초록 ▼

A method and system incorporating the use of interference cancellation during synchronized demodulation of a code division multiple access (CDMA) signal is described. A wireless communications receiver uses synchronized demodulation techniques to estimate the data contained in multiple orthogonal su

A method and system incorporating the use of interference cancellation during synchronized demodulation of a code division multiple access (CDMA) signal is described. A wireless communications receiver uses synchronized demodulation techniques to estimate the data contained in multiple orthogonal sub-channels of multiple CDMA signals. In response to these estimates an ideal waveform is constructed for each CDMA signal. These ideal waveforms are subtracted from the original signal received to form an interference-cancelled version of the original signal which is used when demodulating individual orthogonal sub-channels.

대표청구항 ▼

[ I claim:] [1.] In a wireless telecommunication system in which a receiver receives a first composite signal comprising a target CDMA signal and at least one interfering CDMA signal, each CDMA signal consisting of a set of synchronized, orthogonal sub-channels, each set including a pilot sub-channe

[ I claim:] [1.] In a wireless telecommunication system in which a receiver receives a first composite signal comprising a target CDMA signal and at least one interfering CDMA signal, each CDMA signal consisting of a set of synchronized, orthogonal sub-channels, each set including a pilot sub-channel which allows synchronized demodulation of the other non-pilot sub-channels within its parent CDMA signal, a method of processing the first composite signal comprising the steps of:(a) receiving the first composite signal;(b) using the pilot sub-channel within the at least one interfering CDMA signal to perform a first synchronized demodulation of the non-pilot sub-channels within the interfering CDMA signal to form estimates of the transmitted values and estimates of received signal strengths for each sub-channel of the at least one interfering CDMA signal;(c) creating a first reconstructed version of the at least one interfering CDMA signal by performing ideal waveform generation using said estimates of the transmitted values and said estimates of received signal strengths;(d) performing a delay on the first composite signal to create a delayed composite signal which is synchronized in time with said first reconstructed version of the at least one interfering CDMA signal;(e) subtracting from said delayed composite signal said first reconstructed version of the at least one interfering CDMA signal, to produce a second composite CDMA signal;(f) demodulating a non-pilot sub-channel of the target CDMA signal using said second composite CDMA signal as input.