Title :
Spatial channel characterisation of FDD wireless links
Author :
Allen, B. ; Beach, M. ; Karlsson, P.
Author_Institution :
Bristol Univ., UK
Abstract :
For smart antenna deployments in frequency division duplex (FDD) applications the downlink weight vector can be derived from the uplink steering vector. However, this assumes a degree of correlation between these channels. It is shown here that de-correlation between uplink and downlink power azimuth spectrums (PAS) is significant for frequency offsets as small as 5 MHz in urban environments, with this increasing to 15 MHz when long term averaging is applied. Results reported here are computed from measured data taken within the UMTS (Universal Mobile Telecommunications System) frequency band for a cluttered urban environment
Keywords :
adaptive antenna arrays; clutter; correlation methods; decorrelation; land mobile radio; radio links; radiowave propagation; telecommunication channels; 15 MHz; 5 MHz; FDD applications; FDD wireless links; UMTS frequency band; Universal Mobile Telecommunications System; channel correlation; cluttered urban environment; de-correlation; downlink power azimuth spectrum; downlink weight vector; frequency division duplex applications; frequency offsets; long term averaging; propagation measurement; smart antenna; spatial channel characterisation; uplink power azimuth spectrum; uplink steering vector; urban environments;
Conference_Titel :
3G Mobile Communication Technologies, 2001. Second International Conference on (Conf. Publ. No. 477)
Conference_Location :
London
Print_ISBN :
0-85296-731-4
DOI :
10.1049/cp:20010014
