BibTeX:

@article{IJIRSTV3I10091,
     title={Spreading Sequence Design for Multirelay Networks},
     author={Sruthi Maria Abraham, Naveena Mariam Jose and Hari S},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={3},
     number={10},
     pages={276--281},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV3I10091.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

Multipath fading degrades the performance of wireless communication system significantly as data rate increases. In-order to combat with multipath fading, orthogonal frequency division multiplexing (OFDM) have been used in existing systems. Another effective method is a code division multiple access (CDMA) scheme. It has used extensively for relay network communication systems. In this paper consists of uplink CDMA relay networks and downlink CDMA relay networks. The uplink CDMA relay networks consist of multiple sources, multiple relays and a single destination. In downlink CDMA relay networks consist of a single source, multiple relays and multiple destinations. The objective of the paper is to propose a unique, simple method of finding optimum non-binary pseudo noise (PN) spreading and de-spreading sequences. This employs maximum signal to interference plus noise ratio (SINR) criterion and channel state information (CSI). The use of SIC helps to reduce multi-user interference caused. Effective encoding and decoding scheme is used compared to existing works. Also examines the sensitivity of the schemes to 1-bit quantization, wideband jamming, mistiming alignment. Simulation results shows that the proposed method converges much faster in finding optimum PN sequences compared to existing systems.

Code-Division Multiple Access (CDMA), Fully Connected (FC), Partially Connected, Relay Network, Signal-To-Interference-Plus-Noise Ratio (SINR), CRAN, Spreading Sequence, Successive Interference Canceller (SIC), Turbo Encoder and Decoder, LMS Filter