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“…Using a similar channel model as in [4], Médard [9] has obtained explicit upper bound on the achievable mutual information for direct-sequence CDMA signals and showed the similar conclusion that the mutual information goes to zero as the bandwidth gets large. Subsequent to the conference version of this work [11], Hajek and Subramanian [5] have obtained more recent results by applying the theory of capacity and reliability function per unit cost [3], [13] to related problems. By using a certain "fourthegy" of the signal as a cost measure (related to the fourth moment), they showed that the mutual information achieved by spread-spectrum signals in fading channels is small because their fourthegy is small.…”

confidence: 99%

“…Using a similar channel model as in [4], Médard [9] has obtained explicit upper bound on the achievable mutual information for direct-sequence CDMA signals and showed the similar conclusion that the mutual information goes to zero as the bandwidth gets large. Subsequent to the conference version of this work [11], Hajek and Subramanian [5] have obtained more recent results by applying the theory of capacity and reliability function per unit cost [3], [13] to related problems. By using a certain "fourthegy" of the signal as a cost measure (related to the fourth moment), they showed that the mutual information achieved by spread-spectrum signals in fading channels is small because their fourthegy is small.…”

confidence: 99%