2.Characteristics of W-CDMA

Amplitude fluctuates widely under the influence of terminal movement. While large fluctuations in average received power are encountered in the case of a bandwidth in which the spread of the frequency spectrum is narrow, such fluctuations become smaller as the bandwidth becomes wider.

As the W-CDMA system utilizes this characteristic, it can improve the efficiency of frequency utilization in addition to achieving high communications quality. Moreover, W-CDMA can economically realize a mobile communications environment that supports various multimedia transmissions from low to high speeds, such as data, images and moving images in addition to voice.

W-CDMA realizes a multi-band system, in which efficiency is enhanced by dual-spread codes, and asynchronous inter-cell system, coherent RAKE reception, SIR-based adaptive transmission power control and orthogonal-variable, multi-rate transmissions. In the future, moreover, using both adaptive antenna array diversity and interference cancelers will increase subscriber accommodation capacity.

W-CDMA Wireless Techniques

Created 1999/03

Updated 2002/03