Co-channel interference reduction in wireless communications systems
First Claim
1. A method of reducing co-channel interference in a receiver arrangement of a communications system providing two received signals each comprising transmitted symbols having a predetermined symbol rate, comprising the steps of:
- for each received signal;
sampling the received signal to provide a sampled received signal comprising symbols at twice the predetermined symbol rate; and
deriving first and second sampled signals from the sampled received signal, each of said first and second sampled signals comprising samples at the predetermined symbol rate corresponding to respective alternate samples of the sampled received signal at twice the predetermined symbol rate;
combining the first and second sampled signals derived from the two received signals with respective weights to produce an output signal; and
determining the respective weights to reduce co-channel interference with a desired signal represented by said output signal.
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Accused Products
Abstract
Co-channel interference with a desired signal in a receiver arrangement of a TDMA cellular radio communications system having two antennas and receivers for providing two received signals is reduced. Two sampled signals are derived from each of the two received signals by sampling the respective received signal at twice the symbol rate of the system and separating alternate samples at twice the symbol rate to produce the two sampled signals each with different samples at the symbol rate, providing a total of four sampled signals from the two antennas. These signals are linearly combined with respective weights to produce an output signal, the weights being determined to reduce co-channel interference with the desired signal represented by the output signal.
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Citations
13 Claims
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1. A method of reducing co-channel interference in a receiver arrangement of a communications system providing two received signals each comprising transmitted symbols having a predetermined symbol rate, comprising the steps of:
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for each received signal;
sampling the received signal to provide a sampled received signal comprising symbols at twice the predetermined symbol rate; and
deriving first and second sampled signals from the sampled received signal, each of said first and second sampled signals comprising samples at the predetermined symbol rate corresponding to respective alternate samples of the sampled received signal at twice the predetermined symbol rate;
combining the first and second sampled signals derived from the two received signals with respective weights to produce an output signal; and
determining the respective weights to reduce co-channel interference with a desired signal represented by said output signal. - View Dependent Claims (2, 3, 4, 5)
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6. A receiver arrangement for a communications system, comprising:
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first and second receivers for providing two received signals each comprising transmitted symbols having a predetermined symbol rate;
samplers for sampling the received signals at twice the predetermined symbol rate to produce sampled received signals;
delay elements for delaying the sampled received signals each by one symbol at twice the predetermined symbol rate to produce delayed signals;
decimators for decimating the sampled received signals and the delayed signals each by a decimation factor of two to produce four sampled signals each comprising samples at the predetermined symbol rate; and
a combining arrangement for combining the four sampled signals with respective weights to produce an output signal. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of reducing co-channel interference with a desired signal in a receiver arrangement of a TDMA cellular radio communications system having two antennas and receivers for providing two received signals, comprising deriving two sampled signals from each of the two received signals by sampling the respective received signal at a rate of at least twice a predetermined symbol rate of the system and separating alternate samples at twice the predetermined symbol rate to produce said two sampled signals each with different samples at the predetermined symbol rate, linearly combining the two sampled signals derived from each of the two received signals with respective weights to produce an output signal, and determining the respective weights to reduce co-channel interference with the desired signal represented by said output signal.
Specification