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Interface method between control layer and physical layer of orthogonal frequency-division multiplexing communication system

A physical layer interface and multiplexing communication technology, applied in the field of digital communication, can solve the problems of slow reading, unupdated reading, data loss, etc.

Inactive Publication Date: 2005-08-24
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the data transmission rate of the media access control layer is too large or too small, there is no way to work normally with this traditional caching mechanism, because the cache space is limited, if the media access control layer writes data to the cache If the speed of the media access control layer is too fast, the effective data that has not been read will be overwritten, resulting in data loss; Read data that has not been updated, the data is invalid

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  • Interface method between control layer and physical layer of orthogonal frequency-division multiplexing communication system
  • Interface method between control layer and physical layer of orthogonal frequency-division multiplexing communication system
  • Interface method between control layer and physical layer of orthogonal frequency-division multiplexing communication system

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Embodiment Construction

[0029] The technical solution of the present invention will be further described below through specific examples.

[0030] An embodiment is a wireless LAN IEEE802.11a system to which the present invention is applied. The capacity of dual-port RAM used in this example is 16K. In this example, the write address is at least 1K units ahead of the read address, that is, A=1K, and the write address is at most B units ahead of the read address, that is, B=1K. The concrete steps that the present invention is applied to IEEE802.11a system are:

[0031] 1. Generate the chip select signal for write operation and the address of the cache

[0032] Decode the signal given by the media access control layer to obtain the buffered chip select signal. If the chip selection selects the dual-port random access memory, the enabling terminal of the random access memory write address generator is set to a high level, and it adds one count to generate a new random access memory write address. If ...

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Abstract

A method for realizing interfaces of control layer and physical layer of orthogonal FDM communication system is to apply a register and two-port random memory as a data buffer unit, a write control unit selects and generates write address to finish writing the data in a buffer memory, a data sequencing unit operates on necessary sequence and package to the data in the buffer memory, the read control unit selects to generate read address to read out the data to read and wirte at the same time to coordinate rate by a rate limitation unit to reduce the write rate by signal line if it's too fast or to send and interrupt signal to the control layer, if it's too slow and a control feedback unit controls and feeds back the status.

Description

Technical field: [0001] The invention relates to a method for realizing the interface between the media access control layer (MAC layer) and the physical layer (PHY layer) of an orthogonal frequency division multiplexing communication system, which is a data framing realization method based on the IEEE802. The field of digital communication technology. Background technique: [0002] The IEEE802.11a standard was proposed in 1999, and it is an extension of the 802.11 standard. Since its encoding and mapping method can reach up to 64QAM, and its modulation method is Orthogonal Frequency Division Multiplexing (OFDM), it can provide a rate of up to 54Mbps. At the same time, it works in the 5GHz frequency band, which avoids some inevitable conflicts in the unregulated frequency band of 2.4GHz. So it is a very promising WLAN standard. [0003] But in the system based on 802.11a, the data transmission rate is very high, and there are many difficulties in hardware implementation. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04L27/32H04L29/02
Inventor 唐博周跃峰胡亮亮张海滨罗汉文宋文涛
Owner SHANGHAI JIAOTONG UNIV