Diversity techniques in indoor mobile radio with DS-CDMA multi-h CPM
- 1 January 1994
- proceedings article
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 4, 1383-1387
- https://doi.org/10.1109/wncmf.1994.529479
Abstract
Multi-h continuous-phase modulation (CPM) is combined with a direct-sequence spread spectrum system and its performance is assessed in several indoor environments (line-of-sight (LOS), non-LOS and factories). The study is performed for two different multi-h codes considering a coherent receiver structure which is optimum for AWGN. Improvements in the performance are obtained with the use of diversity in the receiver. Two different types of diversity are considered, selection diversity and a post-detection diversity scheme implemented by means of two Viterbi receivers. Results show that CDMA multi-h CPM can achieve a good performance when used in indoor environments for relatively high bit rates but specially for factories the use of diversity techniques, further coding or interleaving is needed to achieve a given BER for realistic values of E/sub b//N/sub 0/.AnglaiKeywords
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