In this paper we present a new error correction approach for a simple peak-to-average power ratio (PAR) reduction scheme for discrete multi-tone (DMT) systems based on coefficient clipping. The proposed method utilizes existing or intentionally placed redundancy in the frequency domain in form of unused subcarriers. Compared to existing PAR reduction algorithms, all signal processing is perform...

This paper presents a method to mitigate interference on a transmission system by another system with an overlapping frequency band. The systems are uncoordinated so that they cannot be made to transmit in orthogonal coding space. The transmission environment is an interference channel rather than the multiaccess channel often considered in other multiuser detection problems, for instance at th...

In this paper, we propose a new, generalized approach for equalization of discrete multi-tone (DMT) systems, which not only uses redundancy in the time domain by adding a guard interval, but also takes advantage of existing or intentionally placed redundancy in the frequency domain. For this purpose, we replace the one tap frequency equalizer in the DMT receiver by a block equalizer and derive ...

In today's multicarrier modulation systems such as orthogonal frequency division multiplexing (OFDM) or discrete multitone (DMT), modulation is accomplished digitally by the use of the inverse discrete Fourier transform (IDFT). Instead of the IDFT, any other orthogonal transform can be used. In this paper a multicarrier scheme based on extended lapped transforms (ELT) is investigated. With the ...

– The effect of time and frequency offsets in the uplink of an asynchronous multi-user system for wireless communications deploying discrete multi-tone modulation and demodulation is studied through analysis. We give analytical expressions for the multiple access interference generated in such a scenario, we study its statistics, and we emphasize its dependency on the tone assignment algorithm ...

We present an optimal, efficient power allocation algorithm for discrete multitone modulation (DMT). Using efficient lookup table searches and a Lagrange multiplier bisection search, our algorithm converges much faster to the optimal solution than existing techniques and can replace the use of suboptimal methods because of its low computational complexity. A fast algorithm is developed and pseu...

ADSL(Asymmetric Digital Subscriber Line) transmission technology meets internet access requirement quite well and offers telephone companies a technology for connecting virtually all internet users at megabit rates.The ANSI (American National Standara Institute) proposes discrete multitone (DMT) modulation with DFT (discrete Fourier tranasform) bases [l] as the carriers for the ADSL system. Rec...

Abstract The power line channel is characterized by a multi-path behavior. A direct consequence is that Multi-Carrier Modulation (MCM) is generally retained for Power Line Communication (PLC). In addition to OFDM, or equivalently DMT, Wavelet OFDM and OFDM/OQAM have been recently proposed for PLC transmission. In fact, every scheme has its own pros and cons. The most effective way for PLC is to...

A complexity analysis of discrete multitone (DMT) and single-carrier modulation (SCM) in the context of a very high-speed digital subscriber line (VDSL) is presented in this paper. In addition to the traditional arithmetic complexity measures such as the number of multiply-and-accumulate (MAC) operations, we also compute the memory requirements. Furthermore, we normalize these metrics with resp...