Signal combining scheme for wireless transmission systems...

Details Signal combining scheme for wireless transmission systems... Signal combining scheme for wireless transmission systems...

H - Electricity

04

B

H04B 7/02 (2006.01) H04L 1/02 (2006.01) H04L 1/06 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2322930

In a wireless transmission system that transmits the same information in parallel using two or more different types of modulation schemes, such as a satellite-based digital audio transmission system transmitting two TDM signals and a single OFDM signal, a receiver processes the differently modulated signals to generate separate demodulated signals that are then combined to form a single combined signal for further processing (e.g., decoding). In one embodiment, the receiver applies a maximal ratio combining (MRC) technique to generate a single optimal ratio combined signal from the differently modulated signals. By combining the differently modulated signals using an MRC technique, the adverse affects of noise related to inter- symbol interference in the individual signals can be reduced and the complexity of hardware in the receiver can be reduced.

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