Apparatus for transmitting multiple CDMA channels

A channel and frequency channel technology, applied in signal channels, multi-frequency code systems, electrical components, etc., can solve the problems of transmitter design complexity and cost increase
CN101490996AInactive Publication Date: 2009-07-22QUALCOMM INC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
QUALCOMM INC
Publication Date
2009-07-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A multi-carrier transmitter capable of transmitting on one or multiple frequency channels simultaneously is described. In one design, the multi-carrier transmitter includes at least one processor and a single radio frequency (RF) transmission chain. The processor(s) may generate output chips for each of multiple frequency channels, digitally filter and upsample the output chips for each frequency channel to obtain filtered samples, and digitally upconvert the filtered samples for each frequency channel to a different frequency to obtain upconverted samples. The processor(s) may then combine the upconverted samples for the multiple frequency channels to obtain composite samples, perform pre-distortion on the composite samples for I / Q mismatch compensation, and upsample the pre-distorted samples to obtain output samples. The output samples may be converted to an analog signal with a wideband DAC. The RF transmit chain may process the analog signal to generate an RF output signal.
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Description

[0001] related application

[0002] This patent application claims priority to Provisional Application No. 60 / 831,044, filed July 14, 2006, entitled "MODULATION OFMULTIPLE DATA CHANNELS WITH A SINGLE RF TRANSMIT CHAIN," which is assigned to the assignee of this application , which is expressly incorporated herein by reference. technical field

[0003] The present disclosure relates generally to communications, and more particularly to transmitters in wireless communication systems. Background technique

[0004] Wireless communication systems are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting multiple users by sharing available system resources. Examples of these multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA ) sys...

Claims

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