Method and system for communicating data symbols in a network

A data symbol and data transmission technology, applied in transmission systems, digital transmission systems, radio transmission systems, etc., can solve problems such as the limitation of maximum spectrum efficiency and the poor performance of incoherent MIMO dual-selective fading channels

Active Publication Date: 2016-11-09
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, STBC does not perform well for incoherent MIMO dual-selective fading channels due to strong ISI and ICI
Maximum spectral efficiency is severely limited due to severe error floors caused by ISI and ICI

Method used

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  • Method and system for communicating data symbols in a network
  • Method and system for communicating data symbols in a network
  • Method and system for communicating data symbols in a network

Examples

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Embodiment Construction

[0030] System and method overview

[0031] Such as figure 1 As shown, embodiments of the present invention provide a method and system for wireless communication between a transmitter 100 and a receiver 150 via an uncorrelated MIMO dual-selective channel subject to time-varying fading and multipath delay. Time-varying fading causes inter-carrier interference (ICI), while multipath delay causes inter-symbol interference (ISI). The system is capable of sending high-speed data even for situations where the transceiver is moving at extreme speeds, such as mobile phones carried in high-speed trains and airplanes.

[0032] An encoder 110 in transmitter 100 encodes 110 a sequence of data symbols 101 using an error correction code (ECC) 115 to produce encoded data symbols 111 . The encoder may use a capacity-approaching forward error correction (FEC) code, such as a low density parity check (LDPC) code, a turbo code, a repetition accumulation code, or other similar codes. For situa...

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Abstract

A method and system realize reliable wireless communications in non-coherent multiple-input multiple-output (MIMO) doubly-selective channels. The method uses Grassmannian space-time-frequency block codes and an iterative generalized likelihood ratio test (GLRT) with a multi-dimensional basis expansion model (BEM), decision reordering, and a fixed number of surviving candidates. The computational complexity of a non-coherent MIMO equalizer becomes linear as a function of a code length and a size of a modulation alphabet. The codebook, the alphabet size, the bit labeling, and the block power are optimized using worst-case channel statistics or instantaneous channel states. The method can use soft-information feedback from error correction codes, such as low-density-parity-check codes to improve performance.

Description

technical field [0001] The present invention relates generally to digital communications and, more particularly, to transmitting high speed data over wireless communication channels. Background technique [0002] In wireless communication, doubly-selective channels suffer from time-varying multipath fading, which leads to inter-carrier interference (ICI) and inter-symbol interference (ISI) when multi-carrier transmission schemes are employed. This is especially problematic in broadband wireless networks with mobile transceivers, such as vehicular communication networks and millimeter wave cellular networks where the speed of communicating entities can be large and will cause rapid changes in the wireless channel. Adaptive equalization and pilot symbols are often used to compensate for these fading effects. However, considering limited radio frequency resources, pilot symbols reduce spectral efficiency and data transmission rate. Also, pilot symbols are only valid for slowe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L25/03H04B7/04
CPCH04B7/0413H04L1/005H04L1/0054H04L1/0606H04L1/0612H04L1/0625H04L1/0643H04L25/03006H04L25/03171H04L25/03821H04L1/006H04L1/0057H04L25/03216H04L25/03222H04L2025/03426H04L1/0061
Inventor 秋浓俊昭菲利普·奥尔利克
Owner MITSUBISHI ELECTRIC CORP
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