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Method and device for adaptive modulation and coding

An adaptive encoding and encoding technology, applied in the field of communication, can solve problems such as high software and hardware complexity, high cache, and non-support for dual-stream transmission.

Active Publication Date: 2013-02-13
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

[0026] 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 IEEE802.16e 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 time slot structure of AMC2×3 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
  • Method and device for adaptive modulation and coding
  • Method and device for adaptive modulation and coding

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Embodiment Construction

[0097] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0098] 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.

[0099] 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

A method and device using Space-Frequency Block Coding in Adaptive Modulation and Coding (AMC) scheme. The data is mapped to spatial domain and frequency domain with Space-Frequency Block Coding. Only even number of sub-carriers is needed in frequency direction, and there is no limit to time direction. So AMC 2×3 time slot structure can not only support single stream transmission, but also support double stream transmission which includes matrix A format and matrix B format.

Description

technical field [0001] The present invention relates to communication technology, and in particular, to a method and apparatus 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 the system configuration version 1.0 in order 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 targets for the WiMAX system based on system configuration version 1.5, such as 2 transmit antennas, 2 receive antennas, and 4 transmit antennas. For the downlink of the root receive antenna, the average spectral efficiency per sector is required to reach 1.3 and 1.8 bits per second per Hz, respectively. [0003] In order to achieve these targets, an important measure is to adopt the time slot structu...

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Application Information

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Patent Type & Authority Patents(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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