Electronic and Radio Engineering by F.E. Terman

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By F.E. Terman

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The data in each parallel channel are passed through a pulse shaping filter g(t) and then applied to a modulator, with nB subcarriers f0 , f1 , . . , fnB −1 . The separation between two adjacent frequencies is carefully chosen such that subcarriers are pairwise orthogonal. If Δf is the difference between adjacent subcarriers, the overall bandwidth W is nB Δf . The nB modulated subcarriers are combined to give an OFDM symbol x(t). In the conventional single carrier modulation approach, the modulated signal occupies the entire bandwidth W centered around the carrier frequency.

This leads to efficient use of resources in the devices. The user does not have to manage the individual networks and devices and the central controller can be used to automate the management of the home network. Such central control also enhances the security in such networks where the controller can be used as a gateway to the external world. The cognitive digital home applications fit into the underlay framework of cognitive radio operation because of the low-power operation of the cognitive radio devices.

After initialization, nodes execute a discovery protocol based on periodic reporting of local link states of neighboring nodes using a controlled one-hop broadcast mechanism. The discovery protocol also interacts with a cross-layer routing module that provides end-to-end reachability and path information across multiple hops, which are dynamically configured with cross-layer parameters including frequency, power, rate, etc. The fourth key component is the support for distributed naming and addressing by which network nodes map their permanent names to dynamically assigned network addresses which may change with network structure and mobility.

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