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US09071493B2 Dual frequency tracking loop for OFDMA systems 有权
用于OFDMA系统的双频跟踪环路

Dual frequency tracking loop for OFDMA systems
Abstract:
Methods and apparatus for correcting frequency errors between a carrier frequency of a signal received by a wireless device and a reference frequency local to the device. For certain aspects, such a method generally includes receiving a signal in a receiver having an LO producing a reference frequency, a radio frequency (RF) phase-locked loop (PLL), and a digital rotator, estimating a frequency difference between a carrier frequency of the received signal and the LO reference frequency, and applying the estimated frequency difference to the RF PLL and the digital rotator.
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