Spectral efficiency improvement for the under-11GHz Broadband Wireless Access

Our evaluation is performed in the context of a study of adaptive radio techniques, in the attempt to improve link availability and transmission quality of BWA (broadband wireless access) systems, and to achieve an efficient use of radio resources. As part of an evaluation of coexistence issues in the under-11 GHz bands, we have analysed several adaptive techniques currently in use in IEEE 802.16 and IEEE 802.11 (a, b, g) standards. This paper is focused on the spectral efficiency and BER performance of the 802.16 FEC block. One of our goals was to study the effect of the interleaving process on the spectrum efficiency for different environments modelled by different radio channels. Another goal was to measure the system throughput and the delay introduced by the interleaver in the presence of noise, these enabling us to investigate from which BER and/or SNR threshold the interleaver can increase the overall spectrum efficiency. In the end, we identify six evaluation criteria for an adaptive FEC (forward error correction) scheme that can improve the performance, in terms of throughput, in an 802.16 SC system. The detailed observations will enable us to set the premour evaluation is performed in the context of a study of adaptive radio techniques, in the attempt to improve link availability and transmission quality of BWA (broadband wireless access) systems, and to achieve an efficient use of radio resources. As part of an evaluation of coexistence issues in the under-11 GHz bands, we have analysed several adaptive techniques currently in use in IEEE 802.16 and IEEE 802.11 (a, b, g) standards. This paper is focused on the spectral efficiency and BER performance of the 802.16 FEC block. One of our goals was to study the effect of the interleaving process on the spectrum efficiency for different environments modelled by different radio channels. Another goal was to measure the system throughput and the delay introduced by the interleaver in the presence of noise, these enabling us to investigate from which BER and/or SNR threshold the interleaver can increase the overall spectrum efficiency. In the end, we identify six evaluation criteria for an adaptive FEC (Forward Error Correction) scheme that can improve the performance, in terms of throughput, in an 802.16 SC system. The detailed observations will enable us to set the premises for new adaptive strategies at the PHY and MAC layer is set for new aadaptivedaptive strategies at the PHY and MAC layer.