Select the false statement about CDMA technology - I. CDMA technology…
2022
Select the false statement about CDMA technology - I. CDMA technology optimizes the use of available bandwidth as it transmits over the entire frequency range. II. Each user in a CDMA system uses a different code to modulate their signal. III. CDMA technology offers less security as compared to the GSM technology. IV. A SIM card is always required for the working of a CDMA device.
Answer: D. (III) and (IV) — To find the false statements, let's analyze each claim: Statement I (True): CDMA uses Spread Spectrum technology. Unlike FDMA or TDMA, which divide by…
- A.
Only (I)
- B.
Only (II)
- C.
(I) and (II)
- D.
(III) and (IV)
Attempted by 8 students.
Show answer & explanation
Correct answer: D
To find the false statements, let's analyze each claim:
Statement I (True): CDMA uses Spread Spectrum technology. Unlike FDMA or TDMA, which divide by frequency or time, CDMA allows all users to transmit over the entire available bandwidth simultaneously.
Statement II (True): This is the core principle of CDMA. Each user is assigned a unique orthogonal code. The receiver uses this specific code to filter out the desired signal from the "noise" of other users.
Statement III (False): CDMA is generally considered more secure than GSM. Because the signal is spread across a wide bandwidth and requires a specific code to reconstruct, it is much harder to jam or intercept compared to the time-slotted signals of GSM.
Statement IV (False): Historically, CDMA devices were "handset-based," meaning the subscriber information was programmed directly into the device's internal memory (NVRAM). While newer LTE-compatible CDMA phones use SIM cards (R-UIM), a SIM card is not always required for the fundamental working of a CDMA device, unlike GSM which is "subscriber-based."