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Titolo:
CAPACITY OF A CELLULAR TIME-DIVISION DUPLEX CDMA SYSTEM
Autore:
POVEY GJR;
Indirizzi:
UNIV EDINBURGH,DEPT ELECT ENGN EDINBURGH EH9 3JL MIDLOTHIAN SCOTLAND BRITISH TELECOM LABS IPSWICH ENGLAND
Titolo Testata:
IEE proceedings. Communications
fascicolo: 5, volume: 141, anno: 1994,
pagine: 351 - 356
SICI:
1350-2425(1994)141:5<351:COACTD>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Keywords:
TIME DIVISION DUPLEX; CDMA CELLULAR SYSTEM; MULTIPATH COMBINING; RAKE RECEIVER; DOPPLER FADING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
G.J.R. Povey, "CAPACITY OF A CELLULAR TIME-DIVISION DUPLEX CDMA SYSTEM", IEE proceedings. Communications, 141(5), 1994, pp. 351-356

Abstract

A time division duplex (TDD) technique is considered for a CDMA cellular system. Its use enables all the multipath combining (using a RAKE type receiver) to be located in the base site rather than in the mobile unit. This is possible due to the reciprocal uplink and downlink channels which are created by time division, and employ the same carrier frequency. Simulations show that at low Doppler fading rates TDD is only marginally lower in cell capacity than conventional frequency division duplex (FDD) techniques. However, at higher Doppler fading rates (for high speed mobiles) the cell capacity degrades in a nonlinear manner and will breakdown suddenly, unlike that of a comparable FDD CDMA system. The limitation of the TDD technique results from the noncontinuous receiver training caused by the bursty nature of the communications. Losses in cell capacity are also due to the guard times inserted between the uplink and downlink transmissions.

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Documento generato il 15/07/20 alle ore 15:01:56