UNBIASED SIGNAL-TO-NOISE RATIO ESTIMATION FOR RECEIVER HAVING CHANNEL ESTIMATION ERROR
First Claim
1. A method for estimating channel noise power in binary phase shift keying (BPSK) modulated telecommunication, the method comprising:
- receiving over the channel a first known signal, the first known signal having an identified functional form;
after receiving the first known signal, formulating a channel transfer function estimate for the channel, the channel transfer function estimate being based on the first known signal and including a channel estimation error;
receiving over the channel a second BPSK signal, the second BPSK signal including noise having a power;
equalizing the second BPSK signal using the transfer function estimate; and
estimating the second BPSK signal noise power, the noise power being substantially independent of the channel estimation error.
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Abstract
Apparatus and methods for estimating transmission noise in a programming information signal. Channel noise power in binary phase shift keying (“BPSK”) modulated telecommunication may be estimated. Such a method may include receiving over the channel a reference signal and a data BPSK signal. The data BPSK signal may include the programming information. The method may include formulating a channel transfer function estimate for the channel based on the reference signal. The estimate may include a channel estimation error. The data BPSK signal may be equalized using the transfer function estimate. The data BPSK signal may include noise, which may be quantified in terms of power. The data BPSK signal noise power may be estimated in such a manner that is independent of the channel estimation error.
129 Citations
17 Claims
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1. A method for estimating channel noise power in binary phase shift keying (BPSK) modulated telecommunication, the method comprising:
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receiving over the channel a first known signal, the first known signal having an identified functional form; after receiving the first known signal, formulating a channel transfer function estimate for the channel, the channel transfer function estimate being based on the first known signal and including a channel estimation error; receiving over the channel a second BPSK signal, the second BPSK signal including noise having a power; equalizing the second BPSK signal using the transfer function estimate; and estimating the second BPSK signal noise power, the noise power being substantially independent of the channel estimation error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for estimating noise power in binary phase shift keying (BPSK) modulated telecommunication, the method comprising:
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applying an inverse of a channel transfer function to a BPSK-modulated data signal that was received over a channel, the channel transfer function being derived from the response of a BPSK-modulated reference signal and having an estimation error; and estimating a noise power in the BPSK-modulated data signal, the noise power being substantially independent of the estimation error.
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13. Apparatus for estimating noise power in a binary phase shift keying (BPSK) modulated signal transmitted over a channel, the signal having a noise power, the apparatus comprising:
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a preconditioning circuit comprising a first preconditioning output port and a second preconditioning output port, the first preconditioning output port corresponding to a real part of the signal, the second preconditioning output port corresponding to an imaginary part of the signal; and a logic circuit in communication with the first and second preconditioning output ports, the logic circuit comprising;
a first logic output port, a second logic output port and a third logic output port;wherein; the first logic output port provides a first value; the second logic output port provides a second value; the third logic output port provides a third value; and the first, second and third values together define an estimate of the noise power that is independent of channel transfer function estimation error. - View Dependent Claims (14, 15, 16, 17)
wherein; the first adder block is configured to add a constant to the real part of the signal; and the second adder block is configured to accumulate a sum of values in a data burst.
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15. The apparatus of claim 13 wherein the second logic output corresponds to a second logic path comprising:
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a first multiplier block in communication with the first preconditioning output port; a second multiplier block in communication with the second preconditioning output port; a third adder block configured to receive output from both the first and the second multiplier blocks; a fourth adder block configured to receive output from the third adder block and to accumulate a sum of values in a data burst.
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16. The apparatus of claim 13 wherein the third logic output corresponds to a third logic path comprising a fifth adder block in communication with the second preconditioning output port, the fifth adder block being configured to receive output from the second preconditioning output port and to accumulate a sum of values in a data burst.
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17. The apparatus of claim 13 wherein the noise power is approximately
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second value L - 1 L 2 · ( the first value + i · the third value ) 2 , wherein; L is the number of orthogonal frequency domain multiplexing symbols in a burst; and i is √
{square root over (−
1)}.
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Specification