Abstract
One of the advantages of Multiple-Input Multiple-Output (MIMO) techniques is that they can provide link throughput, but the reliability of them remains to be improved. In order to improve the performance of bit error, based on the decomposed model of continuous phase modulation (CPM), combined with LDPC code and random interweaver, a scheme of joint coded modulation is introduced. In this paper, the model of LDPC-CPM iterative MIMO system is established firstly, then scheme of receiver by iterative detection realized and the decoding is proposed, finally the effect of main parameters on the performance of the system is studied, which can provide the reference basis for practical application. The research results show that the proposed scheme can improve channel capacity and BER performance in the background of extremely low SNR effectively, and give attention to both high-speed transmission and reliable transmission.
Highlights
Multiple-Input Multiple-Output (MIMO) technology has been attractive in wireless communications [1] [2], compared with conventional communication systems, which are called Single-Input Single-Output (SISO) systems, the use of multiple antennas provides means for simultaneous transmissions and spatial redundancy to the transmitted signals that helps to improve the throughput performance of MIMO over SISO [3].It becomes appealing when the MIMO scheme is concatenated with LDPC code
The linear modulation schemes have been investigated in many MIMO architectures; the constant envelope modulation formats such as continuous phase modulation (CPM) [7] are more suitable for implementation in wireless system due to their high power amplifiers
It can be seen that CPM signals can be determined by the current input Un and previous L −1 input Un−L+1,...,Un−1 as well as their accumulation completely, so any CPM scheme can be divided into a continuous phase encoder (CPE) and a memoryless modulator (MM) [11]
Summary
MIMO technology has been attractive in wireless communications [1] [2], compared with conventional communication systems, which are called Single-Input Single-Output (SISO) systems, the use of multiple antennas provides means for simultaneous transmissions and spatial redundancy to the transmitted signals that helps to improve the throughput performance of MIMO over SISO [3] It becomes appealing when the MIMO scheme is concatenated with LDPC code. Consider memory and recursive nature of highly efficient CPM technique, combined with external LDPC codes and random interweaver to build a new MIMO system based on a joint coded modulation scheme, an iterative detection and decoding receiver is proposed.
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