Crossword labs

3. Sometimes a hostile transmitter can jam the transmission. To avoid this the channel should be _________ to any external interference.
6. In _________ power control, the transmitter estimates the channel condition and adjusts its transmission power accordingly.
9. __________ diversity obtains independent diversity paths just by using several base stations and this method reduces fading problems.
11. The bit error rate performance of ________ equilizer is better than DFE equilizer.
13. In FDD systems, the uplink and downlink use ________ carrier frequencies.
14. _______ time transmit diversityis an open loop technique in which the symbols are spread using multiple walsh code.
15. In an eye pattern, the maximum eye opening represents the measure of maximum degradation of the signal component due to ________ interference.

1. An externally generated interfering signal is known as _______signal.
2. The maximum length sequence is a type of cyclic code which represents a commonly used ________ PN sequence.
4. The most important advantage of _______ spectrum modulation is that it provides protection against externally generated interfering signals.
5. With the serial search system, the _________ time is too large.
7. A ________ noise sequence may be defined as a coded sequenceof 1s ans 0s with certain auto correlation properties.
8. _________ techniques are used for receiving cellular mobile communication signals.
10. _______ diversity can be viewed as a special case of space diversity since it also requires multiple antennas.
12. In ______, more than one user is allowed to share a channel or subchannel with the help of direct-sequence spread spectrum signals.