Downlink Throughput Enhancement of a Cellular Network using Two-Hop User-Deployable Indoor Relays

作者：Devar Sendilramkumar^*; Karthik K S; Ramamurthi Bhaskar; Koilpillai R David

来源：IEEE Journal on Selected Areas in Communications, 2013, 31(8): 1607-1617.

DOI：10.1109/JSAC.2013.130822

• Indoor
• two-hop
• relays
• user-deployable
• hetnets
• equalize-and-forward
• interference management
• HRPD
• repeaters

In this paper, we propose two-hop user-deployable indoor relays for CDMA systems with signal bandwidth 5 MHz or less. We assume concurrent relaying wherein macro base stations (BS) are allowed to transmit when a relay is forwarding. The two-hop indoor relay is studied using a generalized model for outdoor-to-indoor communication in a frequency-selective channel in the presence of co-channel interference. We propose an equalize-and-forward relay that employs multiple-antenna interference-aware equalization before forwarding. We present a unified solution to minimize interference (due to concurrent transmissions) at the relay-served destination and the BS-served destination, using power control and exploiting spatial reuse. A systematic method to enable indoor relays with the proposed interference management solutions is presented that is applicable to existing CDMA systems, without additional requirements in Access Terminal (AT)/User Equipment. Simulation results in the context of High Rate Packet Data (HRPD) CDMA network shows that the ATs served through the indoor relays experience throughput improvement by at least a factor of two, whereas the ATs served by the BS experienced a gain of around 6% in spite of concurrent relaying. The results also show an overall system throughput gain upto 30% when compared to the existing network with only single hops.

• 出版日期2013-8