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.