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This paper investigates a typical optimization problem for 60 GHz multiuser hybrid beamforming, which is to maximize the minimal SINR over all of the considered subcarriers under a total power constraint. In order to reduce the complexity, two methods of using the fixed analog beamforming (ABF) weights are presented rather than traditional iterative methods, which are codebook-based method and singular...
It is widely accepted that the emergence of cognitive radio (CR) will lead to a wireless communication revolution. Spectrum sensing is one key process of CR, which makes effective use of scarce spectrum. Two novel schemes, clustering and locating schemes, are presented for spectrum sensing based on energy detection on the condition that there are multiple primary users in the cognitive radio network...
A novel spatial-multiplexing orthogonal frequency- division multiplexing (OFDM) transmission system with transmit diversity provided by space-frequency block code (SFBC) is proposed in this paper. The proposed scheme combines Alamouti scheme and Bell Labs layered space-time (BLAST) together, thus can achieve transmit diversity and spatial multiplexing gains altogether. Two-step iterative detection...
In this paper, we analysis the receiver of orthogonal frequency division multiplexing (OFDM) systems over frequency selective fading channels where the multipath delay exceeds the guard interval duration and propose a novel receiver scheme. The proposed receiver consists of the Inter Symbol Interference (ISI) canceller and the turbo equalizer. At each iteration, the proposed turbo equalization algorithm...
This paper proposes an efficient turbo equalization for multiple-input multiple-output (MIMO) single carrier systems with cyclic-prefix (CP). The receiver can effectively conduct inter-symbol interference cancellation (ISIC) and inter-antenna interference cancellation (IAIC) followed by frequency domain equalization (FDE), and the elements of the estimated symbol sequence are demapped onto the bit...
A Code Division Multiple Access (CDMA) downlink receiver based on Adaptive Overlap-Cut (AOC) Method Frequency Domain Equalization (FDE) and non-linear feedback Parallel Interference Cancellation (PIC) is proposed. Firstly, the analysis for the generation and the distribution of the inherent error of Overlap-Cut (OC) Method FDE carries out the improved version of it called AOC Method FDE. Secondly,...
In this paper, two iterative algorithms for NDA (nondata_aided) channel estimation are introduced to the DSJJWB system. The two iterative algorithms are named MMSE (minimum-mean-square-error) iterative algorithm and NMMSE(nonminimum-mean-square-error) iterative algorithm. The BER performances of the MRC Rake receiver with the two iterative algorithms are verified and compared via simulations. The...
In the V-BLAST OFDM system, if bits and power are allocated among all subchannels on average, the bad subchannels will deteriorate system performance largely. Based on this, adaptive V-BLAST OFDM system is proposed. And the water filling algorithm based on bisection iteration method is introduced. Simulation results show the proposed system satisfies the target BER and it outperforms the traditional...
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