Equalizer coefficient determination in the frequency domain for MIMO/MISO radio
First Claim
1. A method for operating a Radio Frequency (RF) receiver comprising:
- receiving a merged information signal that includes a first information signal and a second information signal, each of the first and second information signals having time domain training symbols and data symbols;
processing the first information signal time domain training symbols and the second information signal time domain training symbols to produce a first information signal time domain channel estimate and a second information signal time domain channel estimate;
converting the first information signal time domain channel estimate and the second information signal time domain channel estimate to the frequency domain to produce a first information signal frequency domain channel estimate and a second information signal frequency domain channel estimate, respectively;
producing first frequency domain equalizer coefficients and second frequency domain equalizer coefficients based upon the first information signal frequency domain channel estimate and the second information signal frequency domain channel estimate;
converting the first frequency domain equalizer coefficients and the second frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients and second time domain equalizer coefficients, respectively;
equalizing the merged information signal time using the first time domain equalizer coefficients to produce equalized first information signal data symbols; and
equalizing the merged information signal time using the first time domain equalizer coefficients to produce equalized second information signal data symbols.
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Abstract
A Radio Frequency (RF) receiver includes a RF front end and a baseband processing module coupled to the RF front end that is operable to receive a time domain signal that includes multiple information signals, each having training symbols and time domain data symbols. The baseband processing module includes a channel estimator that processes the training symbols to produce respective time domain channel estimates, a Fast Fourier Transformer converts the time domain channel estimates to the frequency domain to produce frequency domain channel estimates, a weight calculator operable to produce frequency domain equalizer coefficients based upon the frequency domain channel estimates, an Inverse Fast Fourier Transformer operable to convert the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients, and an equalizer operable to equalize the time domain data symbols using the time domain equalizer coefficients. The RF receiver supports STTD, MISO, and MIMO operations.
25 Citations
25 Claims
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1. A method for operating a Radio Frequency (RF) receiver comprising:
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receiving a merged information signal that includes a first information signal and a second information signal, each of the first and second information signals having time domain training symbols and data symbols; processing the first information signal time domain training symbols and the second information signal time domain training symbols to produce a first information signal time domain channel estimate and a second information signal time domain channel estimate; converting the first information signal time domain channel estimate and the second information signal time domain channel estimate to the frequency domain to produce a first information signal frequency domain channel estimate and a second information signal frequency domain channel estimate, respectively; producing first frequency domain equalizer coefficients and second frequency domain equalizer coefficients based upon the first information signal frequency domain channel estimate and the second information signal frequency domain channel estimate; converting the first frequency domain equalizer coefficients and the second frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients and second time domain equalizer coefficients, respectively; equalizing the merged information signal time using the first time domain equalizer coefficients to produce equalized first information signal data symbols; and equalizing the merged information signal time using the first time domain equalizer coefficients to produce equalized second information signal data symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating a Radio Frequency (RF) receiver comprising:
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receiving a merged information signal that includes a first information signal and a second information signal, each of the first and second information signals having time domain training symbols and data symbols; for each of at least two diversity paths; processing the first information signal time domain training symbols and the second information signal time domain training symbols to produce a first information signal time domain channel estimate and a second information signal time domain channel estimate; converting the first information signal time domain channel estimate and the second information signal time domain channel estimate to the frequency domain to produce a first information signal frequency domain channel estimate and a second information signal frequency domain channel estimate, respectively; producing first frequency domain equalizer coefficients and second frequency domain equalizer coefficients based upon the first information signal frequency domain channel estimate and the second information signal frequency domain channel estimate; converting the first frequency domain equalizer coefficients and the second frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients and second time domain equalizer coefficients, respectively; equalizing the merged information signal time using the first time domain equalizer coefficients to produce equalized first information signal data symbols; and equalizing the merged information signal time using the second time domain equalizer coefficients to produce equalized second information signal data symbols; combining equalized first information signal data symbols from the at least two diversity paths; and combining equalized second information signal data symbols from the at least two diversity paths. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A Radio Frequency (RF) receiver operable upon a merged information signal that includes a first information signal and a second information signal, each of the first and second information signals having time domain training symbols and data symbols, the RF receiver comprising:
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a RF front end; and a baseband processing module coupled to the RF front end and comprising; at least one channel estimator operable to process the first information signal time domain training symbols and the second information signal time domain training symbols to produce a first information signal time domain channel estimate and a second information signal time domain channel estimate; at least one Fast Fourier Transformer operable to transform the first information signal time domain channel estimate and the second information signal time domain channel estimate to the frequency domain to produce a first information signal frequency domain channel estimate and a second information signal frequency domain channel estimate, respectively; a weight calculator operable to produce first frequency domain equalizer coefficients and second frequency domain equalizer coefficients based upon the first information signal frequency domain channel estimate and the second information signal frequency domain channel estimate; at least one Inverse Fast Fourier Transformer operable to transform the first frequency domain equalizer coefficients and the second frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients and second time domain equalizer coefficients, respectively; and at least one equalizer operable to equalize the merged information signal time using the first time domain equalizer coefficients to produce equalized first information signal data symbols and to equalize the merged information signal time using the first time domain equalizer coefficients to produce equalized second information signal data symbols. - View Dependent Claims (19, 20, 21)
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22. A Radio Frequency (RF) receiver operable upon first and second merged information signals, each including a first information signal and a second information signal, each of the first and second information signals having time domain training symbols and data symbols, the RF receiver comprising:
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a RF front end; and a baseband processing module coupled to the RF front end comprising; a first diversity path operable to; produce a first information signal time domain channel estimate from the first merged information signal and convert the first information signal time domain channel estimate to the frequency domain to produce a first information signal frequency domain channel estimate; and produce a second information signal time domain channel estimate from the first merged information signal and convert the second information signal time domain channel estimate to the frequency domain to produce a second information signal frequency domain channel estimate; a second diversity path operable to; produce a first information signal time domain channel estimate from the second merged information signal and convert the first information signal time domain channel estimate to the frequency domain to produce a first information signal frequency domain channel estimate; and produce a second information signal time domain channel estimate from the second merged information signal and convert the second information signal time domain channel estimate to the frequency domain to produce a second information signal frequency domain channel estimate; an equalizer weight calculation module operable to produce first frequency domain equalizer coefficients, second frequency domain equalizer coefficients, third frequency domain equalizer coefficients, and fourth frequency domain equalizer coefficients based upon the first information signal frequency domain channel estimate of the first diversity path, the second information signal frequency domain channel estimate of the first diversity path, the first information signal frequency domain channel estimate of the second diversity path, the second information signal frequency domain channel estimate of the second diversity path; the first diversity path further operable to; convert the first frequency domain equalizer coefficients to the time domain to produce first time domain equalizer coefficients; equalize the first merged information signal using the first time domain equalizer coefficients; and equalize the first merged information signal using the second time domain equalizer coefficients; the second diversity path further operable to; convert the second frequency domain equalizer coefficients to the time domain to produce second time domain equalizer coefficients; equalize the second merged information signal using the third time domain equalizer coefficients; and equalize the second merged information signal using the fourth time domain equalizer coefficients. - View Dependent Claims (23, 24, 25)
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Specification