Infinite length results for channel shortening equalizers

Martin, Richard R.; Johnson, C.R.; Ding, Ming; Evans, Brian L.

doi:10.1109/spawc.2003.1318940

Cited by 9 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using Eqs (1)(2)(3)(4)(5), the noise signals AWGN, NEXT, FEXT were modeled. Table 3 shows the NEXT and FEXT power for all loops.…”

Section: Noise Modeling Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A New Approach of Digital Subscriber Line2 Initialization Process

Khmiss¹,

Akrm²

2010

IJACT

View full text Add to dashboard Cite

In this paper, a design for Asymmetric Digital Subscriber Line (ADSL)/Asymmetric Digital Subscriber Line2 (ADSL2) Initialization Process is presented which can be applied to different telephone network. Such a proposal can face the different types of noise over DSL channels, the most important types are Background and Crosstalk noises and Inter symbol interference (ISI) which is eliminated by using Time Domain Equalizer (TEQ). The Minimum Mean Square Error (MMSE) algorithm is implemented as TEQ algorithm. The initialization process where tested on American National Standard Institute (ANSI) defines 8 Carrier Serving Area (CSA) test loops for ADSL service. As a result, 9.02 Mbps and 9.42 Mbps were achieved over CSA loop-2 for ADSL and ADSL2 respectively. The TEQ efficiency for 8 CSA test loop are calculated where it achieved 93.1% of zero ISI for CSA power shows that NEXT have higher power and narrow band where NEXT powers were (-45.593) dBm for all loops and FEXT were ranging from (-76.353 to -68.261) dBm for the 8 loops. Finally the results show that ADSL2 outperforms ADSL by about 400Kbps which about 1.1%.

show abstract

“…Using Eqs (1)(2)(3)(4)(5), the noise signals AWGN, NEXT, FEXT were modeled. Table 3 shows the NEXT and FEXT power for all loops.…”

Section: Noise Modeling Resultsmentioning

confidence: 99%

“…The latest developments in ADSL are ADSL2 and ADSL2+, which define new applications, services and deployment scenarios. The first issue it has to deal with is a wide range of used cables in telephone loop plant also a varying length of loops from few hundred of feet to 18000 feet [1]. The modem should adept well with these changes.…”

Section: Introductionmentioning

confidence: 99%

A New Approach of Digital Subscriber Line2 Initialization Process

Khmiss¹,

Akrm²

2010

IJACT

View full text Add to dashboard Cite

show abstract

“…The MC-CDMA scheme (multiple access divisible by multi-carrier code) makes it possible to simultaneously exploit the advantages of CDMA and OFDM, a multi-carrier modulation scheme. The MC-CDMA system is considered one of the potential candidates considered to be capable of meeting the requirements of next-generation (4G) [1][2][3][4][5][6] high-speed wireless multimedia communication systems and Long Trem Evolution (LTE).…”

Section: Introductionmentioning

confidence: 99%

The Channel Shortening comparison between OFDM & MC-CDMA System over an ADSL Channel using a Water-filling

fatima¹

2019

IJECE

View full text Add to dashboard Cite

<p>In this paper our objective focuses on the development of digital transmission techniques in order to solve the problem of Inter-Symbol Interference (ISI) due to multiple paths and the improvement of Multi-Carrier Code Division Multiple Access (MC-CDMA) system performance. The both algorithm: MERRY algorithm (Multicarrier Equalization by Restoration of Redundancy) called TEQ (Time domain EQualizer) and the power allocation method to allocate appropriate power to each user (Water-filling technique (WF)) [1] is used. Finally, the numerical results show that combining Water Filling with TEQ technique allows to reduce the ISI for MC-CDMA systems.</p>

show abstract

“…Mathematically we reach the same optimum as the original one but with fewer computations when searching for optimal delay. The new Y is a positive definite matrix [6] and a Cholesky decomposition Y = LL T can be performed. The modified min-ISI has a cost function as…”

Section: B Review Of the Min-isi Methodsmentioning

confidence: 99%

“…Again, bit rate performance varies widely with TEQ length. At some point, longer TEQs start killing subcarriers [6].…”

Section: Introductionmentioning

confidence: 99%

Minimum intersymbol interference methods for time domain equalizer design

Ding

Evans

Martin

et al.

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489)

Self Cite

View full text Add to dashboard Cite

Abstract-During initialization, discrete multitone receivers train a time domain equalizer (TEQ) to shorten the channel impulse response to a preset length, ν + 1. Arslan, Kiaei, and Evans report a Minimum Intersymbol Interference (Min-ISI) method for TEQ design. Min-ISI TEQs give the highest bit rates among single-FIR TEQs amenable to real-time implementation on programmable fixed-point digital signal processors (DSPs). The Min-ISI method, however, has several disadvantages: (1) sensitivity to transmission delay, (2) inability to design TEQs longer than ν + 1 taps, and (3) sensitivity to the fixed-point computation in the Cholesky decomposition. In this paper, we develop an alternate Min-ISI cost function, from which we derive (1) a fast search method for the optimal transmission delay, (2) extensions to design arbitrary-length Min-ISI TEQs, and (3) an iterative Min-ISI method. The iterative Min-ISI method avoids Cholesky decomposition, designs arbitrary length TEQs, and achieves the bit rate performance of the original Min-ISI method.

show abstract

Infinite length results for channel shortening equalizers

Cited by 9 publications

References 17 publications

A New Approach of Digital Subscriber Line2 Initialization Process

A New Approach of Digital Subscriber Line2 Initialization Process

The Channel Shortening comparison between OFDM & MC-CDMA System over an ADSL Channel using a Water-filling

Minimum intersymbol interference methods for time domain equalizer design

Contact Info

Product

Resources

About