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Baseband data transmission method and system

A data transmission system and baseband data technology, applied in the field of communication, can solve the problems of small bandwidth and large delay

Pending Publication Date: 2022-07-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing NRZ modulation technology has low delay but small bandwidth, while PAM4 modulation technology has large bandwidth but large delay

Method used

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  • Baseband data transmission method and system
  • Baseband data transmission method and system

Examples

Experimental program
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Effect test

Embodiment Construction

[0054] like figure 1 As shown, it is a schematic diagram of a signal of non-return-to-zero (NRZ) modulation in the prior art. NRZ modulation is sent in symbols, each symbol has only 1 bit, where bit=1 and bit=0 respectively use different levels, such as bit=1, send 100mV, bit=0, send -100mV . The voltage interval between the two signal levels is large, and the bit error rate is low. Generally, there is no need to add error correction coding to NRZ modulation. Therefore, the delay of NRZ modulation is low, but the bandwidth of NRZ modulation is small.

[0055] like figure 2 As shown, it is a schematic diagram of a signal modulated by four-level pulse amplitude modulation (4Pulse Amplitude Modulation, PAM4) in the prior art. PAM4 modulation is sent by symbol, and each symbol has 2 bits, where bit=00, 01, 10, 11. PAM4 uses 4 levels (0, 1, 2, 3) respectively, corresponding to 4 different voltages. For example, for bit=11, send 100mV; bit=10, send 33mV; bit=01, send -33mV; bi...

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PUM

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Abstract

The invention discloses a baseband data transmission method and system, the system has a first sending channel and a second sending channel with different performance indexes, a first switching unit selects the output of one sending channel according to the type of a data packet to be transmitted and sends the output to a transmitter, so that when a plurality of different types of data to be transmitted exist, the output of the first sending channel is sent to the transmitter. According to the invention, the output can be selected from the appropriate transmission path through the first switching unit without restarting or link re-negotiation of the data transmission system, so that the hybrid transmission of various types of data packets in the system is realized.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular, to a method and system for baseband data transmission. Background technique [0002] There are a large number of high-speed interconnection interfaces in modern computers and wired communication systems. Different from wireless communication systems, high-speed interconnection interfaces use baseband transmission, that is, the transmission data is not modulated by carrier waves. Due to the existence of various noises in the transmitter, receiver, and channel of the data, the transmission signal will be distorted, and then bit errors will be brought to the receiver side. The higher the frequency, the worse the signal-to-noise ratio and the higher the bit error rate, thus limiting the transmission bandwidth of the signal to not be too high. With the development of technology, the bandwidth requirements for high-speed interconnection interfaces are indeed highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L45/30H04L27/00
CPCH04L45/30H04L27/0008H04L45/121H04L45/22H04L45/123H04L45/124H04L45/125H04L25/4917H04L25/4904H04L1/0033H04L1/0003H04L1/0018H04L1/0025H04B1/0483H04L25/0268
Inventor 吴枫
Owner HUAWEI TECH CO LTD
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