Wireless receiver
First Claim
1. A method comprising:
- receiving, at a first antenna, an observation of a symbol transmitted across a wireless communications channel perceived by the first antenna;
generating a modified observation of the symbol based on a product of the received observation and the complex conjugate of a channel estimate of the channel; and
generating, based on the modified observation and the channel estimate, log-likelihood ratios (LLRs) for the symbol for a maximum-likelihood-based decoder to decode,wherein generating log-likelihood ratios includes;
generating a LLR associated with a most significant bit of the symbol, andgenerating a LLR associated with a next most significant bit of the symbol;
wherein the log-likelihood ratio (LLR) associated with the most significant bit is generated based on the ratio of the real part (yI) or imaginary part (yQ) of the modified observation to Gaussian-distributed noise power of the channel.
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Abstract
The present invention relates to a method and apparatus for demodulation in a wireless communications system transmitted across a wireless communications channel. The described wireless receiver includes a first antenna for receiving a wireless signal including a symbol transmitted across a wireless communications channel perceived by the first antenna, an observation modifier for generating a modified observation (y) of the symbol based on a product of the received observation (r) and the complex conjugate of a channel estimate (h*), a log-likelihood ratio (LLR) module generating log-likelihood ratios (LLRs) based on the modified observation and the channel estimate, and a maximum-likelihood-based decoder for decoding the symbol based on the LLRs.
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Citations
16 Claims
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1. A method comprising:
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receiving, at a first antenna, an observation of a symbol transmitted across a wireless communications channel perceived by the first antenna; generating a modified observation of the symbol based on a product of the received observation and the complex conjugate of a channel estimate of the channel; and generating, based on the modified observation and the channel estimate, log-likelihood ratios (LLRs) for the symbol for a maximum-likelihood-based decoder to decode, wherein generating log-likelihood ratios includes; generating a LLR associated with a most significant bit of the symbol, and generating a LLR associated with a next most significant bit of the symbol; wherein the log-likelihood ratio (LLR) associated with the most significant bit is generated based on the ratio of the real part (yI) or imaginary part (yQ) of the modified observation to Gaussian-distributed noise power of the channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless receiver comprising:
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a first antenna for receiving an observation including a symbol transmitted across a wireless communications channel perceived by the first antenna; an observation modifier for generating a modified observation of the symbol based on a product of the received observation and the complex conjugate of a channel estimate of the channel; a log-likelihood ratio (LLR) for the symbol module generating log-likelihood ratios (LLRs) based on the modified observation, wherein generating log-likelihood ratios includes; generating a LLR associated with a most significant bit of the symbol, and generating a LLR associated with a next most significant bit of the symbol; wherein the log-likelihood ratio (LLR) associated with the most significant bit is generated based on the ratio of the real part (yI) or imaginary part (yQ) of the modified observation to Gaussian-distributed noise power of the channel; and a maximum-likelihood-based decoder for decoding the symbol based on the LLRs. - View Dependent Claims (14, 15)
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16. A non-transitory machine-readable medium comprising instructions executable by one or more processors, the instructions including the steps of:
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receiving, at a first antenna, an observation of a symbol transmitted across a wireless communications channel perceived by the first antenna; generating a modified observation of the symbol based on a product of the received observation and the complex conjugate of a channel estimate of the channel; and generating, based on the modified observation and the channel estimate, log-likelihood ratios (LLRs) for the symbol for a maximum-likelihood-based decoder to decode, wherein generating log-likelihood ratios includes; generating a LLR associated with a most significant bit of the symbol, and generating a LLR associated with a next most significant bit of the symbol; wherein the log-likelihood ratio (LLR) associated with the most significant bit is generated based on the ratio of the real part (yI) or imaginary part (yQ) of the modified observation to Gaussian-distributed noise power of the channel.
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Specification