WCDMA无线接入标准性能分析

Performance Analysis of WCDMA Radio Access Standard

从移动台发功率和小区用户最大容量角度对WCDMA(宽带码分多址)标准进行了分析,并与cdm a2000或EV-DO标准的相关参数进行了比较。证明WCDMA在规定的频段及发信速率条件下移动台无法提供所需的发信功率。此外WCDMA只能提供对称的上、下行物理信道,无法满足移动因特网的需求。ITU(国际电信联盟)选择2 GHz频段作为车载移动通信频段是勉为其难的,又将其对称分配给上、下行物理信道更是不合理的。只有采用TDMA(时分多址)方式的cdm a2000 1XEV-DO或EDGE方式才能提供高速无线接入。

Based on the transmission power of the mobile station and the maximum cell capacity, the analysis of WCDMA standard and the comparison of some parameters of WCDMA and cdma2000 or EV-DO are given in this paper. The result proves that the mobile station of WCDMA can＇ t provide the required transmission power on the specified waveband and data rates, and the symmetrical capacity on downlink and uplink can＇ t meet the requirement of mobile Internet. It＇ s questionable for ITU to choose the waveband of 2 GHz for the mobile telecommunication and unreasonable to distribute it over the downlink and uplink channels symmetrically. Only cdma2000 1X EV- DO or EDGE, which adopts TDMA method, can provide high speed wireless access Rb.