A pilot channel: Assist mobile station to be connected with CDMA network Handles multi-path searching Provide the phase reference for coherent demodulation and help the mobile station estimate the transmission power The mobile station measures and compares the pilot channel powers from the base stations during the handoff Forward pilot channel is spread over W0 … Read more
Diversity technology means that after receiving two or more input signals with mutually uncorrelated fading at the same time, the system demodulates these signals and adds them up. Thus, the system can receive more useful signals and overcome fading. A mobile communication channel is a multi-path fading channel and any transmitted signal reaches a receive … Read more
Pilot Detection Threshold (T_ADD) Any Pilot that is strong but is not in the Handoff Direction Message is a source of interference. This Pilot should be immediately moved into the active set for handoff to avoid voice/data degradation or a possible drop call. T_ADD affects the percentage of MS in handoff. It should be low … Read more
There are various parameters and terms which come into play when discussing PN offsets and their function in CDMA. System Time All base station digital transmissions are referenced to a common CDMA system-wide time scale that uses the Global Positioning System (GPS) time scale, which is traceable to and synchronous with Universal Coordinated Time (UTC). … Read more
The design of a PN offset plan for CDMA is comparable to that of a signalling channel frequency plan in analog. The consequences of poor offset planning include the following: Active Set Pilot Interference – This phenomenon would occur in the active area and involve the active search window (SRCH_WIN_A). The interfering signal would need … Read more
The UE carried out a restriction of access check during connection establishment. This function provides a means of controlling traffic load from the EU. There are separate facilities for control of Mobile originated (MO) calls and signaling. On top of regular class, parental control, specific Access Control Services (SSAC) can be applied. SSAC facilitates separate … Read more
Search Window in cdma is essential parameter to work cdma technology because based on search window as defined in system mobile needs to take important decision for available bts. Search window play main role in mobile switch on, handoff, access etc. let’s check in detail. Why Search Window? A CDMA system employs the synchronized detection … Read more
Although only 5.6% of sales of smartphones in the first quarter of 2013, Windows showed continued growth, gaining 1.9% compared to the same period last year, according to data released today by Kantar hundred Worldpanel Comtech. Almost half (49.3%) Smartphone sales, remains the best selling Android operating system, but saw only a slight increase compared … Read more