SC-FDMA for multiuser communication on the downlink

Eshwaraiah, Harsha S and Chockalingam, A (2013) SC-FDMA for multiuser communication on the downlink. In: 2013 Fifth International Conference on Communication Systems and Networks (COMSNETS), JAN 07-10, 2013 , Bangalore, INDIA.

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Abstract

Single-carrier frequency division multiple access (SC-FDMA) has become a popular alternative to orthogonal frequency division multiple access (OFDMA) in multiuser communication on the uplink. This is mainly due to the low peak-to-average power ratio (PAPR) of SC-FDMA compared to that of OFDMA. Long-term evolution (LTE) uses SC-FDMA on the uplink to exploit this PAPR advantage to reduce transmit power amplifier backoff in user terminals. In this paper, we show that SC-FDMA can be beneficially used for multiuser communication on the downlink as well. We present SC-FDMA transmit and receive signaling architectures for multiuser communication on the downlink. The benefits of using SC-FDMA on the downlink are that SC-FDMA can achieve i) significantly better bit error rate (BER) performance at the user terminal compared to OFDMA, and ii) improved PAPR compared to OFDMA which reduces base station (BS) power amplifier backoff (making BSs more green). SC-FDMA receiver needs to do joint equalization, which can be carried out using low complexity equalization techniques. For this, we present a local neighborhood search based equalization algorithm for SC-FDMA. This algorithm is very attractive both in complexity as well as performance. We present simulation results that establish the PAPR and BER performance advantage of SC-FDMA over OFDMA in multiuser SISO/MIMO downlink as well as in large-scale multiuser MISO downlink with tens to hundreds of antennas at the BS.

Item Type:	Conference Paper
Series.:	International Conference on Communication Systems and Networks
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE.
Keywords:	Multiuser Downlink; SISO/MIMO ISI Channels; SC-FDMA; OFDMA; PAPR; Frequency Domain Equalization
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	20 Sep 2013 12:19
Last Modified:	20 Sep 2013 12:19
URI:	http://eprints.iisc.ac.in/id/eprint/47236

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