Initialization sequence for bi-directional communications in a carrier-based system

A bit sequence, communication mode technology, applied in the field of communication systems, can solve problems such as robustness loss

Active Publication Date: 2014-06-04
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem with these types of initialization sequences is that the sequence is fixed

Method used

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  • Initialization sequence for bi-directional communications in a carrier-based system
  • Initialization sequence for bi-directional communications in a carrier-based system
  • Initialization sequence for bi-directional communications in a carrier-based system

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Embodiment Construction

[0024] Referring now to the drawings, for the sake of clarity, the depicted elements are not necessarily shown to scale, and in the several views, the same or similar elements are designated by the same reference numerals.

[0025] turn to figure 1 , an example of a communication system 10 can be seen. As shown, system 10 generally includes devices 12-1 and 12-2 capable of communicating with each other via communication links. Typically, the communication link is a wireless link employing millimeter waves (ie, wavelengths between approximately 0.1 mm and 10 mm). These devices 12-1 and 12-2 may include various devices (eg, circuit boards within a router) with functional circuitry 14-1 and 14-2 (eg, processors and memory). To communicate with each other, each device 12-1 and 12-2 may be equipped with a transceiver (i.e., transmitters 100-1 and 100-2 and receivers 200-1 and 200-2) acting as an IO system, allowing two-way communication . For one-way communication, one of the t...

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Abstract

The invention refers to an initialization sequence for bi-directional communications in a carrier-based system. A method is provided. An initial bit sequence is received by a receiver. A local oscillator is locked initially to a local reference and subsequently to the received signal using the initial bit sequence, and automatic gain control (AGC) is performed once the local oscillator is locked to the local reference. A Costas loop is then activated so as to achieve carrier frequency offset (CFO) lock, and sign inversion is detected. The receiver then synchronized with an end-of-training pattern.

Description

technical field [0001] The present invention relates generally to communication systems, and more particularly to amplitude and phase modulated communication systems. Background technique [0002] Communication between remote modems is common in many applications. However, depending on the type of system, there may or may not be an initialization sequence to be able to synchronize the remote modems. For example, start-up in electrical or optical serializer / deserializer (SerDes) systems is blind, meaning there is no initialization sequence. On the other hand, wireless systems (ie, cellular communication systems) have and generally require an initialization sequence, which occurs during a fixed training period. A problem with these types of initialization sequences is that the sequence is fixed and does not depend on the state of the remote receiver, leading to loss of robustness. Therefore, communication systems require an initialization sequence that depends on the state ...

Claims

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Application Information

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IPC IPC(8): H04L25/03
CPCH04L7/10H04L27/34
Inventor N·C·沃克B·A·克雷默R·F·佩恩
Owner TEXAS INSTR INC
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