发明授权
- 专利标题: Quick detection of signaling in a wireless communication system
- 专利标题(中): 在无线通信系统中快速检测信令
-
申请号: US11228045申请日: 2005-09-15
-
公开(公告)号: US08027373B2公开(公告)日: 2011-09-27
- 发明人: Parvathanathan Subrahmanya , Thejaswi Bharadwaj Madapushi Sheshadri , Vivek Chawla
- 申请人: Parvathanathan Subrahmanya , Thejaswi Bharadwaj Madapushi Sheshadri , Vivek Chawla
- 申请人地址: US CA San Diego
- 专利权人: QUALCOMM Incorporated
- 当前专利权人: QUALCOMM Incorporated
- 当前专利权人地址: US CA San Diego
- 代理商 Howard H. Seo; Kristine U. Ekwueme
- 主分类号: H04B1/00
- IPC分类号: H04B1/00
摘要:
Quick frequency tracking (QFT), quick time tracking (QTT), and non-causal pilot filtering (NCP) are used to detect sporadically transmitted signaling, e.g., paging indicators. For QFT, multiple hypothesized frequency errors are applied to an input signal to obtain multiple rotated signals. The energies of the rotated signals are computed. The hypothesized frequency error with the largest energy is provided as a frequency error estimate. For QTT, coherent accumulation is performed on the input signal for a first set of time offsets, e.g., early, on-time, and late. Interpolation, energy computation, and non-coherent accumulation are then performed to obtain a timing error estimate with higher time resolution. For NCP, pilot symbols are filtered with a non-causal filter to obtain pilot estimates for one antenna for non-STTD and for two antennas for STTD. The frequency and timing error estimates and the pilot estimates are used to detect the signaling.
公开/授权文献
信息查询