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In 2004, Ministry of Internal Affairs and Communications (MIC) in Japan announced a new IT strategy called "u-Japan". This strategy is aiming to realize a ubiquitous network society by 2010. Based on the previous strategy called "e-Japan", started in 2001, broadband network has been popularized all over Japan. The object of next stage is to realize...
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Citations
... If the SDR terminal is realized, that terminal may connect to multiple wireless communication links. Depending on the channel condition, it may select one of the communication links in order to transmit data packets [2]. In this way, it may be possible to improve the frequency usage. ...
Software-defined radio (SDR) is a technology of widespread interest in wireless communications. With the SDR terminal, packets may be transmitted through multiple wireless communication links. The terminal may recognize the channel conditions and select one of the links. For this purpose, the channel estimation is required. In this paper, the channel estimation for IEEE802.11b WLAN system is investigated through an experiment. In order to estimate the impulse response of the channel, a pseudo-inverse matrix with a threshold is employed. The results indicate that the channel can be estimated precisely with an optimum threshold.
The advancement of cognitive radio and dynamic spectrum access systems technologies is being driven by multiple different stakeholders including technology enthusiasts, research programs, industry consortia and regulatory bodies worldwide. These stakeholders are driving early standards developments; however their often disparate visions are leading to a fractured standards landscape that may harm, versus help, mainstream adoption. Harmonizing these disparate visions requires a common “forum” responsible for advancing cognitive radio and dynamic spectrum access across markets. A case study from one such forum shows that these objectives can be achieved following such a model.
