A study of robust decoding for BICM-OFDM systems impaired by unknown narrowband interference

• Main Authors: Chien-yi Lin, 林建毅
• Other Authors: Der-Feng Tseng
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/65453808329461762930

碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === For the wireless communication area, the cognitive radio systems which are using the Orthogonal Frequency Division Multiplexing technique are usually detriment arising from the interference of the other users who are sharing the same frequency bands. If the system not be adapted to match the environment in time, the system performance would be limited. To solve the problem, lots of complexity intensive estimation for the environment interference statistics is needed. However, it’s quite difficult to model the interference accurately. It’s because the interference is also not time-invariant. Then, we choose the impulse noise to simulate the time-invariant interference. In the thesis, we propose a decoding scheme which focuses on efficiently and robustly to defense the impulse noise with the concept of clipping that is related to the bit metric erasure marking, channel coding and iteration manner. We also derive the simulation results in several cases. When we set the clipping threshold of bit metric appropriately, the system bit error probability performance would be 〖10〗^(-5) without the help of interference statistics.