Broad band and narrow band frequency response equalization

1. A distributed antenna system (DAS) comprising:

at least one radio interface module (RIM) associated with a remote unit (RU), the radio interface module (RIM) and the remote unit (RU) configured for transmitting and receiving at least one narrow band of frequencies within a broad band channel over a signal path;

a signal generator associated with a signal path between the radio interface module (RIM) and the remote unit (RU), the signal generator configured for generating a test signal;

a master controller configured to generate the test signal; and

an equalizer for adjusting a gain setting for the signal path according to the at least one narrow band of frequencies.

2. The distributed antenna system (DAS) of claim 1 , wherein the radio interface module (RIM) comprises the signal generator.

3. The distributed antenna system (DAS) of claim 2 , further comprising a head end unit (HEU), the head end unit (HEU) being coupled to the radio interface module (RIM) for transmission and reception of the broad band channel as well as the at least one narrow band of frequencies to and from the remote unit (RU).

4. The distributed antenna system (DAS) of claim 3 , wherein the coupling comprises a coupling selected from the group consisting of an optical coupling, a wired coupling, and a hybrid optical and wired coupling.

5. The distributed antenna system (DAS) of claim 4 , wherein the remote unit (RU) comprises a remote unit controller (RU Controller) for controlling the equalizer.

6. The distributed antenna system (DAS) of claim 5 , wherein the remote unit (RU) comprises a power detector (PD) configured to monitor power of at least one of the test signal and the narrow band of frequencies, and providing a corresponding power level to the remote unit controller (RU Controller).

7. The distributed antenna system (DAS) of claim 6 , wherein the remote unit controller (RU Controller) is configured to adjust the equalizer according to power detected for at least one of the test signal and the narrow band of frequencies.

8. The distributed antenna system (DAS) of claim 7 , wherein the remote unit controller (RU Controller) is configured to transmit and receive control signals from the master controller.

9. The distributed antenna system (DAS) of claim 4 , wherein the equalizer comprises a broad band equalizer section and one or more narrow band equalizer sections.

10. The distributed antenna system (DAS) of claim 9 , wherein the each of the one or more narrow band equalizer sections comprises a pre-defined setting for adjusting a frequency response of the at least one narrow band of frequencies.

11. The distributed antenna system (DAS) of claim 9 , wherein the broad band equalizer section comprises one of a PI attenuator and a T attenuator for equalizing the test signal over a broad signal range.

12. The distributed antenna system (DAS) of claim 9 , wherein one of the narrow band equalizer sections is configured to provide a controllable slope.

13. The distributed antenna system (DAS) of claim 9 , wherein each of the one or more narrow band equalizer sections comprises at least one resonance circuit for equalizing the test signal.

14. A method for adjusting a distributed antenna system (DAS), the method comprising:

broadcasting a test signal over a frequency range using at least one narrow band of frequencies over a signal path;

detecting power for the test signal at a remote unit; and

adjusting gain for the broadcasting for the at least one narrow band of frequencies to increase response over the signal path, wherein adjusting the gain is performed prior to broadcasting the test signal for the at least one narrow band of frequencies,

wherein adjusting the gain for each of the at least one narrow band of frequencies comprises ascertaining a center-point, f c , of each narrow band of frequencies and applying predefined gain settings for the narrow band of frequencies.

15. The method of claim 14 , wherein the broadcasting comprises providing the test signal over a range of 100 MHz to 3500 MHz.

16. The method of claim 14 , wherein the signal path comprises one of an up-link (UL) and a down-link (DL).

17. A method for adjusting a distributed antenna system (DAS), the method comprising:

broadcasting a test signal over a frequency range using at least one narrow band of frequencies over a signal path;

detecting power for the test signal at a remote unit; and

adjusting gain for the broadcasting for the at least one narrow band of frequencies to increase response over the signal path, wherein adjusting the gain is performed prior to broadcasting the test signal for the at least one narrow band of frequencies,

wherein adjusting the gain for each of the at least one narrow band of frequencies further comprises:

evaluating effect on the response over a broad band channel; and,

performing the adjusting to result in an optimal match between the system response for the at least one narrow band of frequencies and system response over the broad band channel.

18. A distributed antenna system (DAS) comprising:

a plurality of radio interface modules (RIM), each radio interface module (RIM) configured to transmit and receive at least one narrow band of frequencies over a signal path;

a head end unit (HEU) configured for transmitting signals for each of the at least one narrow band of frequencies;

a remote unit (RU) configured for receiving and transmitting signals from the head end unit (HEU);

the remote unit (RU) comprising a broad band equalizer module, a plurality of narrow band equalizer modules and an equalizer controller, the equalizer controller configured for determining a gain adjustment to be applied by the broad band equalizer module and the narrow band equalizer modules; and

a master controller configured for controlling the radio interface module (RIM) and the equalizer controller.