Sphere Constrained Block RSSE with Per-Survivor Intra-Block Processing for CCK Transmission
Jonietz C, Gerstacker W, Schober R (2008)
Publication Language: English
Publication Type: Conference contribution
Publication year: 2008
Publisher: IEEE
Event location: Bologna
ISBN: 978-1-4244-2204-3
Abstract
In the wireless local area network (WLAN) standard IEEE 802.11b, complementary code keying (CCK) modulation has been adopted for the high data rate transmission mode, which can be considered as a special type of spread spectrum modulation with data-dependent spreading. In this paper, complexity reduction for block reduced-state sequence estimation (bRSSE), tailored for CCK transmission over frequency-selective channels, is considered. A trellis diagram for the chip phases of the codewords fully describes the CCK code properties. Subset trellises are derived from the full CCK trellis diagram based on set partitioning of the multidimensional CCK code set. The CCK subset trellises connect consecutive bRSSE states in order to form a compound trellis. The Viterbi algorithm (VA) with per-survivor processing is applied to the compound trellis to take the inter-chip interference into account. Inter-codeword interference is also accounted for by state-dependent decision feedback. The resulting scheme is denoted as bRSSE-pS and has a significantly lower complexity than bRSSE with brute-force search. By introducing a sphere constraint on the overall decoding trellis (SC-bRSSE-pS), the complexity of bRSSE-pS can be further reduced. Omitting states in the CCK subset trellises that violate the sphere constraint, edges that emanate from such states can be pruned, and the average number of metric calculations per CCK trellis segment can be reduced. Simulation results show that the performance of bRSSE-pS and SC-bRSSE-pS, respectively, is essentially equivalent to that of bRSSE with brute-force search, while complexity is significantly reduced.
Authors with CRIS profile
Wolfgang Gerstacker
Lehrstuhl für Digitale Übertragung
Robert Schober
Lehrstuhl für Digitale Übertragung
How to cite
APA:
Jonietz, C., Gerstacker, W., & Schober, R. (2008). Sphere Constrained Block RSSE with Per-Survivor Intra-Block Processing for CCK Transmission. In IEEE (Eds.), Proceedings of the 2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications. Bologna, IT: IEEE.
MLA:
Jonietz, Christof, Wolfgang Gerstacker, and Robert Schober. "Sphere Constrained Block RSSE with Per-Survivor Intra-Block Processing for CCK Transmission." Proceedings of the 2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications, Bologna Ed. IEEE, IEEE, 2008.
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