Transmission Capacity of Wireless Ad Hoc Networks With Successive Interference Cancellation

• Published in: IEEE transactions on information theory 2007-08, Vol.53 (8), p.2799-2814
• Main Authors: Weber, S.P., Andrews, J.G., Xiangying Yang, de Veciana, G.
• Format: Article
• Language: English
• Subjects: Ad hoc networks; Applied sciences; Cancellation; Capacity planning; Computer networks; Data transmission; Degradation; Detection, estimation, filtering, equalization, prediction; Electric noise; Exact sciences and technology; Exact solutions; Information theory; Information, signal and communications theory; Interference; Interference cancellation; Mathematical analysis; Miscellaneous; Multiuser channels; Networks; Receivers; Receivers & amplifiers; Signal analysis; Signal and communications theory; Signal processing; Signal, noise; Silicon carbide; Spread spectrum communication; Spreads; successive interference cancellation; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); transmission capacity (TC); Upper bound; Wireless networks
• ISSN: 0018-9448; 1557-9654
• DOI: 10.1109/TIT.2007.901153

The transmission capacity (TC) of a wireless ad hoc network is defined as the maximum spatial intensity of successful transmissions such that the outage probability does not exceed some specified threshold. This work studies the improvement in TC obtainable with successive interference cancellation (SIC), an important receiver technique that has been shown to achieve the capacity of several classes of multiuser channels, but has not been carefully evaluated in the context of ad hoc wireless networks. This paper develops closed-form upper bounds and easily computable lower bounds for the TC of ad hoc networks with SIC receivers, for both perfect and imperfect SIC. The analysis applies to any multiuser receiver that cancels the K strongest interfering signals by a factor z isin [0, 1]. In addition to providing the first closed-form capacity results for SIC in ad hoc networks, design-relevant insights are made possible. In particular, it is shown that SIC should be used with direct sequence spread spectrum. Also, any imperfections in the interference cancellation rapidly degrade its usefulness. More encouragingly, only a few - often just one - interfering nodes need to be canceled in order to get the vast majority of the available performance gain.