Coherent single antenna interference cancellation for gsm/gprs/edge

A method for midamble estimation, comprising the steps of:

• receiving a burst of symbols;
• selecting a subset of the burst of symbols that comprises a first midamble symbol;
• determining an estimated channel corresponding to each symbol in the subset;
• suppressing interference on each estimated channel using single antenna interference cancellation;
• decoding each estimated channel to obtain a corresponding sequence of estimated data symbols;
• performing a cyclic redundancy check on each sequence of estimated data symbols until a valid condition is detected;
• and
• determining the symbol in the subset corresponding to the valid condition to be the first midamble symbol.

A receiver comprising:

• an antenna configured to receive a burst of symbols;
• a timing estimator configured to select a subset of the burst of symbols that comprises a first midamble symbol;
• a midamble estimator configured to calculate, for each symbol in the subset, a corresponding midamble estimation error;
• and
• a processor configured to select the symbol in the subset corresponding to a lowest calculated midamble estimation error as the first midamble symbol.

A receiver, comprising:

• an antenna configured to receive a burst of symbols;
• a timing estimator configured to select a subset of the burst of symbols that comprises a first midamble symbol;
• a channel estimator configured to determine an estimated channel corresponding to each symbol in the subset;
• a single antenna interference cancellation device configured to suppress interference on each estimated channel;
• a data processor configured to decode each estimated channel to obtain a corresponding sequence of estimated data symbols;
• and
• a validation device configured to perform a cyclic redundancy check on each sequence of estimated data symbols until a valid condition is detected, and to determine the symbol in the subset corresponding to the valid condition to be the first midamble symbol.

A receiver comprising:

• means for receiving a burst of symbols;
• means for selecting a subset of the burst of symbols that comprises a first midamble symbol;
• means for calculating, for each symbol in the subset, a corresponding midamble estimation error;
• and
• means for selecting the symbol in the subset corresponding to a lowest calculated midamble estimation error as the first midamble symbol.

A receiver, comprising:

• means for receiving a burst of symbols;
• means for selecting a subset of the burst of symbols that comprises a first midamble symbol;
• means for determining an estimated channel corresponding to each symbol in the subset;
• means for suppressing interference on each estimated channel;
• means for decoding each estimated channel to obtain a corresponding sequence of estimated data symbols;
• and
• means for performing a cyclic redundancy check on each sequence of estimated data symbols until a valid condition is detected, and to determine the symbol in the subset corresponding to the valid condition to be the first midamble symbol.

A machine-readable medium comprising instructions for midamble estimation, the instructions comprising code for:

• receiving a burst of symbols;
• selecting a subset of the burst of symbols that comprises a first midamble symbol;
• calculating, for each symbol in the subset, a corresponding midamble estimation error;
• and
• determining the lowest calculated midamble estimation error to locate the first midamble symbol.

A machine-readable medium comprising instructions for midamble estimation, the instructions comprising code for:

• receiving a burst of symbols;
• selecting a subset of the burst of symbols that comprises a first midamble symbol;
• determining an estimated channel corresponding to each symbol in the subset;
• suppressing interference on each estimated channel using single antenna interference cancellation;
• decoding each estimated channel to obtain a corresponding sequence of estimated data symbols;
• performing a cyclic redundancy check on each sequence of estimated data symbols until a valid condition is detected;
• and
• determining the symbol in the subset corresponding to the valid condition to be the first midamble symbol.