1. In the CDMA spread spectrum system, if the number of users of a certain sector increases, the spread processing gain of the sector becomes large, and the interference tolerance of the sector system becomes small.

2. CDMA cellular system divides a forward physical channel into multiple logical channels, with a maximum of 63 forward traffic channels.

3. Pilot strength (Ec/Io) in the CDMA 1X system is an important parameter for characterizing network forward coverage and co-channel interference.

4. In the LAC area planning, the length of the configuration message is independent of the neighboring area and the number of carrier frequencies.

5. How many PN short code can be used in CDMA system?

6. In the CDMA system model, the order of information flow direction is correct:

7. The system does not use the same-frequency hard-switching function only when a call meets the following conditions at the same time. These conditions include: (Multiple Choice)

8. The difference between CDMA1x EVDO (hereinafter referred to as DO) and CDMA1X in the forward link budget is: (Multiple Choice)

9. The synchronization channel contains information such as long code status, system time, paging rate, and pilot PN sequence offset (PILOT_PN).

10. The voice business CQT test project includes: (Multiple Choice)

11. Features of spread spectrum communication technology include: (Multiple Choice)

12. In the capacity planning, for the reverse channel, each sector reserves _______ reverse CEs for processing the reverse common channel.

13. In the pre-planning phase, the bureau requires that the outdoor area coverage probability of the urban area is 90%, and the shadow fading margin required for the link budget is:

14. When there are multiple soft handoff branches, each branch has its own neighboring cell. The neighboring cell order sent by the BSC is arranged according to the priority and the signal strength RX POWER of each branch.

15. What are the reasons for the value of the FER that will affect the forward channel? (Multiple Choice)

16. The duplex mode used by CDMA2000 1X is:

17. The following correct description of the effects of noise on the communication system is: (Multiple Choice)

18. For EVDO Rev.B, the correct statement of the following is: (Multiple Choice)

19. In the process of the open loop power control, the mobile station adjusts its own transmit power according to ( ) at the selected frequency point.

20. The CDMA network can judge whether the mobile phone roams through the SID and the NID.