Citation
Abstract
The linearized tracking errors of three Manchester (biphase-coded) symbol tracking loops are compared to determine which is appropriate for Block V receiver applications. The first is a nonreturn-to-zero (NRZ) symbol synchronizer loop operating at twice the symbol rate (NRZ x 2) so that it operates on half-symbols. The second near optimally processes the mid-symbol transitions and ignores the between-symbol transitions. In the third configuration, the first two approaches are combined as a hybrid to produce the best performance. Although this hybrid loop is the best at low symbol signal-to-noise ratios (SNRs), it has about the same performance as the NRZ x 2 loop at higher SNRs (> 0-dB Es/No). Based on this analysis, it is tentatively recommended. that the hybrid loop be implemented for Manchester data in the Block V receiver. However, the high data rate case and the hardware implications of each implementation must be understood and analyzed before the hybrid loop is recommended unconditionally.
Details
- Volume
- 42-104
- Published
- February 15, 1991
- Pages
- 175–191
- File Size
- 526.3 KB