This paper proposes a joint network-channel codingbased on turbo codes for user cooperation. The scenario under consideration is one in which two ＂partners＂--UE1 and UE2---cooperate in transmitting information to th...This paper proposes a joint network-channel codingbased on turbo codes for user cooperation. The scenario under consideration is one in which two ＂partners＂--UE1 and UE2---cooperate in transmitting information to the base station （BS）. Each partner transmits both locally generated information and the relayed information that originated at the other partner. The local information and relayed information are jointly network-channel coded to form a superimposed codeword, and the adjacent codewords transmitted in turn by the two partners are tightly correlative like a chain. It is shown via simulation that the proposed scheme achieves full diversity gain compared with the other user cooperation schemes, including those based on coded cooperation and distributed space-time coded cooperation.展开更多
Considering that the white LED＇s spectral response decreases exponentially with the increase of carrier frequency for the on-off-keying non-return-to-zero （OOK-NRZ） visible light communication （VLC） data links, a...Considering that the white LED＇s spectral response decreases exponentially with the increase of carrier frequency for the on-off-keying non-return-to-zero （OOK-NRZ） visible light communication （VLC） data links, a fast-order RC high-pass filter isdesigned and fabricated as a post-equalizer （PE） to compensate the LED spectral response. Formulation and simu- lation are both available for illustrating the VLC performance with and without PE. Experiments are performed in detail for the fabricated OOK-NRZ VLC system integrated with PE. The data transmission results show that by using PE, the mea- sured carrier bandwidth is enhanced from 0.8 （0.4-1.2） MHz to 1.7 （0-1.7） MHz, and the bit-error-rate （BER） is less than 10^-9. It proves the feasibility of the proposed scheme in OOK-NRZ VLC data links.展开更多
文摘This paper proposes a joint network-channel codingbased on turbo codes for user cooperation. The scenario under consideration is one in which two ＂partners＂--UE1 and UE2---cooperate in transmitting information to the base station （BS）. Each partner transmits both locally generated information and the relayed information that originated at the other partner. The local information and relayed information are jointly network-channel coded to form a superimposed codeword, and the adjacent codewords transmitted in turn by the two partners are tightly correlative like a chain. It is shown via simulation that the proposed scheme achieves full diversity gain compared with the other user cooperation schemes, including those based on coded cooperation and distributed space-time coded cooperation.
基金supported by the Innovation Fund for Technology Based Firms of Changchun (No. 10ZC04)the Undergraduate Innovative Experiment Program of Jilin University (No. 2011C51174)
文摘Considering that the white LED＇s spectral response decreases exponentially with the increase of carrier frequency for the on-off-keying non-return-to-zero （OOK-NRZ） visible light communication （VLC） data links, a fast-order RC high-pass filter isdesigned and fabricated as a post-equalizer （PE） to compensate the LED spectral response. Formulation and simu- lation are both available for illustrating the VLC performance with and without PE. Experiments are performed in detail for the fabricated OOK-NRZ VLC system integrated with PE. The data transmission results show that by using PE, the mea- sured carrier bandwidth is enhanced from 0.8 （0.4-1.2） MHz to 1.7 （0-1.7） MHz, and the bit-error-rate （BER） is less than 10^-9. It proves the feasibility of the proposed scheme in OOK-NRZ VLC data links.
