International Journal of Information and Communication Technology Research
مجله بین المللی ارتباطات و فناوری اطلاعات
International Journal of Information and Communication Technology Research
Engineering & Technology
http://ijict.itrc.ac.ir
1
admin
2251-6107
2783-4425
doi
1652
25391
en
jalali
1392
9
1
gregorian
2013
12
1
5
4
online
1
fulltext
fa
User Capacity Scaling Laws for Fading Broadcast Channels Affected by Channel Estimation
فناوری اطلاعات
Information Technology
پژوهشي
Research
<p>It has already been shown that in rate-constrained broadcast channels, under the assumption of independent Rayleigh, Rician and Nakagami fading channels for different receivers, the user capacity (i.e. the maximum number of users that can be activated simultaneously) scales double logarithmically with the total number of users. However, to achieve the aforementioned result, it is assumed that channel state information (CSI) is perfectly known to the receivers. In practical situations, the receivers do not have access to the true CSI and they only know estimated channels. In this paper, the effects of channel estimation is analyzed on the user capacity of rate-constrained broadcast channels. In particular, the Minimum Mean Square Error (MMSE) channel estimation scheme is considered and the effects of this estimation method on the user capacity is investigated. Under the assumption of commonly used fading channels for different receivers, it is shown that the user capacity still scales double logarithmically; however, there is a gap depending on channel estimators accuracy between the upper and lower bound of the user capacity. The bound will be asymptotically tight if the variance of the channel estimator remains constant.</p>
User capacity, channel estimation, scaling laws, broadcast channels, fading channels, minimum-rate constraint, power allocation
1
7
http://ijict.itrc.ac.ir/browse.php?a_code=A-10-27-113&slc_lang=fa&sid=1
Ali
Eslami
1003194753284600376
1003194753284600376
Yes
Hengameh
Keshavarz
1003194753284600377
1003194753284600377
No