Channel profile estimation for OFDM-based communication system
AssigneeAmicus Wireless Technology Ltd.
InventorsKee-Bong Song, Won-Joon Choi
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Abstract
A device and method for performing a channel profile estimation for an OFDM-based wireless communication system uses an averaged frequency coherence metric to select a particular channel profile, which is a current channel profile estimate. The averaged frequency coherence metric is derived using correlations between pilot subcarriers of an OFDM-based signal at predefined subcarrier locations for multiple frames of the OFDM-based signal. The selected channel profile may be used for channel estimation, as well as for link adaptation, to improve the performance of these processes.
Claims21
A method for performing a channel profile estimation for an OFDM-based wireless communication system, the method comprising:
- receiving frames of an OFDM-based signal;
- computing an instantaneous frequency coherence metric for a selected frame of the OFDM-based signal using pilot subcarriers at predefined pilot subcarrier locations, the instantaneous coherence metric providing correlation information between the pilot subcarriers in the selected frame, wherein the instantaneous frequency coherence metric is a single value;
- averaging multiple instantaneous frequency coherence metrics for corresponding multiple frames of the OFDM-based signal to produce an averaged coherence metric, the averaged coherence metric indicating average channel statistics;
- and
- selecting a particular channel profile from a plurality of channel profiles using the averaged coherence metric, the particular channel profile being a current channel profile estimate.
A device for performing a channel estimation for an OFDM-based wireless communication system, the device comprising:
- a frequency coherence metric computation unit configured to compute an instantaneous frequency coherence metric for a selected frame of a OFDM-based signal using pilot subcarriers at predefined pilot subcarrier locations, the instantaneous frequency coherence metric providing correlation information between the pilot subcarriers in the selected frame, wherein the instantaneous frequency coherence metric is a single value;
- a metric averaging unit operably connected to the frequency coherence metric computation unit, the metric averaging unit being configured to average multiple instantaneous frequency coherence metrics for corresponding multiple frames of the OFDM-based signal to produce an averaged coherence metric, the averaged coherence metric indicating average channel statistics;
- and
- a profile selection logic operably connected to the metric averaging unit, the profile selection logic being configured to select a particular channel profile from a plurality of channel profiles using the averaged coherence metric, the particular channel profile being a current channel profile estimate.
A method for performing a channel estimation for an OFDM-based wireless communication system, the method comprising:
- receiving frames of an OFDM-based signal;
- computing an instantaneous frequency coherence metric for a selected frame of the OFDM-based signal using pilot subcarriers at predefined pilot subcarrier locations, the instantaneous frequency coherence metric providing correlation information between the pilot subcarriers in the selected frame, wherein the instantaneous frequency coherence metric is a single value;
- averaging multiple instantaneous frequency coherence metrics for corresponding multiple frames of the OFDM-based signal to produce an averaged coherence metric, the averaged coherence metric indicating average channel statistics;
- selecting a particular channel profile from a plurality of channel profiles using the averaged coherence metric, the particular channel profile being a current channel profile estimate;
- computing estimated pilot channel estimates using the pilot subcarriers of the OFDM-based signal;
- and
- interpolating the pilot channel estimates based on the particular channel profile to derive data channel estimates for data subcarriers of the OFDM-based signal.
Dependencies are inferred from the claim text.