SciELO - Scientific Electronic Library Online

vol.106 número3-4Khat (Catha edulis): the herb with officio-legal, socio-cultural and economic uncertaintyDetermining the relationship between invasive alien species density and a country's socio-economic status índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


South African Journal of Science

versão On-line ISSN 1996-7489
versão impressa ISSN 0038-2353


XU, Hongjun  e  PADAYACHEE, Laneil. Channel and delay estimation for base-station-based cooperative communications in frequency flat-fading channels. S. Afr. j. sci. [online]. 2010, vol.106, n.3-4, pp.1-6. ISSN 1996-7489.

Base-station-based cooperative communication is an asynchronous cooperative communication system. The challenge therein is to estimate the relative delay between the transmitters in the system. A channel and delay estimation algorithm based on the distributed Alamouti scheme has been previously discussed for the asynchronous cooperative system. The algorithm only makes accommodation for positive delay, that is, when data from Transmitter one always arrives at the receiver before data from Transmitter two. In reality, the data from Transmitter one does not always arrive at the receiver before data from Transmitter two in the asynchronous cooperative system, because of the constantly changing mobile environment in the system. This paper extends the algorithm to accommodate both positive and negative delays, which is when the data from Transmitter one arrives at the receiver before or after data from Transmitter two, in a Rayleigh block flat-fading channel. Simulation results show that the Cramér-Rao lower bound for channel and delay estimation is achieved for different delay values. The symbol error rate performance is also achievable compared to the channel and the delay is known at the receiver.

Palavras-chave : asynchronous cooperative communication; channel estimation; cyclic prefix; distributed space-time coding; pilot symbol design.

        · texto em Inglês     · Inglês ( pdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons