The two-way amplify-and-forward (AF) relaying network consisting of 2M sources with only a single antenna per source and one relay with multiple N antennas at the 2M destinations is investigated in this paper. All sources act as both sources and destinations with a self-interference cancelation process at the 2M destinations. The closed form of the relay amplifying matrix is optimized under the...

Signal to Noise Ratio (SNR) estimation of a received signal is an important and essential information for Orthogonal Frequency Division Multiplexing (OFDM) system. This is because in OFDM system, robustness in frequency selective channels can be achieved using adaptable transmission parameters. Therefore, to reckon these parameters, knowledge of SNR estimates obtained by channel state informati...

We systematically analyze the biased and unbiased minimum mean square error (MMSE) equalizers of finite as well as infinite length, with and without decision feedback sections. New closed-form expressions of optimum equalizer weights, the MMSE, and symbol error probabilities (SEP), solely in terms of channel response parameters and noise power, are derived for the above receivers. These new exp...

This paper proposes a minimummean-square-error bi-directional amplify-and-forward (MMSEBAF) relaying protocol for multi-hop wireless networks employing multi-antenna relays. MMSEBAF is a two-phase relaying protocol which allows for two sources to exchange independent messages via a relay node equiped with multiple antennas. The latter performs a joint linear MMSE filtering of the received signa...

Periodogram is a simple and eecient way to detect and estimate parameters of sinusoidal signals. In this paper, we attempt to determine the optimum periodogram implementation for a single real tone detection in the presence of white Gaussian noise, among its variants such as the Bartlett's procedure and Welch method. The possibility of delaying threshold eeect using diierent realiza-tions for f...

In a frequency-selective fading channel, the transmission performance of single-carrier (SC) transmission significantly degrades due to severe inter-symbol-interference (ISI). In this paper, the joint use of space-time transmit diversity (STTD), receive antenna diversity and frequency-domain minimum mean square error (MMSE) equalization in SC transmission is studied. Space-time encoding and dec...

Non-orthogonal multiple access (NOMA) is suggested as a radio access candidate for future wireless mobile networks. It utilizes the power domain for user multiplexing on the transmitter side and adopts a successive interference cancellation (SIC) as the baseline receiver scheme, considering the expected mobile device evolution in the near future. However, recent research focuses more on the per...

Synchronous CDMA systems whose transmission bandwidth is quantified through the fractional out-of-band energy (FOBE) constraint are considered. Either a conventional matched filter (MF) receiver or a minimum mean-square error (MMSE) receiver is employed for users’ data detection. The total squared correlation (TSC) and the total mean-square error (TMSE) are proposed as the performance parameter...

Abstract In direct sequence code division multiple access (DS-CDMA), frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and achieve a much improved bit error rate (BER) performance compared with the conventional rake combining. However, DS-CDMA with MMSE-FDE requires the insertion of guard interval ...

Frequency-domain equalization (FDE) based on minimum mean square error (MMSE) is considered as a promising equalization technique for a broadband single-carrier (SC) transmission. When a square-root Nyquist filter is used at a transmitter and receiver to limit the signal bandwidth, the presence of timing offset produces the inter-symbol interference (ISI) and degrades the bit error rate (BER) p...