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In this paper, we analyze the Gaussian X channel in the mixed interference regime. In this regime, multiple access transmission to one of the receivers is shown to be close to optimal in terms of sum rate. Three upper bounds are derived for the sum capacity in the mixed interference regime, and the subregions where each of these bounds dominate the others are identified. The genie-aided sum capacity...
This paper presents a multi-band receiver front-end IC in 90nm CMOS technology. The receiver front-end IC is switchable between a 5GHz front-end and a 60GHz front-end. The architecture of the receiver front-end IC is a direct conversion in 5GHz band and a superheterodyne in 60GHz band. For the miniaturization, the 5GHz and 60GHz front-ends share a variable gain amplifier for adjustment of power level...
The simple scheme of treating interference as noise (TIN) is studied in this paper for the 3 × 2 X channel. A new sum-capacity upper bound is derived. This upper bound is transformed into a generalized degrees-of-freedom (GDoF) upper bound, and is shown to coincide with the achievable GDoF of a scheme that combines TDMA and TIN for some conditions on the channel parameters. These conditions specify...
In this paper, a class of Gaussian broadcast interference channels is investigated, where one of the two broadcast users is subject to the interference coming from a point-to-point transmission. Channel parameters are categorized into three regimes. For the first two, where an ordering of the decodability of the broadcast users exists, inner bounds based on superposition and rate splitting are obtained...
A 65-nm CMOS IC containing a synthesizer, a continuous-time bandpass delta-sigma ADC and associated digital filter digitizes 200–400 MHz inputs with bandwidths up to 100 MHz. With the ADC clock supplied by the internal synthesizer, the observed phase noise on a 430-MHz carrier is −137 dBc/Hz at 750-kHz offset. The gain of the IC is adjustable over a 39-dB range using an LNA in parallel with a resistive...
We consider the linear deterministic interference channel with partial feedback, in which a given number of the top most-significant-bits of the channel outputs of the receivers are fed back to the respective transmitters. The motivation for studying this channel is that it can approximate the Gaussian interference channel with noisy feedback, i.e., additive white Gaussian noise corrupted output feedback...
A 0.12-μm SiGe phased-array Rx IC for beam-steered wireless communication in the 60-GHz band is described. It has 16 RF phase-shifting front-ends with 11° digital phase resolution and hybrid passive-active RF signal combining. It achieves 7.4-7.9 dB NF (not including 12-dB array gain) over the 4 IEEE channels. The IC has a double-conversion superheterodyne Rx core with a maximum of 72 dB of power...
The sum-rate capacity of the parallel Gaussian interference channel is studied. Sufficient conditions are derived in terms of channel coefficients and power constraints such that the sum-rate capacity can be achieved by: 1) independent transmission across sub-channels, and 2) treating interference as noise in each sub-channel. The optimal power allocation is characterized for such parallel channels.
An outer bound on the capacity region of the two-user Gaussian interference channel is derived. The bound shows that for low power and small crosstalk coefficients the sum-rate capacity is achieved by treating interference as noise. The results are generalized to multiuser channels.
A new outer bound on the capacity region of Gaussian interference channels is developed. The bound combines and improves existing genie-aided methods and is shown to give the sum-rate capacity for Gaussian interference channel with noisy interference as defined in this paper. Specifically, it is shown that if the channel coefficients and power constraints satisfy a simple condition then single-user...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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