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Data transmission equipment and method of OFDM communication system

A multiplexing communication and orthogonal frequency division technology, applied in the field of mobile communication systems, can solve problems such as multiple access interference, increase the complexity of system equipment and system delay, and achieve the effect of zero user interference

Inactive Publication Date: 2004-07-07
武汉汉网高技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the pseudo-random PN scrambling code in the prior art is not absolutely orthogonal, so multiple access interference will be introduced to increase the complexity of the system equipment and the system delay, and provide a zero-user interference Data transmission equipment and method thereof in orthogonal frequency division multiplexing OFDM communication system

Method used

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  • Data transmission equipment and method of OFDM communication system
  • Data transmission equipment and method of OFDM communication system
  • Data transmission equipment and method of OFDM communication system

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Embodiment Construction

[0018] Such as figure 1 As shown, a base station 101 and several mobile stations 102-105, the base station and the mobile station communicate through microwave, including the downlink from the base station to the mobile station and the uplink from the mobile station to the base station.

[0019] Such as figure 2 , the user information source 201 generates information bits, and the information bits are encoded and modulated by the channel coding modulator 202 to obtain modulated signals; the modulated signals are distributed to N orthogonal subcarriers allocated to users to obtain N-dimensional vector signal symbols, and then Through the IFFT&CPI module 203, the time-domain vector signal symbols with cyclic prefixes are added; the work completed by the symbol-level Walsh spreader 204 is to perform symbol-level Walsh spread spectrum on the vector signal symbols output from the IFFT&CPI module 203. frequency operation attached image 3 Description, detailed below; the transmit...

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Abstract

This invention is related to data transmission device in multi-users interference OFMA communication system and its method containing a base station, several mobile station to be composed of user signal source generating the information bit, a coding modulator, IFFT&CPI device, symbol stage Walsh spread spectrum device, front end of RF transmitting, transmitting antenna, receiving antenna, RF receiving front end, symbol stage Walsh demodulator amplifier, CPD&FFT and channel demodulator decoder and user sink. The invention can effectively overcome the shortage using pseudorandom (PN) codes identifying uses in the CDMA system.

Description

technical field [0001] The present invention relates to a mobile communication system, more specifically to a data transmission device and a method in a multi-user interference Orthogonal Frequency Division Multiplexing OFMA communication system. Background technique [0002] The field of development of personal communication systems provides individuals with personal terminals capable of supporting various services (such as multimedia). Since the formed communication system needs to support multiple users, it is necessary to solve the interference MUI caused by multi-user transmission. There are several ways to solve this problem, and the typical representatives are: assign a specific frequency band to each address, which is called frequency division multiple access FDMA, such as the advanced mobile phone system AMPS launched by the United States in 1978. There will be co-channel interference in the frequency set reuse system; each address is assigned a specific time period...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/32
Inventor 付伟刘建周宗仪郭磊朱光喜
Owner 武汉汉网高技术有限公司