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access icon free An efficient multiple access interference suppression scheme in asynchronous femtocells

© The Institution of Engineering and Technology
Received 22/12/2012, Accepted 03/06/2013, Revised 09/05/2013, Published

This work considers a code division multiple access (CDMA)-based femtocell system where a fixed set of subscribed users communicate simultaneously to a femtocell access point (FAP) in an asynchronous fashion during the uplink. The main goal of this paper is to present an augmentation protocol for the physical layer of the CDMA2000 femtocell standard with focus on the multiple access interference (MAI) suppression. The above-closed access femtocell uses a unique set of cyclic orthogonal binary codes to eliminate the MAI caused by packet collisions. This property ensures that the time and data rate asynchronicity of active nodes in a femtocell produces a zero MAI situation at the FAP. The work investigates the optimality and the effectiveness of such codes in femtocells from the link bit error rate performance in a practical Rayleigh-fading environment, where Kalman filtering is used at the FAP for the channel estimation. Theoretical findings are verified by simulation evaluations and it is shown numerically a significant improvement in the performance of the proposed scheme when compared with conventional non-cyclic orthogonal codes in a Rayleigh-fading channel in the asynchronous femtocell.

Inspec keywords: cyclic codes; error statistics; telecommunication congestion control; Rayleigh channels; interference suppression; channel estimation; radio links; code division multiple access; binary codes; femtocellular radio; Kalman filters; protocols; orthogonal codes; radiofrequency interference

Other keywords: active node; FAP; augmentation protocol; multiple access interference suppression; time; asynchronous femtocell; channel estimation; CDMA2000 femtocell standard; link bit error rate performance; femtocell access point; Kalman filtering; data rate; cyclic orthogonal binary code; CDMA-based femtocell system; closed access femtocell; MAI suppression; uplink; Rayleigh-fading channel; code division multiple access; subscribed user; packet collision

Subjects: Other topics in statistics; Protocols; Multiple access communication; Codes; Mobile radio systems; Electromagnetic compatibility and interference; Filtering methods in signal processing; Communication channel equalisation and identification

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