Symbol perforation reduction schemes for orthogonal code hopping multiplexing

Our previously proposed orthogonal code hopping multiplexing (OCHM) [1], [2] scheme is designed to accommodate a large number of bursty downlink users. However, it may undergo link quality degradation due to symbol perforations occurring when all code-collision symbol values are not identical. In this letter, a group-level random codeword hopping-pattern allocation (GRCHA) scheme is proposed to produce fewer symbol perforations than the previous symbol-by-symbol random codeword hopping (SRCH) of OCHM [1]. The proposed GRCHA scheme combined with the spatial filtering capability of switched-beam array antennas (SBAA) is expected to significantly reduce the symbol perforation probability in the OCHM scheme, and inter-beam softer handoff is applied to cope with high symbol perforation probability for users in overlapping beam areas of SBAA. The performance is evaluated by theoretical analysis and simulation in terms of the average symbol perforation probability. The proposed GRCHA scheme yields better performance than the SRCH scheme and the dedicated codeword allocation scheme, and the diversity gain of inter-beam softer handoff mitigates the effect of high symbol perforation probability for users in the overlapping beam areas.
Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Issue Date
2005-10
Language
ENG
Citation

IEICE TRANSACTIONS ON COMMUNICATIONS, v.E88B, no.10, pp.4107 - 4111

ISSN
0916-8516
DOI
10.1093/ietcom/e88-b.10.4107
URI
http://hdl.handle.net/10203/2933
Appears in Collection
EE-Journal Papers(저널논문)
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