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This paper presents a 6-bit 3.4 GS/s flash ADC in 65 nm CMOS. The proposed 4× time-domain interpolation technique allows the reduction of the number of comparators from the conventional 63 to 16 in a 6-bit flash ADC. Without extra clocking and calibration in the interpolated stage, the proposed scheme effectively achieves a 4x interpolation factor with simple SR-latches. Offset calibration is only...
In this paper, we investigate the power allocation for energy efficiency (EE) maximization in distributed antenna systems (DAS) constrained by the hybrid minimum rate requirement. The optimization problem to maximize EE is non-convex. However, an equivalent convex optimization problem can be obtained from the original non-convex optimization problem using nonlinear fractional programming. Due to the...
In this paper, the antenna location in distributed antenna system with hybrid user distribution is discussed. Instead of maximizing the cell ergodic rate, we focus on minimizing the expectation of squared distance applying selective transmission schemes. Using the weighted expectation of squared distance criterion (WESDC), the optimization problem of antenna location is proved to be convex when two...
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