Abstract:
This invention provides a method for reducing transmission errors by a base station when transmitting a communication signal, comprising the steps of:
receiving an RF communication signal at said base station; analyzing said received signal for errors; generating a correction signal based upon said analysis; and correcting said communication signal using said correction signal prior to transmission of said communication signal from said base station.
Abstract:
A digital spread spectrum communication system calculates phase and frequency error (119) on a received signal from a communicating entity during a wireless communication and pre-corrects a signal for phase and frequency error prior to transmission to that entity. Moreover, a carrier offset correction (149) is performed, either at a chip, or at a symbol level.
Abstract:
A digital spread spectrum communication system calculates phase and frequency error (119) on a received signal from a communicating entity during a wireless communication and pre-corrects a signal for phase and frequency error prior to transmission to that entity. Moreover, a carrier offset correction (149) is performed, either at a chip, or at a symbol level.
Abstract:
A digital spread spectrum communication system calculates phase and frequency error (119) on a received signal from a communicating entity during a wireless communication and pre-corrects a signal for phase and frequency error prior to transmission to that entity. Moreover, a carrier offset correction (149) is performed, either at a chip, or at a symbol level.
Abstract:
A CDMA communication system includes a signal processor which encodes voice and nonvoice signals into data at various rates, e.g. data rates of 8 kbps, 16 kbps, 32 kbps, or 64 kbps as I and Q signals. The signal processor selects a specific data rate depending upon the type of signal, or in response to a set data rate. When the signal is received and demodulated, the baseband signal is at the chip level. Both the I and Q components of the signal are despread using the conjugate of the pn sequence used during spreading, returning the signal to the symbol level. Carrier offset correction is performed at the symbol level. A lower overall processing speed is therefore required.