Channel quality indicator decoding for talk-around direct Communications based on IEEE 802.16.1a


Codeword decoding schemes are proposed for the channel quality indicator (CQI) of speak-around direct Communications based mostly on IEEE 802.16.1a that supports public protection and disaster relief operations. Since a CQI payload is encoded by using close to-orthogonal block encoding, a non-coherent correlation methodology is employed at the receiver to seek out the CQI index with maximum correlation. To enhance the decoding performance in high mobility environments, a differential decoding scheme is developed. By combining the correlation method and the differential decoder, a brand new hybrid decoding scheme is proposed. Since the proposed hybrid decoder uses the correlation approach in slow fading channels and exploits the differential decoding in fast fading channels, its decoding performance is strong to the speed of channel variation. Through theoretical analysis and numerical simulations in direction Communication environments, it's shown that the proposed non-coherent decoders are advantageous than a coherent decoding scheme, and therefore the performance of the proposed non-coherent decoders is compared for varying channel variation rate.

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