Improved Tomlinson-Harashima precoding with interference optimization

Masouros, C.; Sellathurai, Mathini; Ratnarajah, Tharmalingam

doi:10.1109/icdsp.2011.6004953

Cited by 4 publications

(1 citation statement)

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“…Moreover, the result of the QR factorization is that one of the users experiences no interference, while causing interference to all remaining users. Based on this observation, [10] optimizes the amplitude only of this user so that the resulting interference experienced by the rest of the users is moved closer to one of the replicas of the desired constellation points. By doing so, the required power to cancel the interference, and hence the precoding power loss, is reduced.…”

Section: Introductionmentioning

confidence: 97%

Complex interference optimization for power loss reduction in MIMO-THP transmission

Masouros

Sellathurai

Ratnarajah

et al. 2011

2011 Conference Record of the Forty Fifth Asilomar Conference on Signals, Systems and Computers (ASILOMAR)

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Power loss is one of the major drawbacks in multiple input multiple output Tomlinson Harashima precoding (MIMO-THP) schemes. In this work we explore the potential of alleviating this by optimizing the interference to be canceled. Since both the desired and interfering signals originate from the base station (BS) of the downlink system, the resulting interference can be influenced to reduce the transmission power required to cancel it, without altering the information content of the downlink message. The aim is to bring the interference closer to the replica of the desired symbol in the modulo-extended constellation. By doing so, the quantized distance between the useful signal and interference is reduced and therefore the power required to pre-subtract interference is decreased. The presented analysis and results show a considerable transmit power reduction with the proposed technique compared to conventional MIMO-THP for both zero forcing (ZF) and minimum mean squared error (MMSE) approaches.

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Section: Introductionmentioning

confidence: 97%