Mapping a transmission stream in a virtual baseband to a physical baseband with equalization

摘要

Embodiments include processes, systems, and devices for reshaping virtual baseband signals for transmission on non-contiguous and variable portions of a physical baseband, such as a white space frequency band. In the transmission path, a spectrum virtualization layer maps a plurality of transmission components associated with a transmission symbol produced by a physical layer protocol to sub-carriers of the allocated physical frequency band. The spectrum virtualization layer then outputs a physical transmission symbol composed of time-domain samples derived from the mapped frequency components and a cyclic prefix. In the receive path, a time-domain symbol received on the physical baseband is reshaped and equalized by the virtual spectrum layer in order to recompose a time-domain samples of a transmission stream in the virtual baseband.

主权项

1. A method, comprising:
mapping, by a spectrum virtualization module of a wireless device, a plurality of transmission components associated with a transmission stream produced by a wireless physical layer protocol module of the wireless device for transmission in a virtual frequency band to sub-carriers associated with one or more allocated physical frequency bands, wherein:
the plurality of transmission components associated with the transmission stream includes M frequency components, wherein M is an integer that is not less than one;the virtual frequency band has a virtual bandwidth; andthe one or more allocated physical frequency bands are part of a physical baseband; performing an M-point fast Fourier transform on a plurality of time-domain samples of the transmission stream to derive the M frequency components; performing an N-point inverse fast Fourier transform on the mapped plurality of the M frequency components to derive a plurality of physical time-domain transmission samples, wherein N is an integer that is not less than one and, wherein N is at least as large as M multiplied by a ratio that is a function of the virtual bandwidth and a span of the physical baseband; appending, by the spectrum virtualization module, a cyclic prefix to a plurality of physical time-domain transmission samples derived by transformation of the plurality of the mapped transmission components associated with the transmission stream to generate a physical transmission symbol for transmission on the one or more allocated physical frequency bands; and outputting the physical transmission symbol by the spectrum virtualization module.