OFDM system with reverse link interference estimation
AssigneeApple Inc.
InventorsJianming Wu, Wen Tong, Peiying Zhu
Life of this patent
Estimating the term…
Abstract
A new method of performing interference estimation to allow the data packets to be efficiently delivered in an OFDM system. The interference estimation is performed on average over each frame for each mobile station individually in both frequency and time domains. Based on the estimated interference, the CIR can be determined by the BTS based on channel response estimates made by the BTS, or by the MS based on channel response estimates made for the uplink assuming a symmetrical channel. Numerical results show that the CIR estimation error could be very small if a sub-channel is considered as the minimum transmission unit. In terms of the aggregate throughput, the interference estimation method can provide a significant gain.
Claims20
A method, comprising:
- determining an interference estimate of an interference component of a first Orthogonal Frequency Division Multiplexed (OFDM) signal received on a first set of subcarriers associated with a mobile station;
- determining a channel response estimate of a second OFDM signal received on a second set of subcarriers associated with the mobile station, wherein the first set of subcarriers is different from the second set of subcarriers;
- and
- estimating a carrier-to-interference ratio (CIR) for the mobile station based on the interference estimate and the channel response estimate.
A mobile station, comprising:
- wireless communication circuitry configured to perform wireless communication with a base station;
- and
- processing hardware coupled to the wireless communication circuitry, wherein the processing hardware is configured to operate with the wireless communication circuitry to:
- determine an interference estimate of an interference component of a first Orthogonal Frequency Division Multiplexed (OFDM) signal received on a first set of subcarriers associated with a mobile station;
- determine a channel response estimate of a second OFDM signal received on a second set of subcarriers associated with the mobile station, wherein the first set of subcarriers is different from the second set of subcarriers;
- and
- estimate a carrier-to-interference ratio (CIR) for the mobile station based on the interference estimate and the channel response estimate.
A non-transitory computer accessible memory medium storing program instructions for estimating a carrier-to-interference ratio (CIR) in an OFDM system, wherein the program instructions are executable by a processor to:
- determine an interference estimate of an interference component of a first Orthogonal Frequency Division Multiplexed (OFDM) signal received on a first set of subcarriers associated with a mobile station;
- determine a channel response estimate of a second OFDM signal received on a second set of subcarriers associated with the mobile station, wherein the first set of subcarriers is different from the second set of subcarriers;
- and
- estimate a carrier-to-interference ratio (CIR) for the mobile station based on the interference estimate and the channel response estimate.
Dependencies are inferred from the claim text.