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In this paper, we compare the performance of two downlink capacity-improvement schemes based on orthogonal code-hopping multiplexing (OCHM) and multiple scrambling codes (MSCs). Both OCHM and MSC systems have been proposed to overcome a code-limitation problem in a code division multiple access (CDMA) downlink. We mathematically analyze the user capacity in a general form, considering various factors...
Orthogonal code hopping multiplexing (OCHM) was developed to accommodate more downlink orthogonal channels than the number of orthogonal codewords through statistical multiplexing. Therefore, code-collisions may occur due to random code hopping patterns. The conventional code-collision control schemes are synergy and perforation. We propose a distance-based code-collision control scheme using erasure...
We compare the performance of the downlink capacity improvement schemes based on orthogonal code hopping multiplexing (OCHM) and multiple scrambling codes (MSC). Both OCHM and MSC have been proposed in order to overcome a code-limitation problem in CDMA downlink. However, both schemes exhibit different characteristics. In order to increase user capacity in CDMA downlink, OCHM allocates a random hopping...
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