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A channel that heats up
 in Proceedings of the 2007 IEEE Symposium on Information Theory
, 2007
"... Abstract — Motivated by onchip communication, a channel model is proposed where the variance of the additive noise depends on the weighted sum of the past channel input powers. For this channel, an expression for the capacity per unit cost is derived, and it is shown that the expression holds also ..."
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Cited by 18 (5 self)
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Abstract — Motivated by onchip communication, a channel model is proposed where the variance of the additive noise depends on the weighted sum of the past channel input powers. For this channel, an expression for the capacity per unit cost is derived, and it is shown that the expression holds also in the presence of feedback. I.
On the spectral efficiency of noncoherent doubly selective channels
 In Proc. Allerton Conf. Commun., Control, and Computing
, 2006
"... In this paper, we consider noncoherent singleantenna communication over doubly selective blockfading channels that obey a complexexponential basis expansion model. In our noncoherent setup, neither the transmitter nor the receiver know the channel fading coefficients, though both know the channel ..."
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Cited by 11 (6 self)
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In this paper, we consider noncoherent singleantenna communication over doubly selective blockfading channels that obey a complexexponential basis expansion model. In our noncoherent setup, neither the transmitter nor the receiver know the channel fading coefficients, though both know the channel statistics. First, we show that, when the inputs are chosen from continuous distributions, the achievable spectral efficiency (i.e., the prelog factor in the channel capacity expression) equals max(0, 1− NdelayNDopp/N), where N, Ndelay, and NDopp denote the channel’s discrete blockfading interval, discrete delay spread, and discrete Doppler spread, respectively. Next, we study pilotaided transmission (PAT) over this channel. In the case of strictly doubly selective fading (i.e., NDopp> 1 and Ndelay> 1), we establish that affine minimum meansquared error (MMSE) PAT schemes are spectrally inefficient, but we provide guidelines for the design of spectrally efficient affine PAT schemes and give an example of one such scheme. Index Terms — Noncoherent channels, doubly selective channels, doubly dispersive channels, noncoherent communication, spectral efficiency, channel capacity, achievable rates, pilot symbols, training symbols, channel estimation. I.
On the Sensitivity of ContinuousTime Noncoherent Fading Channel Capacity
, 2012
"... The noncoherent capacity of stationary discretetime fading channels is known to be very sensitive to the fine details of the channel model. More specifically, the measure of the support of the fadingprocess power spectral density (PSD) determines if noncoherent capacity grows logarithmically in S ..."
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Cited by 3 (3 self)
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The noncoherent capacity of stationary discretetime fading channels is known to be very sensitive to the fine details of the channel model. More specifically, the measure of the support of the fadingprocess power spectral density (PSD) determines if noncoherent capacity grows logarithmically in SNR or slower than logarithmically. Such a result is unsatisfactory from an engineering point of view, as the support of the PSD cannot be determined through measurements. The aim of this paper is to assess whether, for general continuoustime Rayleighfading channels, this sensitivity has a noticeable impact on capacity at SNR values of practical interest. To this end, we consider the general class of bandlimited continuoustime Rayleighfading channels that satisfy the widesense stationary uncorrelatedscattering (WSSUS) assumption and are, in addition, underspread. We show that, for all SNR
A Tradeoff between Rich Multipath and High Receive Power in MIMO Capacity
"... A discussion about which of the two factors, rich multipath (in NLOS) or signaltonoise ratio (SNR) (usually in LOS), affects the MultipleInput MultipleOutput (MIMO) channel capacity more is presented in this paper. is interesting discussion is investigated by performing simulations using simpl ..."
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A discussion about which of the two factors, rich multipath (in NLOS) or signaltonoise ratio (SNR) (usually in LOS), affects the MultipleInput MultipleOutput (MIMO) channel capacity more is presented in this paper. is interesting discussion is investigated by performing simulations using simple circle scatterer model and WINNER II channel model. And the simulation shows that these two factors behave differently as the channel condition varyies. When the scatterer number in channel is low, the high receive SNR is more important to capacity. e multipath richness will have greater in�uence when the scatterer number exceeds a certain threshold. However, the channel capacity will not change much as the scatterers continue to increase.
On the Spectral Efficiency of Noncoherent 1 Doubly Selective BlockFading Channels
, 2010
"... In this paper, we consider noncoherent singleantenna communication over doubly selective blockfading channels with discrete blockfading interval N. In our noncoherent setup, neither the transmitter nor the receiver know the channel fading coefficients, though both know the channel statistics. In p ..."
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In this paper, we consider noncoherent singleantenna communication over doubly selective blockfading channels with discrete blockfading interval N. In our noncoherent setup, neither the transmitter nor the receiver know the channel fading coefficients, though both know the channel statistics. In particular, we consider discretetime channels whose impulseresponse trajectories obey a complexexponential basis expansion model with uncorrelated coefficients, and we show that such a model holds in the limit N → ∞ for pulseshaped transmission/reception over certain widesense stationary uncorrelated scattering channels. First, we show that, when the inputs are chosen from continuous distributions, the channel’s multiplexing gain (i.e., capacity prelog factor) equals max(0,1 − NdelayNDopp/N), for discrete delay spread Ndelay and discrete Doppler spread NDopp. Next, for the case of strictly doubly selective fading (i.e., NDopp> 1 and Ndelay> 1), we establish that, for cyclicprefixed affine pilotaided transmission (PAT) schemes designed to minimize the meansquared error (MSE) attained by pilotaided minimumMSE channel estimation, the prelog factor of the achievable rate is less than the channel’s multiplexing gain. We then provide guidelines for the design of PAT schemes whose achievablerate prelog factor equals the channel’s multiplexing gain and construct an example. Index Terms — Achievable rate, channel capacity, channel estimation, doubly dispersive, doubly selective, multiplexing gain, noncoherent, pilots, spectral efficiency, training. I.