Second-Order cyclostationarity of cyclically prefixed single carrier linear digital (CP-SCLD) modulations with applications to signal recognition

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Authors
  1. Dobre, O.A.
  2. Zhang, Q.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
In this report, we investigate signal cyclostationarity to blindly identify single carrier linear digital (SCLD), cyclically prefixed single carrier linear digital (CP-SCLD) and orthogonal frequency division multiplexing (OFDM) modulations. Signal cyclostationarity has been investigated by our group to discriminate SCLD against OFDM modulations earlier. The second-order (one-conjugate) cyclic cumulant (CC) of the received baseband signal has been exploited as discriminating feature in the earlier report. It was also reported that the magnitude of the CC corresponding to the OFDM signal exhibits peaks at zero cyclic frequency (CF) and delays associated with the cyclic prefix (CP), where as no such peaks appear for SCLD signals. However, the algorithm failed in discriminating CP-SCLD, as the existence of the cyclic prefix (CP) leads to the same behaviour of the CC magnitude at zero CF and delays associated to CP as for the OFDM signal. This results in misclassification of CP-SCLD signals as OFDM signals. To fix this issue, we derive the analytical closed-form expression for the second-order (one-conjugate) CC of CP-SCLD signals, and investigate its applicability to recognize this signal type against SCLD and OFDM. We extend the previously mentioned secondorder cyclostationarity-based algorithm developed by our group to include CP-SCLD into the pool for recognition, in addition to SCLD and OFDM.

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Report Number
DRDC-OTTAWA-CR-2009-299 — Contractor Report
Date of publication
01 Apr 2010
Number of Pages
62
DSTKIM No
CA033914
CANDIS No
533395
Format(s):
Electronic Document(PDF)

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