Efficient, high-performance and low-complexity orthogonal frequency-division multiplexing index modulation transmission method

Abstract

The invention discloses an efficient, high-performance and low-complexity orthogonal frequency-division multiplexing index modulation (OFDM-IM) transmission method, which is a subcarrier mapping method combining bit-padding and dual-mode modulation on the basis of a traditional OFDM-IM combined method, wherein the method not only comprises all sub-carrier combinations, but also has dual mode characteristics, so that the method is an efficient transmission scheme. The scheme of the invention also uses the interweaving technology and the hard-limiting technology to improve the bit error rate performance of a system and reduce the detection complexity of modulation symbols, and the scheme is an efficient, high-performance and low-complexity OFDM-IM transmission scheme.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method for constructing a signal at a transmitting end of a wireless communication system and a method for detecting a signal at a receiving end, in particular to a transmission scheme for an orthogonal frequency division multiplexing index modulation system. Background technique [0002] As a unique digital communication technology, Orthogonal Frequency Division Multiplexing (OFDM) has many advantages, including the ability to provide high-speed data transmission, mainly by dividing serial data into many low-speed parallel data streams; Provides a low-complexity, high-performance solution to intersymbol interference caused by dispersive channels. Because of these advantages, OFDM is adopted by many broadband wireless standards, such as 802.11a / g Wi-Fi, 802.16WiMAX and LTE. [0003] The concept of index modulation is related to the principle of spatial modulatio...

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Problems solved by technology

However, these two algorithms have a common shortcoming, that is, they cannot make full use of all subcarrier activation schemes, unless the number of the schemes is a power of 2, and it is proposed to use unequal length bits to correspond to all activation schemes. scheme so that the receiving end does not detect a non-used active scheme

However, the code activation scheme using unequal length bits is not conducive to the detection of the receiving end, and will reduce the bit error rate performance of the system. For this, the number of bits corresponding to the traditional amplitude phase modulation is changed so that the information bits carried by an OFDM packet remain unchanged. change, this scheme is beneficial to detection but the transmission efficiency is not improved compared with the traditional OFDM system

[0005] In addition to the above-mentioned difficulties, how to improve the transmission efficiency of the OFDM-IM system is currently mainly using dual-mode modulation, but this solution uses the LLR detection algorithm when detecting at the receiving end, which uses traversal search when detecting modulation symbols algorithm, which is too complex at higher order modulation

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