초록 ▼

Methods and systems are provided which utilize pilots in an information sequence to periodically retrain a channel estimator. Thus, a channel tracker may be synchronized using a synchronization sequence and then periodically retrained using known pilot symbols. Furthermore, the utilization of pilots

Methods and systems are provided which utilize pilots in an information sequence to periodically retrain a channel estimator. Thus, a channel tracker may be synchronized using a synchronization sequence and then periodically retrained using known pilot symbols. Furthermore, the utilization of pilots may allow for the detection of errors in previous channel estimates. When errors are detected, a new channel estimate may be used based on the retraining using the pilot symbols and, optionally, previous errors in symbol estimation may be corrected. Thus, by retraining based on pilot symbols, the propagation of errors may be reduced.

대표청구항 ▼

1. A method of tracking channel impulse response of a signal received by a wireless device, the method comprising:estimating the channel impulse response of the received signal during a synchronizing period of a received frame; estimating the channel impulse response based on estimated symbol values

1. A method of tracking channel impulse response of a signal received by a wireless device, the method comprising:estimating the channel impulse response of the received signal during a synchronizing period of a received frame; estimating the channel impulse response based on estimated symbol values during information periods of the received frame by placing the channel tracker in decision directed mode during at least one information period of the received frame; retraining the channel impulse response during a pilot period interspersed within the received frame by placing the channel tracker in a training mode during at least one pilot period of the received frame; increasing a gain of the channel tracker when the channel tracker is placed in training mode; and decreasing the gain of the channel tracker when the channel tracker is placed in decision directed mode.