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Tree Based Lookahead Sigma Delta Modulators

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This paper describes lookahead Sigma-Delta Modulation (SDM) systems based on tree searching. It presents several methods of implementing tree searched SDM. In particular, it looks at ways of making the search more efficient so that significant amounts of lookahead can be achieved. Finally, it compares tree searching to the Viterbi algorithm and demonstrates the computational and implementation advantages tree searching can offer.

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