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Optimized data allocation & combining scheme for ICI self cancellation in OFDM systems

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3 Author(s)
Goel, A. ; ECE Dept., Jaypee Inst. of Inf. Technol., Noida, India ; Nagpal, A. ; Kaur, J.

Symmetric symbol repeat (SSR) intercarrier interference (ICI) self cancellation scheme has proved to be a simple and convenient technique to reduce ICI caused by frequency offsets. It utilizes data allocation and combining of (1,-1) on two symmetrically placed subcarriers to mitigate the effect of ICI. However, the data allocation factors (1,-1) are not an optimum. In this paper, an optimum data allocation (1,-λ) and combining (1,-μ) scheme is proposed to maximize CIR performance for an estimated normalized frequency offset ε. But, this requires continuous CFO estimation and feedback circuitry. A sub-optimal scheme utilizing sub-optimal pair (λsoso) is also proposed to completely eliminate the requirement of CFO estimation. Simulation results confirm the outperformance of the proposed optimal scheme over conventional SSR ICI self cancellation scheme. Sub-optimal scheme can be applied for the any range of ε and a sub optimum value can be (λsoso) calculated using proposed sub-optimal scheme. The CIR of SSR ICI self cancellation scheme using the proposed sub-optimal approach is also found to be better than conventional SSR ICI self cancellation.

Published in:

Wireless and Optical Communications Networks (WOCN), 2012 Ninth International Conference on

Date of Conference:

20-22 Sept. 2012