Coherent and noncoherent decoding metrics for the is‐95 reverse link

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Abstract
The IS‐95 [1] reverse link modulation chain consists of a rate 1/3 convolutional code, a bit‐level interleaver, and 64‐ary orthogonal modulator. The interleaver improves the performance of the convolutional code by intreducing time diversity. However, calculation of the log‐likelihood ratio for the combination of bil‐level interleaving and 64‐ary orthogonal modulation is difficult and may require detailed knowledge of the channel fading process. Several decoding metrics have teen published in me literature including the single‐ and dual‐max metrics [2, 3], This paper presents two decoding metrics, the weighted dual‐max and the coherent dual‐max, which are non‐parametric, reasonable in complexity, and which improve on die performance of the dual‐max by 0.3 dB and 1.5 dB respectively.

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