Jointly Adaptive Equalization and Carrier Recovery in Two‐Dimensional Digital Communication Systems
In this paper, we describe a novel receiver structure for two‐dimensional‐modulated, suppressed‐carrier data signals. The receiver consists of a passband equalizer followed by a demodulator which compensates for frequency offset and phase jitter; the demodulator's phase angle is provided by a data‐directed, carrier recovery loop, which is shown by analysis and simulation to be capable of tracking relatively high frequency phase jitter. A derivation of the receiver parameters is presented, based on a gradient algorithm for jointly optimizing the equalizer tap coefficients and the carrier phase estimate, to minimize the output mean‐squared error. System performance is related to carrier phase‐tracking parameters by analysis. Computer simulations confirm the feasibility of the receiver structure.
|Journal||Bell System Technical Journal|
Falconer, D.D. (1976). Jointly Adaptive Equalization and Carrier Recovery in Two‐Dimensional Digital Communication Systems. Bell System Technical Journal, 55(3), 317–334. doi:10.1002/j.1538-7305.1976.tb03317.x