Patent ID: 7876856
Filing Date: 2011-01-25
Classification: H03D,H04L

Abstract:
1. A low-IF quadrature receiver comprising: A. an antenna for receiving a radio frequency signal; B. a RF receiver having an input connected to the antenna and outputs carrying quadrature analog IF signals; C. an analog receiver having inputs connected to the outputs of the RF receiver and having outputs carrying quadrature digital IF band signals; D. digital filters having inputs connected to the outputs of the analog receiver and having outputs carrying in-phase and quadrature components of quadrature signals; E. a correction engine having inputs connected to the outputs of the digital filters, a complex-valued filter coefficient w input, and a v output; F. a coefficient controller having a complex-valued filter coefficient w output connected with the complex-valued filter coefficient w input, a complex-valued filter coefficient wA input, and a third coefficient output; G. an adaptation engine having inputs connected with the outputs of the digital filters, a complex-valued filter coefficient wA output connected with the complex-valued filter coefficient wA input, and a third coefficient input connected with the third coefficient output, the adaptation engine including a vA output; and H. a multiplexer having one input connected with the v output, another input connected with the vA output, and a v(n) output; and wherein the outputs of the digital filters include u outputs carrying in-phase u