Hong Kong Applied Science and Technology Research Institute Company, Limited

Kai Zhang

Henry Hui Ye

Cheng Wang

This invention describes method and apparatus for automatic gain control (AGC) for a TD-LTE system, taking into consideration the TD-LTE frame structure. In one embodiment, an AGC method comprises: adjusting RF gain for subframe j (where 0&#x3c;=j&#x3c;=9) in a radio frame according to an average peak signal power of subframe j in previous radio frames when a terminal is lack of information in downlink timing and in uplink/downlink configuration; computing a first average signal power in one or more downlink subframes as received from at least one base station when the terminal has information in downlink timing but is lack of information in uplink/downlink configuration; and computing a second average signal power in one or more downlink subframes as received from at least one base station when the terminal has information in downlink timing and in uplink/downlink configuration.

Method and apparatus for automatic gain control in a TD-LTE system

The present invention relates to a method of channel estimation comprising two major steps. The first step is the least-squared and minimum mean-square error (MMSE) estimations on the pilot resource elements to generate the channel response estimates at the predefined pilot locations. The second step of the channel estimation, which utilizes the results from the first step to compute the channel response estimates for the remaining resource elements, comprises the following three operations: (i) averaging of each pair of adjacent pilot resource elements in the frequency direction to obtain the channel response estimate of the resource element in the middle of those two pilot resource elements; (ii) MMSE interpolation in the time domain for all the sub-carriers containing pilot signals; and (iii) linear interpolation in the frequency direction for all the sub-carriers not containing any pilot signals.

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Hong Kong, China

Kai Zhang