This paper proposes a novel linear estimator named stochastic MV-PURE estimator, developed for the stochastic linear model, and designed to provide improved performance over the linear minimum mean square error (MMSE) Wiener estimator in cases prevailing in practical, real-world settings, where at least some of the second-order statistics of the random vectors under consideration are only imper...

A multiple-input multiple-output (MIMO) communication system combined with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable high data rate transmission over broadband wireless channels. Channel state information for both single-input single-output (SISO) and MIMO systems based on pilot aided arrangement is investigated in this paper. The estimation...

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can replace the conventional rake combining while offering significantly improved bit error rate (BER) performance for the downlink DS-CDMA in a frequency-selective fading channel. However, the presence of residual inter-chip-inference (ICI) after FDE produces orthogonality distortion among the spreading...

In this paper, we propose a robust adaptive minimum mean square error (MMSE) Rake receiver for asynchronous DS-CDMA systems. The receiver uses the modified MMSE criterion that incorporates the differential detection and the amplitude compensation for interference cancellation in a time-varying multipath fading channel. We investigate that the proposed Rake receiver can achieve the higher output...

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using ...

あらまし 次世代移動無線通信システムで要求される数ギガビット毎秒のデータ通信の実現には厳しい周波数選 択性チャネルの克服が必須である.周波数領域拡散を用いるマルチキャリア(MC)符号分割多元接続(CDMA)伝送で は,最小平均二乗誤差(MMSE)規範に基づく 1 タップの周波数領域受信等化(受信 MMSE-FDE)を用いることで優れ た伝送特性を実現できることが知られている.ところで,送信機がチャネル情報を有しているときには,MMSE規 範に基づく 1タップの周波数領域送信等化(送信MMSE-FDE)が適用可能であることが示されている.筆者らは,チ ャネル情報を送受信機が共有している場合に送受信機でそれぞれ 1 タップの FDE を行うジョイント送信/受信 MMSE-FDEを提案してきた.本稿ではMC-CDMA伝送を対象に,これら 3種のMMSE-FDEの比較と考察を行う. それぞれ...

MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing) is an excellent technique used in modern wireless communication systems. It has excellent quality of high speed data/voice transmission with high spectral efficiency. The Least Square (LS) and Minimum Mean Square Error (MMSE) channel estimation are the most common methods presented by several researchers. Disc...

Abstract In the next generation wireless communication systems, high-speed packet services will be in great demand, and hence error control technique is indispensable. Hybrid automatic repeat request (HARQ) is a well-known important error controlling technique. Joint FDE and inter-chip interference (ICI) cancellation based on the minimum mean square error (MMSE) criterion can achieve frequency ...

The most important aspect of any classifier is its error rate, because this quantifies its predictive capacity. Thus, the accuracy of error estimation is critical. Error estimation is problematic in small-sample classifier design because the error must be estimated using the same data from which the classifier has been designed. Use of prior knowledge, in the form of a prior distribution on an ...