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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

Inactive Publication Date: 2009-07-22
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to support transmission over multiple frequency channels, the design complexity and cost of the transmitter can increase significantly

Method used

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  • Apparatus for transmitting multiple CDMA channels
  • Apparatus for transmitting multiple CDMA channels
  • Apparatus for transmitting multiple CDMA channels

Examples

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Embodiment Construction

[0021] The multicarrier transmitters described herein can be used in various wireless communication systems, such as Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access ( OFDMA) systems and Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, the terms "system" and "network" are often used interchangeably. A CDMA system may implement a radio technology such as cdma2000, which covers IS-2000, IS-95, and IS-856 standards, Universal Terrestrial Radio Access (UTRA), and others. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). A TDMA system can implement a radio technology such as Global System for Mobile Communications (GSM). The OFDMA system can implement such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE 802.20, Flash-OFDM And so on wireless technology. These various wireless technologies and standards...

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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.

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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Application Information

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IPC IPC(8): H04L5/06H04B1/707H04L27/26
Inventor R·R·里克K·唐
Owner QUALCOMM INC
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