Linear frequency coded sequences (L.F.C.S.)

CorrespondenceLinear frequency coded sequences (l.f.c.s.)

In the early 1970s, I was employed at LoughboroughUniversity where, among other things, I was involved inresearch on phase coded pulse train signals, suitablefor pulse compression systems. Part of this work wasdone with the help of Mr. C.N. Oligboh, who was employedat Loughborough University as a Research Assistant,working under my supervision.

I was sorry to see that the August 1980 issue containeda paperA, under the above title, on the work done atLoughborough, which Mr. Oligboh had prepared and sub-mitted under his name and mine, entirely without myknowledge and consent. Had I been asked, I would havebeen pleased to participate in the preparation of a paper.As it is, the published paper contains a number of errors.Even the affiliation is wrong; I left Loughborough Uni-versity in 1973 and Mr. Oligboh left there soon after.

9th October 1980 MARTIN H. ACKROYD

Department of Electrical & Electronic EngineeringUniversity of AstonGosta GreenBirminghamEngland

Reference

A OLIGBOH, C.N., and ACKROYD, M.H.: 'Linear frequencycoded sequences (l.f.c.s.)', IEE Proc. G, Electron. Circuits &Syst., 1980, 127, (4), pp. 191-198

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ErratumMENGALI, U., and PIRANI, G.: 'Timing-jitter growth in achain of regenerative repeaters for optical-fibre trans-missions', IEE Proc. G, Electron. Grcuits & Syst., 1980,127, (3), pp. 153-162:

Reference to the authors should read Prof. U. Mengali,Mem. I.E.E.E. and G. Pirani, Mem. I.E.E.E.

Section 1, paragraph 5, line 18; unuseful should readuselessSection 2, paragraph 1, line 5 ; / should read ISection 2c, line 3; in (a) should read in eqn. 1

Section 3, paragraph 1, line 4; simple should read sample

In eqn. 17, the square brackets should be replaced byvertical lines to indicate the modulus of the enclosedexpression

In the equation between eqns. 24 and 25, cos/x should bedeleted from the numerator

Section 11.2, heading; 29 should read 45

Section 11.3, heading, Worked example should readEquations 47 and 48

In the caption to Fig. 7, vacancies should read variances

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IEE PROC, Vol. 127, No. 6, Pt. G, DECEMBER 1980 331

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