System capacity of F-TDMA cellular systems

被引:14
作者
Caire, G [2 ]
Knopp, R
Humblet, P
机构
[1] Politecn Torino, I-10129 Turin, Italy
[2] Inst Eurecom, Mobile Commun Grp, F-06904 Sophia Antipolis, France
关键词
block-interference and block-fading channels; cellular systems; information outage probability;
D O I
10.1109/26.737403
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We study the system capacity of cellular systems with time-division multiple access, slow time-frequency hopping (F-TDMA), and conventional single-user processing at the receivers. System capacity is formally defined as the maximum of the product of the number of users per cell times the user spectral efficiency for a given maximum outage probability. We adopt an information-theoretic definition of outage as the event that the mutual information of the block-interference channel resulting from a finite number of signal bursts spanned by the transmission of a user code word falls below the actual code rate, because of fading, shadowing, and interference. Starting from this definition, we develop a general framework which naturally takes into account many different aspects of F-TDMA cellular systems like channel reuse, channel utilization, waveform design, time-frequency hopping, voice activity exploitation, handoff, and power control strategies. Most importantly, our analysis does not rely on the choice of a particular coding scheme and can be applied to a very large class of systems in order to find guidelines for capacity-maximizing system design. A numerical example based on a typical urban mobile environment shows that there is a considerable capacity gap between actual F-TDMA systems and the limits predicted by our analysis, However, this gap can be filled by carefully designed "practical" systems, which make use of conventional single-user processing and simple coded modulation schemes.
引用
收藏
页码:1649 / 1661
页数:13
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