Impact of Convolutional Coding on Downlink Performance of WCDMA Network

Third generation of mobile communications systems (3G) integrate a wide variety of wireless services as multimedia services. Universal Mobile Telecommunications System (UMTS) is the main standard of 3G with WCDMA air interface. The CDMA provides both error detection and error correction as channel coding scheme. The first one is provided by Cyclic Redundancy Check (CRC) coding and the latter by a combination convolution code with turbo decoding. For convolution coding, both soft and hard decision is considered This paper gives simulation observations of convolution coding effect on forward link (downlink) for voice and video service. The results are compared with and without utility based CAC scheme of WCDMA technology and its channel convolution coding soft and hard decision scheme.