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Iterative turbo beamforming for orthogonal frequency division multiplexing-based hybrid terrestrial-satellite mobile system

Iterative turbo beamforming for orthogonal frequency division multiplexing-based hybrid terrestrial-satellite mobile system

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In the context of orthogonal frequency division multiplexing (OFDM)-based systems, pilot-based beamforming (BF) exhibits a high degree of sensitivity to the pilot sub-carriers. Increasing the number of reference pilots significantly improves BF performance as well as system performance. However, this increase comes at the cost of data throughput, which inevitably shrinks due to transmission of additional pilots. Hence an approach where reference signals available to the BF process can be increased without transmitting additional pilots can exhibit superior system performance without compromising throughput. Thus, the authors present a novel three-stage iterative turbo beamforming (ITBF) algorithm for an OFDM-based hybrid terrestrial-satellite mobile system, which utilises both pilots and data to perform interference mitigation. Data sub-carriers are utilised as virtual reference signals in the BF process. Results show that when compared to non-iterative conventional BF, the proposed ITBF exhibits bit error rate gain of up to 2.5 dB with only one iteration.

Inspec keywords: iterative methods; array signal processing; error statistics; mobile radio; OFDM modulation; satellite communication

Other keywords: hybrid terrestrial-satellite mobile system; noniterative conventional BF; pilot-based beamforming; pilot-based BF; orthogonal frequency division multiplexing; OFDM; data subcarrier; virtual reference signal; pilot subcarrier; data throughput cost; interference mitigation; ITBF algorithm; iterative turbo beamforming algorithm

Subjects: Modulation and coding methods; Other topics in statistics; Signal processing and detection; Interpolation and function approximation (numerical analysis); Mobile radio systems; Satellite communication systems

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