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CDMA system which uses pre-rotation before transmission

A code division multiple access, user equipment technology, applied in the transmission system, phase modulation carrier system, digital transmission system and other directions, can solve the problems affecting the reverse link transmission process and so on

Inactive Publication Date: 2013-10-30
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar multipath distortion also affects the reverse link transmission process

Method used

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  • CDMA system which uses pre-rotation before transmission
  • CDMA system which uses pre-rotation before transmission
  • CDMA system which uses pre-rotation before transmission

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] The preferred embodiments of the present invention are described in detail below with reference to the drawings, and corresponding numerals represent corresponding components throughout.

[0021] Such as figure 2 As shown, the CDMA communication system 25 includes a transmitter 27 and a receiver 29, which can be set on a base station or a mobile user receiver. Transmitter 27 includes a signal processor 31 which encodes audio and non-audio signals into data at different rates, for example eight kilobytes per second, sixteen kilobytes per second, thirty-two kilobytes per second bytes or a data rate of sixty-four kilobytes per second. The signal processor 31 selects a specific data rate according to the type of signal or the set data rate.

[0022] In the background technology, generating a transmit signal in a multiple access system includes the following two steps. In a first step, the input data 33 is encoded by forward error correction (FEC) coding 35 . The input ...

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PUM

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Abstract

This Invention provides a method for reducing transmission errors by a user equipment (UE) when transmitting a communication signal, comprising the steps of: receiving an RF communication signal at said UE; analyzing said received signal for errors; generating a correction signal (119) based upon said analysis; and correcting said communication signal using said correction signal (119) prior to transmission of said communication signal from said UE.

Description

Background technique [0001] The present invention mainly relates to digital communication technology, in particular to a system and method for pre-rotating digital spread spectrum signals before transmission, thereby improving receiver accuracy and improving receiver phase and frequency information restoration. [0002] Many existing communication systems use digital spread spectrum modulation or Code Division Multiple Access (CDMA) techniques. Digital spread spectrum modulation is a communication technique in which the data to be transmitted is modulated with a pseudo-random noise signal and transmitted through a widened frequency band (spread spectrum). Data can be transmitted using code division multiple access technology without being affected by signal distortion or interfering frequencies in the transmission path. [0003] figure 1 is a simplified diagram of a code division multiple access communication system including a single communication channel with a given bandw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7097H04B1/62H04B1/7073H04L27/00
CPCH04B1/62H04B1/7097H04B2201/709709H04L2027/0022H04B1/7093H04B1/7115H04B1/69H04B1/711H04B2001/70724H04B2201/696H04L27/20
Inventor J·D·凯维尔
Owner INTERDIGITAL TECH CORP