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Dynamic tone grouping and encoding for multi-carrier quadrature amplitude modulation in ofdm

A dual-carrier modulation and tone technology, applied in multi-carrier systems, modulated carrier systems, amplitude-modulated carrier systems, etc., can solve data error-prone and other problems

Active Publication Date: 2011-10-19
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, data received on subcarriers with higher fading (i.e., attenuation) is more error-prone than data received on subcarriers with lower attenuation

Method used

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  • Dynamic tone grouping and encoding for multi-carrier quadrature amplitude modulation in ofdm
  • Dynamic tone grouping and encoding for multi-carrier quadrature amplitude modulation in ofdm
  • Dynamic tone grouping and encoding for multi-carrier quadrature amplitude modulation in ofdm

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Embodiment Construction

[0028] In the following, some embodiments of the present invention will be referred to in detail in conjunction with the corresponding figures.

[0029] figure 2 It is a schematic block diagram of the transmitter 21 and the receiver 31 in the wireless OFDM system 20 according to one novelty. On the transmitter side, the transmitter 21 comprises a demultiplexer 22, a plurality of channel encoders (eg, 23-24 as described), an interleaver 25, a MC-QAM and DTG block 26 and an IFFT and CP insertion block 27 , where the demultiplexer 22 demultiplexes the input data 28 (for example, a bit sequence) into multiple parallel bit streams, multiple channel encoders encode the bit streams into different coded blocks, and the deinterleaver 25 demultiplexes the already The coded bit stream is interleaved, the MC-QAM and DTG block 26 modulates the coded and interleaved bit stream into QAM symbols and maps the QAM symbols to OFDM subcarriers (i.e., frequency tone), and the IFFT and CP inserti...

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Abstract

The invention provides a transmitter, a method for the transmitter and a subcarrier pairing method. The method for the transmitter firstly includes that a sequence of coded and interleaved bits is de-multiplexed into a number of bit-streams. Each bit-stream is mapped into a sequence of Quadrature Amplitude Modulation (QAM) symbols, which are grouped into non-overlapping sets of QAM symbols. Unitary transformation is then applied on the QAM symbols to produce groups of complex signals. Finally, the complex signals are dynamically mapped to subcarrier groups based on tone mapping information to improve link performance. The tone mapping information is derived from information associated with each OFDM subcarrier, such as Channel State Information (CSI). The OFDM subcarriers are grouped into subcarrier groups according to the tone mapping information such that the channel quality of each subcarrier group is balanced. The inventive transmitter, the method for the transmitter and the subcarrier pairing method can improve the whole efficiency of the channel link.

Description

[0001] Related Application Citations [0002] This application claims priority under 35 U.S.C. §119 to the U.S. Provisional Application No. 61 / 290,409, filed December 28, 2009, entitled "Dynamic Tone Grouping Method for Multi-Carrier Quadrature Amplitude Modulation in OFDM" ;Application No. 61 / 290,971 filed on December 30, 2009, entitled "OFDM Transmission with Dynamic Tone Group Scheme Using Reduced Signaling Overhead", a US provisional case. The subject matter of these applications are hereby incorporated by reference. technical field [0003] The disclosed embodiments of the present invention generally design transmitter (transmitter) and receiver (receiver) design, and more specifically, relate to dynamic tone carrier for multi-carrier quadrature amplitude modulation (Quadrature Amplitude Modulation, MC-QAM) in OFDM system Grouping (Dynamic Tone Grouping, DTG). Background technique [0004] Multipath fading, also known as wideband fading, significantly affects the thr...

Claims

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Application Information

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IPC IPC(8): H04W74/00H04L27/02
CPCH04L1/0041H04L27/2627H04L27/36
Inventor 维沙肯·波南巴勒姆洪崑健
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE
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