ISCC '00 Proceedings of the Fifth IEEE Symposium on Computers and Communications (ISCC 2000)
EURASIP Journal on Wireless Communications and Networking
Random matrix theory and wireless communications
Communications and Information Theory
Using cross-system diversity in heterogeneous networks: Throughput optimization
Performance Evaluation
Optimality of beamforming in fading MIMO multiple access channels
IEEE Transactions on Communications
Asymptotic analysis of outage region in CDMA MIMO systems
IEEE Transactions on Information Theory
Asynchronous CDMA systems with random spreading-part I: fundamental limits
IEEE Transactions on Information Theory
Spectral-efficiency of multi-antenna links in ad-hoc wireless networks with limited Tx CSI
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Multi-cell MIMO cooperative networks: a new look at interference
IEEE Journal on Selected Areas in Communications - Special issue on cooperative communications in MIMO cellular networks
IEEE Journal on Selected Areas in Communications - Special issue on cooperative communications in MIMO cellular networks
Hi-index | 754.96 |
Much of the performance analysis on multiuser receivers for direct-sequence code-division multiple-access (CDMA) systems is focused on worst case near-far scenarios. The user capacity of power-controlled networks with multiuser receivers are less well-understood. Tse and Hanly (see ibid., vol.45, p.541-657, 1999) have shown that under some conditions, the user capacity of an uplink power-controlled CDMA cell for several important linear receivers can be very simply characterized via a notion of effective bandwidth. We show that these results extend to the case of antenna arrays. We consider a CDMA system consisting of users transmitting to an antenna array with a multiuser receiver, and obtain the limiting signal-to-interference (SIR) performance in a large system using random spreading sequences. Using this result, we show that the SIR requirements of all the users can be met if and only if the sum of the effective bandwidths of the users is less than the total number of degrees of freedom in the system. The effective bandwidth of a user depends only on its own requirement. Our results show that the total number of degrees of freedom of the whole system is the product of the spreading gain and the number of antennas. In the case when the fading distributions to the antennas are identical, we show that a curious phenomenon of “resource pooling” arises: the multiantenna system behaves like a system with only one antenna but with the processing gain the product of the processing gain of the original system and the number of antennas, and the received power of each user the sum of the received powers at the individual antennas