Iterative OSTBC-based Multi-User MIMO Interference Cancellation for Uplink Systems

김진관; Kwangmin Hyun; SangKyu Park

Journal of Knowledge Information Technology and Systems

Abbr : JKITS
2015, 10(1), pp.55-68
Publisher : Korea Knowledge Information Technology Society
Research Area : Interdisciplinary Research

김진관 ¹, Kwangmin Hyun ², SangKyu Park ³

¹한양대학교
²강릉원주대학교
³한양대학교

ABSTRACT

In next-generation wireless communication systems, high-rate data transmission is required with the multimedia contents. Therefore, the wireless communication technology of high channel capacity is required. The Multiple antenna wireless communication systems have recently significant attention due to their higher capacity and better immunity to fading. Multi-user multiple-input multiple-output (MIMO) uplink transmission system has a trade-off between multiplexing and diversity scheme. There are several methods for obtaining the diversity gain in a special space multiplexing technique. Orthogonal space-time block codes (OSTBC) can be obtained diversity gain by reducing the muti-user interference (MUI). In space-time code, OSTBC scheme is the best method to simplify encoding and decoding and improves the diversity gain. This scheme is used by reducing the MUI in a wireless communication system. However, it is only applicable for downlink transmission. In uplink transmission system, one method that tried to reduce MUI using the unitary property of OSTBC configured the same number of receive antennas with the number of users at the base station, and each receive antenna could detect only single user signal. Therefore, even when equipped with multiple number of receive antennas larger than the number of users, receiver diversity gain can not be obtained. In this paper, we propose an interference cancellation detector with a simple decoding structure for a multi-user MIMO uplink transmission system that utilizes the equivalent channel of each user using the special property of the OSTBC. The proposed OSTBC-based interference cancellation algorithm reduces interferences received from the other users, and simultaneously diversity gain can be achieved. The simulation results validate the proposed algorithm in terms of the bit error rate (BER) performance.
KEYWORDS

Interferences, Multiple-input-multiple-output (MIMO), Multi-users, Orthogonal Space Time Block Code (OSTBC), Uplink
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