Invention Grant
US08406319B2 Channel estimator with high noise suppression and low interpolation error for OFDM systems
有权
OFDM系统具有高噪声抑制和低内插误差的信道估计器
- Patent Title: Channel estimator with high noise suppression and low interpolation error for OFDM systems
- Patent Title (中): OFDM系统具有高噪声抑制和低内插误差的信道估计器
-
Application No.: US11691494Application Date: 2007-03-27
-
Publication No.: US08406319B2Publication Date: 2013-03-26
- Inventor: Krishna Kamal Sayana , Bryan S. Nollett , Xiangyang Zhuang
- Applicant: Krishna Kamal Sayana , Bryan S. Nollett , Xiangyang Zhuang
- Applicant Address: US IL Libertyville
- Assignee: Motorola Mobility LLC
- Current Assignee: Motorola Mobility LLC
- Current Assignee Address: US IL Libertyville
- Main IPC: H04K1/10
- IPC: H04K1/10

Abstract:
A receiver with DFT based channel estimation having good noise suppression for both high and low signal-to-noise ratios providing advantages over conventional DFT estimators and Minimum-Mean-Square-Error (MMSE) estimators. The use of MMSE may be incorporated for estimation at the band edges providing further improvements. The received signal in the time domain, is transformed to the frequency-domain received signal via an N-point FFT (501). The frequency-domain received signal at the pilot locations is then used to obtain a “noisy” channel estimates at the pilot subcarriers by dividing the known pilot symbols in (503). Uniformly spaced pilots are assumed over a window of usable subcarriers. Padding is applied to the initial channel estimates at both sides of the band to account for unused subcarriers such as guard spacing. Weighting factors during power estimation may take into account various noise characteristics such as combinations of known and time-limited noise power characteristics.
Public/Granted literature
- US20120195397A1 CHANNEL ESTIMATOR WITH HIGH NOISE SUPPRESSION AND LOW INTERPOLATION ERROR FOR OFDM SYSTEMS Public/Granted day:2012-08-02
Information query