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Uplink multiple access method capable of automatically adapting to channel characteristic variation

A technology of channel characteristics and access methods, applied in the directions of multi-frequency code system, multiplexing communication, orthogonal multiplexing system, etc., to improve spectrum efficiency, resist Doppler spread, and meet the requirements of high-speed mobile communication Effect

Inactive Publication Date: 2012-07-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

[0017]The biggest disadvantage of CP-OFDMA system is:
[0035] Although this type of OFDM / OQAM system has the characteristics of flexible selection of shaping filters, because it does not use the channel information fed back from the downlink, for a given In the transceiver system, in the sending step 4 and the receiving step 2, that is, only the selected shaping filter and matching filter can be used at the sending end and the receiving end, and the shaping filter cannot be automatically adjusted according to the characteristics of the channel. , so the overall performance has large fluctuations and poor stability; in addition, the OFDM / OQAM system is a single-user system and cannot be directly used in multiple access systems

Method used

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  • Uplink multiple access method capable of automatically adapting to channel characteristic variation
  • Uplink multiple access method capable of automatically adapting to channel characteristic variation
  • Uplink multiple access method capable of automatically adapting to channel characteristic variation

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Embodiment Construction

[0064] This specific implementation mode takes the following system conditions as an example: the number of subcarriers in the OFDMA / OQAM system is 1024, a total of 32 users, the current user uses the 0th to 31st subcarriers, and the selection range of the shaping window filter is the EGF function sequence shaping filter .

[0065] System initialization processing: first store the same EGF function sequence shaping filter (expansion factor α=[0.1, 0.2, ..., 0.9, 1, 1.1, ... , 2.9, 3]), and establish corresponding rules at the sending and receiving ends;

[0066] The process is as follows:

[0067] A. Sending end (mobile station):

[0068] A 1 .Select the shaping filter that matches the current channel characteristics: the sending end sends out a start command, and the receiving end (base station) sends a data packet containing a pilot sequence to the sending end (mobile station) according to the instruction, and the sending end (mobile station) receives After sending the i...

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Abstract

The invention belongs to an uplink multiple access technology capable of automatically adapting to channel characteristic variation in network access technologies. The invention comprises system initialization processing, which includes the following processes: a transmitting end: selecting a shaping filter matched with the characteristics of the current channel, quadrature amplitude modulating the send information, zero insertion processing, orthogonalization phase mapping, multi-carrier modulating, signal shaping and sending the signal; and a receiving end: processing the receiving signal, selecting the shaping filter matched with the characteristics of the channel, multi-carrier modulating, de-orthogonalization phase mapping, extracting valid data, isostatic compensating and storing the data. Because OQAM (technology) is introduced into OFDMA (technology) and the shaping filter with good time-frequency focusing characteristic is adopted to substitute for cyclic prefix, the invention has the characteristics of effectively improving the spectrum efficiency, system capacity and data transmission performance and resisting Doppler expansion, reducing the disturbance between users and distortion of the signal in the channel, better satisfying the requirement of high-speed mobile communications and the like.

Description

technical field [0001] The present invention belongs to the multiple access uplink technology of Orthogonal Frequency Division Multiplexing (OFDM / OQAM, Orthogonal Frequency Division Multiplexing / Offset Quadrature Amplitude Modulation) system based on interleaved quadrature amplitude modulation, especially a kind of can automatically adapt to the change of channel characteristics The uplink multiple access technology is especially suitable for uplink multiple access systems that require high spectrum efficiency and high-speed environments. Background technique [0002] Orthogonal Frequency Division Multiple Access (OFDMA, Orthogonal Frequency Division Multiple Access) is a multiple access technology based on an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) system. Its core is to realize multi-user access by assigning part of available subcarriers to each user. OFDMA does not need to use guard frequency bands to distinguish dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 胡苏武刚李腾肖悦李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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