Technique for communicating digitally modulated signals over...

Details Technique for communicating digitally modulated signals over... Technique for communicating digitally modulated signals over...

H - Electricity

04

B

H04B 3/06 (2006.01) H04B 7/005 (2006.01) H04L 5/02 (2006.01) H04L 27/04 (2006.01)

Patent

CA 2266114

In a communications system implementing an in-band on channel AM (IBOC-AM) (also known as "hybrid IBOC-AM") scheme, digitally modulated signals are transmitted in a 30 kHz digital band centered at an analog host AM carrier frequency f c. The host AM carrier is assigned to the geographic area served by the communications system for AM radio broadcast. It is likely that a similar IBOC-AM scheme is implemented in an adjacent area which is assigned a second analog host AM carrier having a frequency which is either 20 kHz higher or lower than f c. In that case, the transmission of the digitally modulated signals are interfered by a similar transmission in the adjacent area. The interference is known as "second adjacent channel interference." To reduce such interference, selected power profiles in accordance with the invention are used to allocate the relative transmission power to the digitally modulated signals in the digital band.

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