A signal space detector is a low-complexity approximation of fixed-delay tree search with decision feedback (FDTS/DF). This paper proposes the simplest version possible of a τ = 2 FDTS/DF for a minimum run-length constraint of d = 2. The hardware needs only two multiplications and additions, facilitating high data-rate/low-complexity implementations. Simulation results show that the performance of the proposed detector equals that of the τ = 2 FDTS/DF even when jitter noise is present. It is shown that for d = 2, a partial response maximum-likelihood detector with the target response {sum from k=0 to k=3 of D{sup}k} outperforms one with (1 + D){sup}3 because of good spectral matching at normalized density S ≥ 4.6.
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