Turbo receiver with hybrid interference cancellation for coded V-BLAST system

Abstract

In this paper, we investigate and research turbo coding for Bell Lab's Layered Space Time (BLAST) system and propose its encoding and decoding structure. Vertical BLAST (VBLAST) is a important method among BLAST to improve greatly system channel capacity, but because of its interference between transmit antennas, BER (FER) is sharply decreasing. At the receiver, we apply iterative ordered zero-forcing hybrid interference cancellation (IOZF-HIC). Comparing to ordered zero-forcing serial interference cancellation (OZF-SIC) and iterative zero-forcing parallel interference cancellation (IZF-PIC), IOZF-HIC provides better BER and FER performance with lower complexity. Soft-information through IOZF-HIC is sent to turbo iterative decoding and the resulting hard-information can be given to VBLAST again to provide prior information and renew soft-information of IOZF-HIC, then do again. So, turbo-VBLAST has the character of double-iterated concatenated decoding structure. The simulation results are presented to verify its advantages