CYCLIC SHIFT DELAY DETECTION USING A CLASSIFIER

摘要

Systems, apparatus and methods for determining a cyclic shift delay (CSD) mode from a plurality of CSD modes is disclosed. A received OFDM signal is converted to a channel impulse response (CIR) signal in the time domain and/or a channel frequency response (CFR) signal in the frequency domain. Matched filters and a comparator are used to determine a most likely current CSD mode. Alternatively, a classifier is used with a number of inputs including outputs from two or more matched filters and one or more outputs from a feature extractor. The feature extractor extracts features in the time domain from the CIR signal and/or in the frequency domain from the CFR signal useful in distinguishing various CSD modes.

主权项

1. A method in a mobile device for determining a cyclic shift delay (CSD) mode from a plurality of CSD modes, the method comprising:
receiving an orthogonal frequency division multiplex (OFDM) signal; computing a channel impulse response (CIR) of the OFDM signal; match filtering the CIR with a first CSD mode from the plurality of CSD modes to produce a first output; match filtering the CIR with a second CSD mode from the plurality of CSD modes to produce a second output; and determining the CSD mode from a maximum of the first output and second output.