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Method and device for adaptive modulation and coding

An adaptive coding and coding technology, applied in the field of communication, can solve the problems of high software and hardware complexity, large decoding delay, not supporting matrix A format dual-stream transmission, etc.

Active Publication Date: 2010-02-24
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

[0025] 3. For dual-stream transmission in Matrix A format, there are two proposals, but further study is required
This solution inherits all the defects of the solution adopted by the existing IEEE802.16e standard, that is, the first solution mentioned above: high cache, large decoding delay, and high software and hardware complexity, etc.
In the current IEEE 802.16e standard, the dual-stream transmission in the matrix A format adopts the space-time block code technology, which requires an even number of OFDM symbols to be allocated in the time domain; and the allocation of the AMC2×3 slot structure in the time direction The granularity is 3 OFDM symbols, so STBC-based matrix A format dual-stream transmission is not supported

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  • Method and device for adaptive modulation and coding

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Embodiment Construction

[0096] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0097] Figure 4 A schematic diagram of a sending device 400 according to an embodiment of the present invention is given. The sending device 400 supports dual-stream transmission in matrix A format and adopts an AMC2×3 time slot structure.

[0098] At the sending end, the data 410 is channel coded by the channel coding unit 420 and QAM modulated by the QAM modulation unit 430 , and then input to the processing unit 440 suitable for AMC for processing. The AMC-adapted processing unit 440 includes an SFBC encoding unit 442 and AMC2×3 slot mapping units 444-1 and 444-2. The sending device 400 further includes IDFT transformation units 450-1 and 450-2, configured to perform IDFT transformation on the data after slot mapping, and transform it into the time domain. Finally, transmit antennas 460-1 and 460-2 transmit the data to the wireless channel.

[0...

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Abstract

The invention provides a method and a device using space-frequency block codes in an adaptive modulation and coding (AMC) scheme. Data are mapped to a space domain and a frequency domain by the space-frequency block codes, and an even number of sub-carriers are needed only in a frequency direction without limitation in a time direction, so that AMC 2*3 time slot structure not only can support single-current transmission, but also can support double-current transmission in a matrix A format and a matrix B format. Both the single-current transmission and the double-current transmission adopt one set of AMC 2*3 time slot structure, so the method and the device not only greatly reduce implementation cost and simplify the complexity of software and hardware, but also greatly reduce the cachingneeds and the decoding time delay of a system.

Description

technical field [0001] The present invention relates to communication technology, in particular to a method and device for adaptive coding and modulation. Background technique [0002] In order to enhance the performance of the mobile WiMAX (World-wide Inter-operability for Microwave Access) system based on system configuration version 1.0 so as to compete with other systems, such as 3GPP's long-term evolution (LTE: Long-Term Evolution) system , the Service Provider Working Group (SPWG: ServiceProvider Working Group) of the WiMAX Forum proposed higher throughput indicators for WiMAX systems based on system configuration version 1.5, such as 2 transmit antennas, 2 receive antennas and 4 transmit antennas2 For the downlink of the root receiving antenna, the average spectral efficiency of each sector is required to reach 1.3 and 1.8 bits per second per Hz, respectively. [0003] An important measure to achieve these indicators is to adopt the time slot structure of adaptive co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L27/26
CPCH04L27/0012H04L1/0606H04L1/0003H04L5/0064H04L1/0009H04L5/0042H04L5/0023
Inventor 朱孝龙李栋杨红卫
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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