WCDMA technology by R4R Team

Wideband code division multiple access (W-CDMA): OR WCDMA technology:

Wideband code division multiple access is a 3rd generation mobile communication system that uses code division multiple access (CDMA) technology over a wide frequency band to provide high-speed multimedia and efficient voice services. The WCDMA infrastructure is compatible with GSM mobile radio communication system. WCDMA provides for high-speed data and voice communication services. Installing or upgrading to WCDMA technology allows mobile service providers to offer their customers wireless broadband (high-speed Internet) services and to operate their systems more efficiently .

W-CDMA can support mobile/portable voice, images, data, and video communications at up to 2 Mbps (local area access) or 384 Kbps (wide area access). The input signals are digitized and transmitted in coded, spread-spectrum mode over a broad range of frequencies. A 5 MHz-wide carrier is used, compared with 200 KHz-wide carrier for narrowband CDMA

Features of W-CDMA:

a)Frequency Division Duplex (FDD): Separates users by employing both codes as well as frequencies. One frequency is used for the uplink, while another is used for the downlink.
b)Time Division Duplex (TDD): Separates users by employing codes, frequencies and time, wherein the same frequency is used for both uplink and downlink.

Diffrence b/w cdma and w-cdma:

1. CDMA is a 2G technology while WCDMA is a 3G technology
2. CDMA and WCDMA are not used together
3. WCDMA offers much faster speeds compared to CDMA
4. CDMA uses frequency bands 1.25Mhz wide while WCDMA uses frequency bands 5Mhz wide
5. The WCDMA doesn’t share the same design as CDMA
6. CDMA and its successors are being phased out in favor of GSM and WCDMA

Performance comparison W-CDMA  between CDMA2000 :are given below.....