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|Title:||Open-loop tanlock carrier recovery structure for BPSK and its performance|
|Authors:||Kam, Pooi Yuen|
|Source:||Kam, Pooi Yuen (1995). Open-loop tanlock carrier recovery structure for BPSK and its performance. IEEE Communication Theory Mini-Conference, Proceedings, CTMC : 177-181. ScholarBank@NUS Repository.|
|Abstract:||The tanlock carrier recovery structure has been shown to be the low SNR approximation to the optimum ML carrier phase estimator for a carrier with linear data modulations such as MPSK. It has long been known to have better performance than a Costas' loop or a squarer/PLL for BPSK, because its tangent-function phase detector characteristic has an extended linear range compared to the sine-function phase detector characteristic of the latter loops. Its implementation in conventional closed-loop form, however, requires the use of a divider which suffers from the problem of output overflow when the input divisor signal becomes very small. We suggest here an open-loop implementation which does not require the use of a divider and a VCO. The operational and performance advantages of this open-loop implementation over the conventional closed-loop implementation are pointed out. Some sample BER results for a coherent receiver employing this open-loop tanlock carrier recovery system are obtained via computer simulations. The results show that the receiver achieves significant performance gains over differential detection.|
|Source Title:||IEEE Communication Theory Mini-Conference, Proceedings, CTMC|
|Appears in Collections:||Staff Publications|
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