Mumbai university > Comp > SEM 8 > Mobile Communication

Marks: 7M

Year: Revised 2012

• Channel bandwidth: 5Mhz

• Duplex mode: FDD and TDD

• Spread Spectrum Technique: Direct Spread

• Chip Rate: 3.84Mhz

• Frame Length: 10ms (800 chips/sec)

• Slot length: 15 Slots per frame (2560 chips/slot)

• Spreading modulation: Balanced QPSK (downlink) and dual channel modulation (uplink) with complex spreading circuit

• Data Modulation: QPSK (downlink) and BPSK (uplink)

• Channel coding: Convolutional code, Turbo code and no coding

• Spreading factors 4-256 (uplink) and 4-512 (downlink)

• Modulation symbol rates vary from 960 K symbols/s to 15 K symbols/s (7.5 K symbols/s) for FDD uplink (downlink)

• Spreading (downlink): OVSF sequences for channel separation

• Gold sequences $2^{18} – 1$ for cell and user separation (truncated cycle: 10ms)

• Spreading (uplink): OVSF sequences for channel separation

• Gold sequences $2^{25} – 1$ for cell and user separation (truncated cycle: 10ms)