초록 ▼

A level of interference affecting signal components of received communication signals is estimated and used to weight the signal components. The signal components in a each of a number of groups of signal components are weighted based on respective interference estimates to thereby adjust signal com

A level of interference affecting signal components of received communication signals is estimated and used to weight the signal components. The signal components in a each of a number of groups of signal components are weighted based on respective interference estimates to thereby adjust signal components for colored interference, which may vary significantly between different groups of signal components. Each group of signal components may include a single component or components within a relatively narrow sub-band of the communication signals, such as a coherence bandwidth of an Orthogonal Frequency Division Multiplexing (OFDM) signal.

대표청구항 ▼

1. A non-transitory, computer accessible memory medium storing program instructions for processing communication signals by a communication signal receiver, wherein the program instructions, when executed, cause the communication signal receiver to: receive at least one communication signal, the at

1. A non-transitory, computer accessible memory medium storing program instructions for processing communication signals by a communication signal receiver, wherein the program instructions, when executed, cause the communication signal receiver to: receive at least one communication signal, the at least one communication signal comprising a plurality of signal components;estimate interference affecting the at least one received communication signal to obtain at least a first interference estimate based on a first modulated symbol of a first signal component from the plurality of signal components; andapply a first weight based on the first interference estimate to a first signal component of the plurality of signal components to obtain a first weighted signal component. 2. The non-transitory, computer accessible memory medium of claim 1, wherein the program instructions, when executed, further cause the communication signal receiver to decode the first weighted signal component. 3. The non-transitory, computer accessible memory medium of claim 2, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals, and decoding comprises combining at least one weighted signal component of each of the plurality of received communication signals. 4. The non-transitory, computer accessible memory medium of claim 3, wherein the signal combining uses hard-decision estimates. 5. The non-transitory, computer accessible memory medium of claim 4, wherein the hard-decision estimates are generated using summations over a coherence bandwidth of Orthogonal Frequency Division Multiplexing (OFDM) signals. 6. The non-transitory, computer accessible memory medium of claim 1, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals. 7. The non-transitory, computer accessible memory medium of claim 6, wherein the communication signals comprise diversity signals in a Space-Time Transmit Diversity (STTD) system. 8. The non-transitory, computer accessible memory medium of claim 7, wherein the diversity signals are Orthogonal Frequency Division Multiplexing (OFDM) signals, and wherein the plurality of signal components comprises sub-carrier signals. 9. The non-transitory, computer accessible memory medium of claim 7, wherein the STTD system is a 2-by-2 STTD system. 10. The non-transitory, computer accessible memory medium of claim 1, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals, and wherein the communication signals comprise received communication signals in a Multiple Input Multiple Output (MIMO) system. 11. The non-transitory, computer accessible memory medium of claim 1, wherein the program instructions, when executed, further cause the communication signal receiver to decode the first weighted signal component, wherein the decoding comprises interference-weighted hard-decision decoding. 12. The non-transitory, computer accessible memory medium of claim 11, wherein applying comprises applying at least the first weight to each signal component in a first group of signal components that includes the first signal component, and wherein the program instructions, when executed, further cause the communication signal receiver to apply a second weight to each signal component in a second group of signal components. 13. The non-transitory, computer accessible memory medium of claim 11, wherein decoding further comprises generating first-cut hard-decision estimates of the at least one communication signal and using the first-cut hard-decision estimates in the interference-weighted hard-decision decoding. 14. The non-transitory, computer accessible memory medium of claim 13, wherein the program instructions, when executed, further cause the communication signal receiver to determine whether the first-cut hard-decision estimates are within a tolerance of results of the interference-weighted hard-decision decoding, and if not, repeat the interference-weighted hard-decision decoding using the interference-weighted hard-decision decoding results. 15. The non-transitory, computer accessible memory medium of claim 14, wherein determining whether the first-cut hard-decision estimates are within the tolerance of the interference-weighted hard-decision decoding results comprises measuring the Euclidean distance between the first-cut hard-decision estimates and the interference-weighted hard-decision decoding results. 16. The non-transitory, computer accessible memory medium of claim 1, wherein the program instructions, when executed, further cause the communication signal receiver to demodulate the plurality of signal components to generate demodulated signal components, and apply respective weights to at least two of the demodulated signal components. 17. The non-transitory, computer accessible memory medium of claim 16, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals, and wherein demodulating comprises determining a log likelihood ratio of each bit of a modulation symbol mapped to signal components of transmitted signals respectively corresponding to the plurality of signal components of the received communication signals, and wherein the program instructions, when executed, further cause the communication signal receiver to apply respective weights to the log likelihood ratio with respective estimates of interference power. 18. The non-transitory, computer accessible memory medium of claim 17, wherein the program instructions, when executed, further cause the communication signal receiver to decode the received communication signals to generate decoded communication signal components, and wherein demodulating comprises demodulating the decoded communication signal components. 19. The non-transitory, computer accessible memory medium of claim 18, wherein the decoded communication signal components comprise a first plurality of decoder output signal components and a second plurality of decoder output signal components, and wherein demodulating comprises determining the log likelihood ratio for each decoder output signal component. 20. The non-transitory, computer accessible memory medium of claim 1, wherein the non-transitory, computer accessible memory medium is comprised in a mobile station. 21. A mobile station configured to process communication signals, wherein the mobile station comprises: a receiver, configured to receive at least one communication signal, the at least one communication signal comprising a plurality of signal components;processing hardware coupled to the receiver, wherein the processing hardware is configured to: estimate interference affecting the received at least one communication signal to obtain at least a first interference estimate based on a first modulated symbol of a first signal component from the plurality of signal components; andapply a first weight based on the first interference estimate to the first signal component of the plurality of signal components to obtain a first weighted signal component. 22. The mobile station of claim 21, wherein the processing hardware is further configured to decode the first weighted signal component. 23. The mobile station of claim 22, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals, and decoding comprises combining at least one weighted signal component of each of the plurality of received communication signals. 24. The mobile station of claim 23, wherein the signal combining uses hard-decision estimates. 25. The mobile station of claim 24, wherein the hard-decision estimates are generated using summations over a coherence bandwidth of Orthogonal Frequency Division Multiplexing (OFDM) signals. 26. The mobile station of claim 21, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals. 27. The mobile station of claim 26, wherein the communication signals comprise diversity signals in a Space-Time Transmit Diversity (STTD) system. 28. The mobile station of claim 27, wherein the diversity signals are Orthogonal Frequency Division Multiplexing (OFDM) signals, and wherein the plurality of signal components comprises sub-carrier signals. 29. The mobile station of claim 27, wherein the STTD system is a 2-by-2 STTD system. 30. The mobile station of claim 21, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals, and wherein the communication signals comprise received communication signals in a Multiple Input Multiple Output (MIMO) system. 31. The mobile station of claim 21, wherein the processing hardware is further configured to decode the first weighted signal component, wherein the decoding comprises interference-weighted hard-decision decoding. 32. The mobile station of claim 31, wherein applying comprises applying at least the first weight to each signal component in a first group of signal components that includes the first signal component and applying a second weight to each signal component in a second group of signal components. 33. The mobile station of claim 31, wherein decoding further comprises generating first-cut hard-decision estimates of the at least one communication signal and using the first-cut hard-decision estimates in the interference-weighted hard-decision decoding. 34. The mobile station of claim 33, wherein the processing hardware is further configured to determine whether the first-cut hard-decision estimates are within a tolerance of results of the interference-weighted hard-decision decoding, and if not, repeat the interference-weighted hard-decision decoding using the interference-weighted hard-decision decoding results. 35. The mobile station of claim 34, wherein determining whether the first-cut hard-decision estimates are within the tolerance of the interference-weighted hard-decision decoding results comprises measuring the Euclidean distance between the first-cut hard-decision estimates and the interference-weighted hard-decision decoding results. 36. The mobile station of claim 21, wherein the processing hardware is further configured to demodulate the plurality of signal components to generate demodulated signal components, and apply respective weights to at least two of the demodulated signal components. 37. The mobile station of claim 36, wherein receiving the at least one communication signal comprises receiving a plurality of communication signals, and wherein demodulating comprises determining a log likelihood ratio of each bit of a modulation symbol mapped to signal components of transmitted signals respectively corresponding to the plurality of signal components of the received communication signals, and wherein the processing hardware is further configured to apply respective weights to the log likelihood ratio with respective estimates of interference power. 38. The mobile station of claim 37, wherein the processing hardware is further configured to decode the received communication signals to generate decoded communication signal components, and wherein demodulating comprises demodulating the decoded communication signal components. 39. The mobile station of claim 38, wherein the decoded communication signal components comprise a first plurality of decoder output signal components and a second plurality of decoder output signal components, and wherein demodulating comprises determining the log likelihood ratio for each decoder output signal component.