SNR Dependent Channel Tracking For SUN OFDM
First Claim
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1. An orthogonal frequency-division multiplexed (OFDM)-based receiver for channel tracking with signal-to-noise ratio dependent parameters, comprising:
- a memory; and
a signal processor, coupled to the memory, to estimate a signal-to-noise ratio (SNR) for a received packet of OFDM symbols and determine an SNR region in which the SNR estimate falls, wherein the signal processor implements a different set of finite impulse response (FIR) filter coefficients for each SNR region.
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Abstract
An orthogonal frequency-division multiplexed (OFDM)-based receiver for channel tracking with signal-to-noise ratio dependent parameters that includes a memory; and a signal processor, coupled to the memory. The signal processor to estimate a signal-to-noise ratio (SNR) for a received packet of OFDM symbols and determine an SNR region in which the SNR estimate falls, wherein the signal processor implements a different set of finite impulse response (FIR) filter coefficients for each SNR region.
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Citations
20 Claims
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1. An orthogonal frequency-division multiplexed (OFDM)-based receiver for channel tracking with signal-to-noise ratio dependent parameters, comprising:
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a memory; and a signal processor, coupled to the memory, to estimate a signal-to-noise ratio (SNR) for a received packet of OFDM symbols and determine an SNR region in which the SNR estimate falls, wherein the signal processor implements a different set of finite impulse response (FIR) filter coefficients for each SNR region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A smart utility network device, comprising:
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a receiver configured to receive orthogonal frequency-division multiplexed (OFDM) symbols; and a signal processor coupled to the receiver, the signal processor configured to; estimate a signal-to-noise ratio (SNR) of a packet of OFDM signals based on a long training field (LTF) symbol included in the OFDM packet; determine a SNR region in which the SNR estimate falls, wherein there are at least two SNR regions and each SNR region is associated with a set of finite impulse response (FIR) filter coefficients and a forgetting factor; and based on the SNR region, generate estimates of a channel gain for each tone of each OFDM symbol in the OFDM packet with the SNR region'"'"'s associated FIR filter coefficients and the forgetting factor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for signal-to-noise ratio (SNR) dependent channel gain tracking of an orthogonal frequency-domain multiplexing (OFDM)-based receiver, comprising:
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receiving, by a receiver, a packet of OFDM symbols, wherein a preamble of the packet includes a long training field (LTF) symbol; estimating, by the receiver, a SNR value with the LTF symbol; determining, by the receiver, a SNR region in which the SNR estimate falls; and generating, by the receiver, estimates of a channel gain for tones of the OFDM symbols based on a set of finite impulse response (FIR) filter coefficients associated with the SNR region and smoothing the tones of the OFDM symbols along a time-domain using a forgetting factor associated with the SNR region. - View Dependent Claims (19, 20)
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Specification