CHANNEL ESTIMATION USING FREQUENCY SMOOTHING
First Claim
1. A method for supplying a frequency-smoothed communications training signal, the method comprising:
- generating a frequency-smoothed unbiased training signal in a quadrature modulation transmitter, the frequency-smoothed unbiased training signal including;
a plurality of pilot signal products;
where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier; and
,where the sum of the plurality of pilot signal products is equal to zero; and
,supplying the frequency-smoothed unbiased training signal within a single symbol period.
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Abstract
A system and method are provided for supplying a frequency-smoothed communications training signal. The method generates a frequency-smoothed unbiased training signal in a quadrature modulation transmitter. The frequency-smoothed unbiased training signal includes a plurality of pilot signal products, where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier. The sum of the plurality of pilot signal products is equal to zero. The method supplies the frequency-smoothed unbiased training signal so that it may be transmitted within a single symbol period. System and methods are also provided for using a frequency-smoothed training signal in the calculation of a receiver channel estimate.
87 Citations
64 Claims
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1. A method for supplying a frequency-smoothed communications training signal, the method comprising:
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generating a frequency-smoothed unbiased training signal in a quadrature modulation transmitter, the frequency-smoothed unbiased training signal including; a plurality of pilot signal products; where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier; and
,where the sum of the plurality of pilot signal products is equal to zero; and
,supplying the frequency-smoothed unbiased training signal within a single symbol period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for calculating a channel estimate using a frequency-smoothed unbiased training signal, the method comprising:
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accepting a frequency-smoothed unbiased training sequence in a quadrature demodulation receiver, the frequency-smoothed unbiased training sequence including a plurality of a plurality of pilot signal products; wherein each pilot signal product includes predetermined complex plane information (p) represented by a reference frequency subcarrier (f), multiplying predetermined complex plane information (pm) represented by mirror frequency subcarrier (−
f); and
,wherein the sum of the plurality of pilot signal products is equal to zero; and
,processing the frequency-smoothed unbiased training signal, generating a plurality of processed symbols (y) representing complex plane information; multiplying each processed symbol (y) by a conjugate of a corresponding reference signal (p*); and
,obtaining a frequency-smoothed channel estimate (h). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for supplying a frequency-smoothed communications training signal, the system comprising:
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a transmitter having an input to accept training information and an output to supply a quadrature modulated frequency-smoothed unbiased training signal, the frequency-smoothed unbiased training signal including; a plurality of pilot signal products; where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier; and
,where the sum of the plurality of pilot signal products is equal to zero; and
,wherein the transmitter supplies the frequency-smoothed unbiased training signal within a single symbol period. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for calculating a channel estimate using a frequency-smoothed unbiased training signal, the system comprising:
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a receiver having an input to accept a frequency-smoothed unbiased training sequence and an output to supply training information, the frequency-smoothed unbiased training sequence including a plurality of a plurality of pilot signal products; wherein each pilot signal product includes predetermined complex plane information (p) represented by a reference frequency subcarrier (f), multiplying predetermined complex plane information (pm) represented by mirror frequency subcarrier (−
f); and
,wherein the sum of the plurality of pilot signal products is equal to zero; and
,a processor having an input to accept the training information, the processor generating a plurality of processed symbols (y) representing complex plane information, multiplying each processed symbol (y) by a conjugate of a corresponding reference signal (p*), and supplying a frequency-smoothed channel estimate (h) at an output. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A machine-readable medium having stored thereon instructions for a frequency-smoothed communications training signal, the instructions comprising:
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generating a quadrature modulated frequency-smoothed unbiased training signal including; a plurality of pilot signal products; where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier; and
,where the sum of the plurality of pilot signal products is equal to zero; and
,supplying the frequency-smoothed unbiased training signal within a single symbol period.
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42. A machine-readable medium having stored thereon instructions for calculating a channel estimate using a frequency-smoothed unbiased training signal, the instructions comprising:
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accepting a frequency-smoothed unbiased training sequence in a quadrature demodulation receiver, the frequency-smoothed unbiased training sequence including a plurality of a plurality of pilot signal products; wherein each pilot signal product includes predetermined complex plane information (p) represented by a reference frequency subcarrier (f), multiplying predetermined complex plane information (pm) represented by mirror frequency subcarrier (−
f); and
,wherein the sum of the plurality of pilot signal products is equal to zero; and
,processing the frequency-smoothed unbiased training signal, generating a plurality of processed symbols (y) representing complex plane information; multiplying each processed symbol (y) by a conjugate of a corresponding reference signal (p*); obtaining a frequency-smoothed channel estimate (h).
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43. A device for supplying a frequency-smoothed communications training signal, the device comprising:
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a signal generation means having an input to accept training information and an output to supply a quadrature modulated frequency-smoothed unbiased training signal, the frequency-smoothed unbiased training signal including; a plurality of pilot signal products; where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier; and
,where the sum of the plurality of pilot signal products is equal to zero; and
,wherein the signal generation means supplies the frequency-smoothed unbiased training signal within a single symbol period. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A device for calculating a channel estimate using a frequency-smoothed unbiased training signal, the device comprising:
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a receiving means having an input to accept a frequency-smoothed unbiased training sequence and an output to supply training information, the frequency-smoothed unbiased training sequence including a plurality of a plurality of pilot signal products; wherein each pilot signal product includes predetermined complex plane information (p) represented by a reference frequency subcarrier (f), multiplying predetermined complex plane information (pm) represented by mirror frequency subcarrier (−
f); and
,wherein the sum of the plurality of pilot signal products is equal to zero; and
,a processing means having an input to accept the training information, the processing means generating a plurality of processed symbols (y) representing complex plane information, multiplying each processed symbol (y) by a conjugate of a corresponding reference signal (p*), and supplying a frequency-smoothed channel estimate (h) at an output. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A processing device for generating a frequency-smoothed unbiased training signal, the processing device comprising:
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a signal generator module having an input to accept training information and an output to supply a quadrature modulated frequency-smoothed unbiased training signal, the frequency-smoothed unbiased training signal including; a plurality of pilot signal products; where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier; and
,where the sum of the plurality of pilot signal products is equal to zero; and
,wherein the signal generator module supplies the frequency-smoothed unbiased training signal within a single symbol period.
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64. A processing device for calculating a channel estimate using a frequency-smoothed unbiased training signal, the processing device comprising:
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a receiver module having an input to accept a frequency-smoothed unbiased training sequence and an output to supply training information, the frequency-smoothed unbiased training sequence including a plurality of a plurality of pilot signal products; wherein each pilot signal product includes predetermined complex plane information (p) represented by a reference frequency subcarrier (f), multiplying predetermined complex plane information (pm) represented by mirror frequency subcarrier (−
f); and
,wherein the sum of the plurality of pilot signal products is equal to zero; and
,a calculation module having an input to accept the training information, the calculation module generating a plurality of processed symbols (y) representing complex plane information, multiplying each processed symbol (y) by a conjugate of a corresponding reference signal (p*), and supplying a frequency-smoothed channel estimate (h) at an output.
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Specification