Method for compatible OFDM technology by TD-SCDMA system

A TD-SCDMA technology, applied in the field of TD-SCDMA system compatible with OFDM, can solve the problem of reducing spectrum utilization

Inactive Publication Date: 2005-11-09
上海贝豪通讯电子有限公司
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  • Method for compatible OFDM technology by TD-SCDMA system
  • Method for compatible OFDM technology by TD-SCDMA system
  • Method for compatible OFDM technology by TD-SCDMA system

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Embodiment Construction

[0070] The present invention provides a method for TD-SCDMA compatible OFDM technology, and the specific scheme is as follows: In the TD-SCDMA system, in order to ensure the reliable transmission of data on the wireless link, the physical layer first needs to perform the data flow from the MAC and the upper layer. Coding / multiplexing, and after physical channel mapping, the data on the channel will be spread spectrum and scrambled. Spread spectrum multiplies the channel data by a sequence of numbers higher than the data bit rate. The result of the multiplication expands the bandwidth of the signal, converting the bit rate data stream to a chip rate data stream. Spread spectrum processing is also commonly referred to as channelization operation, and the sequence of numbers used is called a channelization code, which is a set of codes that can vary in length but still be mutually exclusive. The scrambling code is similar to the spread spectrum, and it also uses a digital sequenc...

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Abstract

This invention discloses a method for TD-SCDMA compatible with OFDM technology, which carries out serial parallel conversion to the due-out high speed serial code sheet sequence and generates multiple parallel sub-sequences to be modulated to multiple sub-carriers for parallel transmission to reduce the transmit rate of each channel so as to increase the symbol period and weaken the influence of multi-channel interference, at the same time, it uses the circular prefix as the protection interval, the interference among symbols are reduced greatly and the orthogonality among channels are ensured.

Description

Technical field: [0001] The present invention relates to a communication system, in particular to a method for a TD-SCDMA system compatible with Orthogonal Frequency Division Multiplexing (OFDM) technology. Background technique: [0002] IMT-2000 is the third generation mobile communication system proposed by the International Telecommunication Union (ITU), and TD-SCDMA is one of the mainstream standards. standard. TD-SCDMA system has its outstanding characteristic: It is the only time division duplex (TDD) method among the three mainstream standards of the third generation mobile communication system, which has greater flexibility in spectrum utilization. The system comprehensively adopts advanced technologies in wireless communication such as smart antenna, synchronous code division multiple access (CDMA), joint detection, software radio, etc., so that the system has high performance and spectrum utilization. [0003] Because TD-SCDMA system adopts CDMA technology, it wi...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 苏鹏程
Owner 上海贝豪通讯电子有限公司
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