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Receiver-transmitter unit according to load wave offset pre-tuning

A transceiver and carrier offset technology, applied in carrier adjustment, modulated carrier system, telephone communication, etc., can solve the problems of expensive, complex storage and tracking, delay, etc.

Inactive Publication Date: 2004-06-23
THOMSON CONSUMER ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This storage and tracking can be complex, expensive, cause latency, or otherwise be unnecessary, but without it acquisition latency increases

Method used

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  • Receiver-transmitter unit according to load wave offset pre-tuning
  • Receiver-transmitter unit according to load wave offset pre-tuning
  • Receiver-transmitter unit according to load wave offset pre-tuning

Examples

Experimental program
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Embodiment Construction

[0019] In the present invention, the transceiver transmitter of each handset of a multi-line radiotelephone system includes a prerotator that prerotates Signal sent to the base unit of the system. This ensures that the signal received by the base unit's receiver from each handset is received virtually without carrier offset (or rotation) during the corresponding time slot, e. and the need to track the carrier offset of each individual handset. These and other details and advantages of the invention are described in more detail below.

[0020] see below figure 1 , which shows a block diagram of a TDMA multi-route wireless telephone system 100 according to an embodiment of the present invention. TDMA system 100 includes a base unit 110 having receiver and transmitter units 112 and 111 and coupled via telephone line 115 to an external telephone network 116 . System 100 also includes N wireless handsets 120 1 , 120 2 ,...120 N . Each handset has a transmitter and receiver un...

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PUM

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Abstract

A wireless telephone system having a plurality of wireless handsets and a base unit, the base unit having a base transceiver. Each handset has a handset transceiver for establishing a wireless link over a shared channel with the base unit via the base transceiver, wherein the base transceiver transmits to a given handset transceiver a forward signal at a carrier frequency. Each handset transceiver has a receiver having a carrier tracking loop for detecting and removing a carrier offset from the forward signal; a transmitter for transmitting to the base transceiver a return signal; and an oscillator, independent of a base oscillator of the base transceiver on which the carrier frequency is based, for driving the receiver and transmitter of the handset. The handset transmitter comprises a prerotator that prerotates the return signal in accordance with the carrier offset detected by the carrier tracking loop so that the return signal will be received by the base transceiver with substantially no carrier offset.

Description

technical field [0001] The present invention relates to a digital signal processing system, and more particularly to communication between transceivers with independent oscillators. Background technique [0002] The transmission of digital data from a transmitter to a receiver requires various digital signal processing techniques to enable the transmitter to transmit data and successfully recover the data by the receiver. In a digital radiotelephone system, the radiotelephone handset unit communicates via digital radio signals with a base unit, which is usually connected to an external telephone network via a standard telephone line. In this manner, a user can use a wireless handset to communicate with other users through the base unit and the telephone network. [0003] Multi-line wireless telephone systems are used in various situations, such as businesses with many telephone users. Such systems employ a handset that communicates with up to N handsets simultaneously, usu...

Claims

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Application Information

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IPC IPC(8): H04B1/38H04J11/00H04L27/00H04M1/725
CPCH04L2027/0022H04L27/0014H04B1/7085
Inventor 保罗·G·克努森库玛·拉梅斯瓦米许东昌
Owner THOMSON CONSUMER ELECTRONICS INC
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