This timely book is a welcome addition to the literature on adaptive control systems, an area of research concentration which dates back to about 1958. Dr. Landau has written a book with a strong design viewpoint, and thereby has added greatly to a field of study that has specialized too long on philosophical concepts or special cases. The book presents much material in its 406 pages. Like many research monograms, it was printed from typewritten sheets, not typeset with smooth right margins. The book has the usual number of mistakes such as omitted superscript in equation (2-13), incorrect sign in equation (2.1-23) and omission of reference [11] in list at end of Chapter 4. As a textbook in a graduate course for engineering students, the book will need considerable clarification and amplification, depending of course on the background of the students taking the course. The book is organized into eight chapters and four appendices, namely

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This letter proposes an approximate waterfill power loading scheme using limited feedback in orthogonal frequency division multiplexing (OFDM) systems. The proposed technique achieves nearly the capacity of optimal waterfill power loading, while significantly reducing feedback by using order information for the subcarrier channel gains. Furthermore, the proposed power loading technique can circumvent the practical shortcomings of previous limited feedback power loading techniques by simply exploiting order mapping and interpolation. The advantages are particularly visible at low SNR or for many subcarriers, both of which will be very common in emerging wireless broadband OFDM standards.Index Terms-Channel estimation, feedback compression, order mapping, orthogonal frequency division multiplexing (OFDM).

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