The Universal Mobile Telecommunications System (UMTS) is composed of an FDD and TDD mode. The spectrum allocation is in such a way that both modes have an adjacent carrier at 1920 MHz. The implications thereof with respect to system capacity are investigated in this paper, In this context the separation distance of the TDD and FDD base station (BS) and frame synchronisation are varied. IL is shown that the most detrimental effects for the FDD interface are for small BS separations. In contrast, the optimum with respect to TDD capacity is found for the co-location of both base stations. This yields a trade-off for the optimal BS locations. Moreover, an adjacent channel protection factor of 30 dB in an interference limited system such as CDMA is shown to be too low unless a significant capacity loss is acceptable.
|Title of host publication||IEEE Sixth International Symposium on Spread Spectrum Techniques and Applications, 2000|
|Number of pages||5|
|Publication status||Published - 2000|
|Event||IEEE 6th International Symposium on Spread Spectrum Techniques and Applications - Parsippany, NJ|
Duration: 6 Sep 2000 → 8 Sep 2000
|Conference||IEEE 6th International Symposium on Spread Spectrum Techniques and Applications|
|Period||6/09/00 → 8/09/00|