UMTS Network Infrastructure

Napolitano, A.; Calvi, Andrea; Berruto, E.

doi:10.1002/0470841656.ch5

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2011

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“…Therefore, long spreading factors are used for low data rates, and short spreading factors are used for high data rates. Lengths of allowed spreading codes range from 4 to 512 chips [2,3]. simultaneous downlink transmission, different mobile stations in the cell are identified using different orthogonal spreading codes.…”

Section: System Modelmentioning

confidence: 99%

Space-Time Filtering for Parallel-Channel Reuse in UMTS Downlink Transmission

Alamayreh

Rahhal

2011

2011 7th International Conference on Wireless Communications, Networking and Mobile Computing

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In this paper we investigate limitations facing high rate transmission in the downlink of UMTS systems. A solution is proposed based on space-time filtering to allow parallel channel transmission and spreading code reuse. The optimum receiver is derived taking into consideration non-ideality in space-time filtering caused by channel estimation errors. Comparisons with ordinary CDMA receivers, based on dispreading the received sequence with the same code used for transmission, show significant performance enhancement in system capacity, especially at large number of utilized parallel channels and in the presence of high channel estimation errors.

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Section: System Modelmentioning

confidence: 99%