Article Dans Une Revue IETE Technical Review Année : 2025

A Low-Complexity Modified Pilot-Based Channel Estimation Method for IEEE 802.22 Systems with Performance–Efficiency Trade-off

Résumé

Wide-area cognitive orthogonal frequency-division multiplexing (OFDM) links in television white space (TVWS) under the IEEE 802.22 Wireless Regional Area Network (WRAN) standard require channel estimation (CE) that is both accurate and computationally frugal under mobility. We propose a low-complexity Modified Pilot-Based Channel Estimation (MPCE) scheme that operates in the channel impulse response (CIR) domain: interpolation weights are computed once per frame and reused across OFDM symbols, eliminating redundant per-symbol estimation while preserving fidelity. Complementing this, we cast pilot placement as an information-theoretic D-optimal design-maximize log det of the Fisher information matrix (FIM)-and solve it with a greedy exchange using rank-one (Sherman-Morrison) updates under IEEE 802.22 feasibility (guard/direct-current (DC) tone exclusion and minimum spacing). A FIM/Cramér-Rao bound (CRB) analysis links pilot spacing and correlation to mean-squared error (MSE), explaining when nonuniform pilots help. Simulations under wide-sense stationary uncorrelated scattering (WSSUS) Rayleigh fading show that MPCE reduces runtime by up to 78% versus conventional pilot interpolation while achieving comparable or lower MSE and post-detection bit-error rate (BER) for quadrature phase-shift keying (QPSK) and 16-ary quadrature amplitude modulation (16QAM), with the largest gains in the signal-to-noise ratio (SNR) range of 10-20 dB. The D-optimal solver converges to a near-uniform layout in our regime (justifying the standard pattern) and departs from uniformity when pilots are scarce or frequency selectivity increases. MPCE thus offers a scalable, hardware-friendly CE approach for wide-area cognitive OFDM links.

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Dates et versions

hal-05449039 , version 1 (08-01-2026)

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Kaushik Das, D. Sagar Babu, Chetna Singhal, Amit Kumar Dutta, Raja Datta. A Low-Complexity Modified Pilot-Based Channel Estimation Method for IEEE 802.22 Systems with Performance–Efficiency Trade-off. IETE Technical Review, 2025, 42 (6), pp.740-762. ⟨10.1080/02564602.2025.2563613⟩. ⟨hal-05449039⟩
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