On the performance evaluation of TH and DS UWB MIMO systems

Siriwongpairat, W. Pam; Olfat, M.; Liu, K.J.R.

doi:10.1109/wcnc.2004.1311826

Cited by 29 publications

(11 citation statements)

References 11 publications

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“…Ultrawide-band impulse radio (UWB-IR) technology [1], [2] and multiple-input multiple-output (MIMO) systems [3], [4] have attracted interest regarding their use in nextgeneration high-speed radio communication, and the use of MIMO ultrawide-band (MIMO-UWB) systems for higherspeed radio communication has been examined [5], [6]. In MIMO-UWB systems, intersymbol interference (ISI) usually occurs because of the wide-band transmission, and co-channel interference (CCI) occurs because independent signals are transmitted from multiple transmitting antennas.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments

Takahashi

Nishimura

Ogawa

et al. 2009

IEICE Trans. Commun.

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SUMMARYUltrawide-band impulse radio (UWB-IR) technology and multiple-input multiple-output (MIMO) systems have attracted interest regarding their use in next-generation high-speed radio communication. We have studied the use of MIMO ultrawide-band (MIMO-UWB) systems to enable higher-speed radio communication. We used frequency-domain equalization based on the minimum mean square error criterion (MMSE-FDE) to reduce intersymbol interference (ISI) and co-channel interference (CCI) in MIMO-UWB systems. Because UWB systems are expected to be used for short-range wireless communication, MIMO-UWB systems will usually operate in line-of-sight (LOS) environments and direct waves will be received at the receiver side. Direct waves have high power and cause high correlations between antennas in such environments. Thus, it is thought that direct waves will adversely affect the performance of spatial filtering and equalization techniques used to enhance signal detection. To examine the feasibility of MIMO-UWB systems, we conducted MIMO-UWB system propagation measurements in LOS environments. From the measurements, we found that the arrival time of direct waves from different transmitting antennas depends on the MIMO configuration. Because we can obtain high power from the direct waves, direct wave reception is critical for maximizing transmission performance. In this paper, we present our measurement results, and propose a way to improve performance using a method of transmit (Tx) and receive (Rx) timing control. We evaluate the bit error rate (BER) performance for this form of timing control using measured channel data. key words: MIMO-UWB, LOS (line-of-sight) environment, frequencydomain equalization, transmit and receive timing control

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments

Takahashi

Nishimura

Ogawa

et al. 2009

IEICE Trans. Commun.

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“…In particular, a large number of propagation paths between transmit and receive antennas can be utilized to combat channel fading effect and gain link reliability. It [6]. The authors in [5], [6] suggested the UWB ST coded system by using two transmit antennas and orthogonal designs.…”

Section: Introductionmentioning

confidence: 99%

“…It [6]. The authors in [5], [6] suggested the UWB ST coded system by using two transmit antennas and orthogonal designs. Therefore, in this paper, we consider the performance of different modulated UWB signals in the MIMO system over flat Nakagami-m fading UWB channel model.…”

Section: Introductionmentioning

confidence: 99%

M-ary Signals in UWB MIMO System Using Orthogonal Space Time Block Codes

Hou

Lee

2006

2006 International Conference on Communication Technology

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Ultra Wideband (UWB) communication system and MIMO transmission technique recently have attracted much attention. Space time block coding combines with UWB M-ary PSK and M-QAM modulation schemes for the use of multiple transmit antennas providing a simple transmit diversity scheme with the same diversity order as maximal ratio receiver combing. Using the equivalent single input single out (SISO) model, we present a closed form expression for the exact symbol error rate (SER) of orthogonal space time block codes (STBCs) over UWB flat Nakagami-m models.

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“…To exploit the advantages of both UWB and MIMO systems, UWB-MIMO systems have been proposed [7,8,9,10]. The authors in [7] suggested an UWB-ST-coded system based on the repetition code, which is a special case of what we present in this work.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Comparison of Time-Hopping and Direct-Sequence UWB-MIMO Systems

Siriwongpairat

Olfat

Liu

2005

EURASIP J. Adv. Signal Process.

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We analyze the performance of ultra-wideband (UWB) multiple-input multiple-output (MIMO) systems employing various modulation and multiple access (MA) schemes including time-hopping (TH) binary pulse-position modulation (BPPM), TH binary phase-shift keying (BPSK), and direct-sequence (DS-) BPSK. We quantify the performance merits of UWB space-time (ST) systems regardless of specific coding scheme. For each modulation technique, we introduce a framework that enables us to compare UWB-MIMO systems with conventional UWB single-input single-output (SISO) systems in terms of diversity and coding gains. We show that the combination of ST coding and RAKE receiver is capable of exploiting spatial diversity as well as multipath diversity, richly inherent in UWB environments. In addition, we adopt the real orthogonal design (ROD) as the engine code for UWB-ST codes. We find the upper bound of the average pairwise error probability (PEP) under the hypothesis of quasistatic Nakagami-m frequency-selective fading channels. The performance comparison of ROD-ST codes with different rates is also addressed. Finally, simulation results are presented to support the theoretical analysis.

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On the performance evaluation of TH and DS UWB MIMO systems

Cited by 29 publications

References 11 publications

Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments

Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments

M-ary Signals in UWB MIMO System Using Orthogonal Space Time Block Codes

Performance Analysis and Comparison of Time-Hopping and Direct-Sequence UWB-MIMO Systems

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