Cascade emission method of channel coding and space time coding

Abstract

The invention discloses a method for cascade-emitting communication channel codes and space-time codes in a multi-input multi-output frequency division multiplexing system. The method of the invention comprises: firstly, encoding information bits which are outputted by a information source in communication channel by an originating end and obtaining information bits and check bits, then, confirming whether the originating end needs carrying out second deletion or not according to the transmitting aerial number n and the average number of pilot frequencies which are needed by each sub-belt andconfirming the order of a first deletion, the second deletion and interlace according to an interlace mode, modulating binary sequences which are obtained by the originating end and obtaining modulation symbols, transforming the modulation symbols from parallel to serial by the originating end, carrying out space-time encoding, and obtaining code words after encoding, and finally mapping the codewords and the pilot frequency on different sub-carrier waves by the originating end and emitting through n strips of transmitting aerials. The MIMO+OFDM not only can obtain coding gains of the communication channel codes to the maximum but also can obtain diversity gains of the space-time codes through utilizing the invention.

Description

technical field [0001] The present invention relates to a system coding transmission method, in particular to a cascade transmission method of channel coding and space-time coding in a multi-input multi-output orthogonal frequency division multiplexing system. Background technique [0002] Multi-antenna (MIMO) is an efficient wireless transmission technology developed in recent years, which refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end, respectively. The traditional communication system is a single-input-single-out SISO system. MISO and SIMO based on transmit diversity and receive diversity are also special cases of MIMO. The basic idea of ​​MIMO is to use multiple antennas at both ends of transmitting, receiving or transmitting and receiving, and make full use of the independent fading characteristics between channels through space-time processing technology to improve spectrum utilization, communication...

AI Technical Summary

Problems solved by technology

In this way, by completing the operation of transmitting space-time codes on time and subcarriers, although the transmission cycle required to complete the transmission of space-time codes is reduced, thereby reducing the impact of channel correlation time on space-time code transmission, avoiding the channel fading coefficient The performance loss of space-time code transmission caused by changes in a space-time coding operation, but also does not involve the channel coding and space-time coding cascade for space-time transmission scheme

Images