Abstract
In a high-speed mobile communications network, it is desirable to off-load as much hardware complexity as possible from mobile terminals to the base station. A system architecture is presented where all equalization-related computations, requiring most hardware resources, can be performed at the base station. A conventional decision-feedback equalizer (DFE) is used to equalize the received transmissions, and a modified Tomlinson–Harashima precoding method (Tx-THP) is applied to pre-equalize the transmitted data sequence. The Tx-THP scheme can also be extended to differentially coherent detection, to suit the systems where perfect frequency synchronization is not available. A modified DQPSK receiver is presented to process the extended constellations. To avoid the side effect of severe noise multiplication, an alternative receiver structure is developed, incorporating a discrete-time phase tracker to allow the reduction of the constellation size prior to the correlation operation. With a 2nd-order estimator filter, this receiver approaches the performance of coherent detection for Tx-THP.
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