Frequency-Domain Transmit Processing for MIMO SC-FDMA in Wideband Propagation Channels

Key Words : SIMO, SC-FDMA, frequency diversity gain, spatial diversity gain, MMSE, ZF ABSTRACTWe investigate BER (Bit Error Ratio) performance according to the gain of spatial and frequency diversities in uplink SC-FDMA of SIMO (Single Input Multiple Output) systems. The main results of the analysis in this paper are as follows. First, we prove that performance of integrated system for considering spatial and frequency

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Section: Mimo(multiple Input Multiple Output) 환경에서unclassified

Analysis of BER According to Spatial and Frequency Diversity Gain in Uplink SC-FDMA with SIMO Systems

Lee

Choi

2014

The Journal of Korea Information and Communications Society

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“…It is well known that the multiple-input multiple-output (MIMO) systems can significantly improve the capacity and reliability of the communication over fading channels using spatial multiplexing and/or space-time coding. Applying MIMO techniques for the SC-FDMA system was considered in [6,7]. The antennas should be well separated to have uncorrelated fading across different antennas.…”

Section: Introductionmentioning

confidence: 99%

Distributed Space-Time/Frequency Coding Schemes for Single-Carrier Frequency Division Multiple Access Systems

Al-nahari

El‐Samie

Dessouky

2011

ISRN Communications and Networking

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The single carrier-frequency division multiple access (SC-FDMA) system is a new system that was adopted in the standardization of the upcoming 3GPP long-term evolution (LTE). Designing diversity-achieving schemes for the SC-FDMA system is a challenging task. The codes adopted should not affect the peak-to-average power ratio (PAPR) among other constraints. In this paper, we consider the design of cooperative diversity schemes for SC-FDMA systems in the uplink direction. Specifically, two relay-assisted distributed space-time/frequency codes are proposed. The proposed distributed space-frequency code (SFC) achieves full spatial diversity in the uplink fast-fading channels, where a diversity of order three can be achieved. The proposed code keeps a low PAPR, which is a good feature of the system. A minimum mean square error (MMSE) decoder is used at the receiver of the destination node. Moreover, we propose a bandwidth-efficient distributed space-time code (STC) for slow-fading relay channels. A decode-and-forward (DF) protocol is used at the relay node, and the possibility of erroneous decoding is taken into account. Simulation results demonstrate the performance improvement of the proposed schemes.

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“…One-tap MMSE-FDE can reduce the ICI and can significantly improve the BER performance compared to coherent rake combining. Instead of using the receive MMSE-FDE, the transmit MMSE-FDE (or pre-MMSE-FDE) [16][17][18][19][20] can be used to improve the BER performance of DS-CDMA. However, with the single use of the transmit FDE or the receive FDE, the BER performance improvement is limited due to the presence of residual ICI after despreading [9 -12, 17].…”

Section: Introductionmentioning

confidence: 99%

Joint transmit/receive one-tap minimum mean square error frequency-domain equalisation for broadband multicode direct-sequence code division multiple access

Takeda

Adachi

2010

IET Commun.

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Multicode direct-sequence code division multiple access (DS-CDMA) can flexibly support multimedia services with various data rates simply by changing the code multiplexing order. The use of simple one-tap frequency-domain equalisation (FDE) at a receiver is known to improve the bit error rate (BER) performance of multicode DS-CDMA in a severe frequency-selective fading environment. However, the BER performance improvement is limited due to the presence of the residual inter-chip interference (ICI). The authors propose a joint transmit/receive minimum mean square error (MMSE) FDE, which carries out one-tap transmit FDE and one-tap receive FDE jointly based on the MMSE criterion. The authors theoretically derive a suboptimal set of transmit and receive FDE weights and investigate the BER performance improvement by computer simulation in a freqeuncy-selective Rayleigh fading channel. The proposed scheme improves the received signal-tointerference plus noise ratio after despreading, and consequently, the BER performance can be significantly improved compared to the conventioal receive MMSE-FDE by (a) making the variations in the equivalent channel gain shallower to reduce the residual ICI for large code multiplexing order U and (b) allocating the transmit power to the frequencies having good condition to improve the received signal-to-noise ratio for a small U. This is conformed by the computer simualtion. Recently, multi-carrier (MC) signal transmission (i.e. orthogonal frequency division multiplexing (OFDM) and MC-CDMA) has been attracting attention [4-7]. In

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Frequency-Domain Transmit Processing for MIMO SC-FDMA in Wideband Propagation Channels

Abstract: show that ZF pre-equalization for SISO SC-FDMA is capable of achieving the Shannon Capacity limit for faded channels, with a BER performance that is identical to an AWGN channel, and that pre-equalized increases the capacity of MIMO SC-FDMA systems.

Cited by 7 publications

References 9 publications

Analysis of BER According to Spatial and Frequency Diversity Gain in Uplink SC-FDMA with SIMO Systems

Analysis of BER According to Spatial and Frequency Diversity Gain in Uplink SC-FDMA with SIMO Systems

Distributed Space-Time/Frequency Coding Schemes for Single-Carrier Frequency Division Multiple Access Systems

Joint transmit/receive one-tap minimum mean square error frequency-domain equalisation for broadband multicode direct-sequence code division multiple access

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