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A fine symbol timing recovery (F-STR) algorithm with near timing-jitter free is proposed, which includes three parts: A Gardner TR circuit with a new- designed pre-filter as a ppm searcher, a high-order interpolation as an ideal re-sampler, and a segment sync or frame sync based STR circuit as an offset compensator. It can provide a near timing-jitter free property and its complexity can be further simplified by combining the last two units as one. Simulation results show that the proposed fine STR scheme is robust to noise and echoes. With a comparable complexity compared with previous arts, the proposed fine STR algorithm could give about 0.2 dB enhancements in terms oj symbol error rates (SER) and low bound of convergence can be improved by over I dB for Brazil B channel. Using the F-STR algorithm, receivers become feasible with large timing errors and severe echoes'.
Date of Publication: May 2007