Matched-Transmission Technique for Channels With Intersymbol Interference

Harashima, Hiroshi; Miyakawa, Hiroshi

doi:10.1109/tcom.1972.1091221

Cited by 730 publications

(334 citation statements)

References 4 publications

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“…First, we notice that the two capacity expressions (10) and (11), and (21) and (22) are very similar. Fig.…”

Section: Numerical Comparisonsmentioning

confidence: 80%

“…These results were originally proved for Gaussian channels [6], and have been generalised to other types of causal interference [7][8][9]. Several practical suboptimal implementations of dirty paper coding based on Tomlinson-Harashima (TH) precoding [10,11] have been proposed, for example for digital subscriber line systems [12], for multi-antenna systems [13,14] and CDMA systems [15].…”

Section: Introductionmentioning

confidence: 99%

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Multiuser TH-precoding for TDD–CDMA over multipath channels

2007

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Nonlinear precoding schemes for downlink time-division duplex -CDMA systems over multipath fading channels, are considered. First, the capacity results of a downlink CDMA system with either multiuser detection or precoding, were obtained and compared. It is seen that the two schemes exhibit similar capacity regions for both sum rate and maximum equal rate, which motivates the development of efficient nonlinear transmitter precoding techniques to reduce the receiver complexity at the mobile units without degrading the system performance. We then develop both bit-wise and chip-wise Tomlinson -Harashima (TH) multiuser precoding methods for downlink CDMA with multipath, to remove multi-user interference, inter-chip interference and inter-symbol interference. Efficient algorithms for multiuser power loading and ordering are also developed. Implementation of the proposed TH-precoding schemes in time-varying channels based on channel prediction is addressed as well. Simulations results are provided to demonstrate the effectiveness of the proposed techniques in suppressing interference in downlink CDMA. IntroductionMultiuser detection (MUD) techniques are considered powerful for interference suppression in CDMA systems, especially in uplinks, where the base-station receiver has the knowledge of all users' spreading sequences and channel states, and can perform sophisticated signal processing [1]. In the downlinks, however, the mobile receiver typically has only the knowledge of its own spreading sequence and channel state. Although adaptive linear MUD (either training-based or blind) can be employed for such scenario, the performance can be limited because of the linear constraint on the detector. Moreover, the power constraint of the mobile calls for simple receiver processing. On the other hand, the precoding schemes for downlink CDMA effiectively transfer the signal processing for interference suppression from the mobile receiver to the base-station transmitter. This approach is feasible if the base-station can estimate the downlink channels of all users [e.g. in systems employing time-division duplexing (TDD) where the uplink and downlink channels are reciprocal]. In [2], a precoding method was proposed which is essentially an implementation of the RAKE receiver at the transmitter. Hence this approach does not attempt to mitigate the multiple-access interference (MAI). Recently, different linear precoding techniques have been proposed to combat MAI and inter-chip interference but without considering inter-symbol interference (ISI) [3,4]. If the ISI is present then the complexity of these techniques becomes prohibitive since the dimension of the matrix filter is proportional to the data frame length multiplied by the number of users (i.e. block processing). More recently, bit-wise linear precoding methods have been proposed to reduce the precoding complexity in the presence ISI [5]. The downlink CDMA is a special case of broadcast channels. There has been significant recent interest in characterising the ca...

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“…First, we notice that the two capacity expressions (10) and (11), and (21) and (22) are very similar. Fig.…”

Section: Numerical Comparisonsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Multiuser TH-precoding for TDD–CDMA over multipath channels

2007

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“…Although DPC only remains as a theoretical benchmark due to its high complexity implementation, our consideration of DPC potentially allows the multicell network to realize extra performance from the nonlinear precoding over the linear precoding. The achievable rate by DPC then can be used as the benchmark for practical nonlinear precoding techniques, such as Tomlinson-Harashima precoding (THP) [16] and vector perturbation (VP) [17]. Since the maximization of WSR in a multicell MIMO-BC with DPC is shown to be a nonconvex problem, finding its globally optimal solution is computationally complex.…”

Section: Copyright Cmentioning

confidence: 99%

Sum-rate maximization in the multicell MIMO broadcast channel with interference coordination

Nguyen

Le‐Ngoc

2013

2013 IEEE International Conference on Communications (ICC)

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Abstract-This paper studies the precoding designs to maximize the weighted sum-rate (WSR) in a multicell multiple-input multiple-output (MIMO) broadcast channel (BC). We consider a multicell network under universal frequency reuse with multiple mobile stations (MS) per cell. With interference coordination (IC) between the multiple cells, the base-station (BS) at each cell only transmits information signals to the MSs within its cell using the dirty paper coding (DPC) technique, while coordinating the inter-cell interference (ICI) induced to other cells. The main focus of this work is to jointly optimize the encoding covariance matrices across the BSs in order to maximize the network-wide WSR. Since this optimization problem is shown to be nonconvex, obtaining its globally optimal solution is highly complicated. To address this problem, we consider two low-complexity solution approaches with distributed implementation to obtain at least locally optimal solutions. In the first approach, by applying a successive convex approximation technique, the original nonconvex problem is decomposed into a sequence of simpler problems, which can be solved optimally and separately at each BS. In the second approach, the WSR problem is solved via an equivalent problem of weighted sum mean squared error minimization. Both solution approaches will unfold the control signaling among the coordinated BSs to allow their distributed implementation. Simulation results confirm the convergence of the proposed algorithms, as well as their superior performances over schemes with linear precoding or no interference coordination among the BSs.

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“…2. THP is a feedback filter having a nonlinear modulo operator [7]. The modulo operator is used to prevent the transmit signal amplitude increase.…”

Section: Joint Thp/pre-fdementioning

confidence: 99%

“…Recently, Tomlinson-Harashima precoding (THP) [6,7] has been attracting much attention as an effective technique to suppress the interference [8,9]. In Refs.…”

Section: Introductionmentioning

confidence: 99%

BER Performance of Joint THP/pre-FDE

Takeda

Tomeba

Adachi

2008

VTC Spring 2008 - IEEE Vehicular Technology Conference

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Abstract-Recently, frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion has been attracting much attention to overcome the frequency-selective fading channel. The bit error rate (BER) performance of singlecarrier (SC) transmission is significantly improved by using MMSE-FDE by obtaining the frequency-diversity gain while suppressing the inter-symbol interference (ISI). However, the residual ISI after MMSE-FDE limits the performance improvement. Recently, we have proposed a joint use of Tomlinson-Harashima precoding (THP) and FDE reception (joint THP/FDE) to suppress the residual ISI. However, joint THP/FDE requires the channel state information (CSI) at both the transmitter and receiver. In this paper, we replace FDE reception by pre-FDE and propose joint THP/pre-FDE that requires the CSI at the transmitter only, while providing almost the same BER performance as joint THP/FDE.

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Matched-Transmission Technique for Channels With Intersymbol Interference

Cited by 730 publications

References 4 publications

Multiuser TH-precoding for TDD–CDMA over multipath channels

Multiuser TH-precoding for TDD–CDMA over multipath channels

Sum-rate maximization in the multicell MIMO broadcast channel with interference coordination

BER Performance of Joint THP/pre-FDE

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