Adaptive Coding Rate and Process Gain Control with Channel Activation for Multi-Media DS/CDMA Systems

Sadayuki ABETA  Seiichi SAMPEI  Norihiko MORINAGA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E80-B   No.4   pp.581-588
Publication Date: 1997/04/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
Keyword: 
DS/CDMA,  channel activation,  soft power control,  adaptive modulation,  

Full Text: PDF>>
Buy this Article




Summary: 
This paper proposes an adaptive coding rate and process gain control technique with channel activation function to realize a CDMA based radio subsystem for multi-media communication services that include two types of media, i.e., fixed size data such as the computer data and still image, and constant bit rate data such as voice and video. The proposed system achieves high throughput data transmission for the fixed size data by controlling the process gain and coding rate according to the variation of the channel. Moreover, to adopt the constant bit rate data, the proposed system also employs a channel activation technique. Computer simulation confirms that the proposed system is very effective for multi-media communication services.