and Its Applications, ISITA 2010 and the 2010 20th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2010
Y2 - 17 October 2010 through 20 October 2010
ER -