Answer / Vikas Chanchal

CDMA (Code Division Multiple Access) and GSM (Global System for Mobile Communications) are two popular wireless communication standards used in mobile networks. Here's a summary of their key differences:
1. Multiplexing technique: CDMA uses spread spectrum multiple access while GSM uses frequency division multiple access (FDMA).
2. Spectrum efficiency: CDMA offers better spectral efficiency compared to GSM.
3. Duplexing method: CDMA uses time division duplex (TDD) or frequency division duplex (FDD), while GSM uses FDD.
4. Voice encoding: GSM uses a higher bit-rate voice encoder than CDMA, resulting in better voice quality.
5. Standardization bodies: CDMA is primarily used by Qualcomm and its licensees, while GSM is standardized by the European Telecommunications Standards Institute (ETSI).

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