Pre-phase error correction
AssigneeInterDigital Technology Corporation
InventorJohn D. Kaewell
Life of this patent
Estimating the term…
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.
Claims17
An integrated circuit (IC), comprising:
- circuitry configured to receive a radio frequency signal;
- wherein the circuitry is further configured to despread a plurality of data signals and to despread a pilot signal from the radio frequency signal;
- wherein a phase of each of the data signals was adjusted prior to transmission;
- and
- circuitry configured to derive a correction signal, the correction signal including weights to adjust the phase of the data signals, and to output the correction signal for sending to a base station so that the phase of the data signals are adjusted in response to the correction signal.
An integrated circuit (IC), comprising:
- circuitry configured to adjust a phase of a plurality of spread data signals in response to a correction signal, the correction signal including weights to adjust the phase of the data signals;
- wherein the correction signal was received from a mobile device;
- wherein the circuitry is further configured to output for transmission the plurality of phase adjusted data signals to the mobile station and to output for transmission a spread pilot signal.
A wireless communication system including at least one mobile user device and at least one base station, comprising:
- the mobile user device comprising:
- a receiver configured to receive a radio frequency signal;
- wherein the receiver is further configured to despread a plurality of data signals and to despread a pilot signal from the radio frequency signal;
- wherein a phase of each of the data signals was adjusted prior to transmission;
- and
- wherein the mobile user device is configured to derive a correction signal, the correction signal including weights to adjust the phase of the data signals, and to send the correction signal to the base station so that the phase of the data signals are adjusted in response to the correction signal;
- and
- the base station comprising:
- a transmitter to adjust a phase of a plurality of spread data signals in response to the correction signal, the correction signal including the weights to adjust the phase of the data signals;
- wherein the correction signal was received from the mobile device;
- wherein the transmitter is further configured to transmit the plurality of phase adjusted data signals to the mobile station and to transmit a spread pilot signal.
Dependencies are inferred from the claim text.