Patent ID: 6597748
Filing Date: 2003-07-22
Classification: H04B

Abstract:
Apparatus for receiving a signal that is in conformity with a communications standard and comprises a carrier signal modulated by a wanted signal, said communications standard defining a plurality of communications channels having central frequencies that are separated from one another by a fixed frequency referred to as a channel spacing, the modulated carrier signal occupying one of said plurality of communications channels, the apparatus including a local oscillator for generating first and second signals at an actual local oscillator frequency which differs from said central frequency of the channel occupied by said wanted signal by a frequency difference whose magnitude is greater than half the channel spacing whereby when the received carrier signal is mixed with the first and second signals, a complex, digital Very Low Intermediate Frequency (VLIF) signal, modulated by the wanted signal, is centered about a very low intermediate frequency whose magnitude is larger than half the channel spacing.