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In multi-code transmission system, the amplitude of the transmission signal may have sharp fluctuations, and non-linear distortion occurs in the transmission signal. To solve this problem, the authors propose two novel multi-code transmission systems with constant amplitude signaling in this paper. They compare the proposed systems with Multi-Code transmission with Constant Amplitude signaling (MC-CA)...
In multi-carrier transmission systems, MC-CDMA and MC-DS-CDMA have been proposed. However, when large delay spread is longer than guard interval (GI), the inter symbol interference (ISI) and inter carrier interference (ICI) are occurred. Their interferences cause the system performance deterioration. This paper treats MC-CDMA and MC-DS-CDMA with four kinds of orthogonal spreading sequence including...
Information hiding schemes using complete complementary codes (CCCs) have been developed for image data. It has been shown that a high payload and a low bit-error-rate (BER) can be achieved by such data hiding strategies because of the ideal correlation properties of CCCs. In this work, we apply a data hiding scheme based on CCCs to audio signals. Properties such as signal-to-noise ratio (SNR) and...
Cooperative communication can yield spatial diversity gains, but its performance can also suffer severely from the multiple carrier frequency offsets (MCFOs) induced by high-speed relative motion, in addition to Doppler spread. In orthogonal frequency-division multiplexing (OFDM) systems, such performance degradation arises as a result of intercarrier interference (ICI). We have shown previously that,...
We propose a novel joint decoding technique for distributed source-channel (DSC) coded systems for transmission of correlated binary Markov sources over additive white Gaussian noise (AWGN) channels. In the proposed scheme, relatively short-length, low-density parity-check (LDPC) codes are independently used to encode the bit sequences of each source. To reconstruct the original bit sequence, a joint...
In this paper, the generating principle of m sub-sequence is introduced and analyzed. On this basis, a multi-user direct sequence spread spectrum(DSSS) communication system is constructed and simulated in Matlab. Simulation results show that the bit error rate(BER) of DSSS communication using m sub-sequences as spreading codes is not inferior to the system using m sequences and gold sequences. It...
We consider a multi-user multiple-input multiple-output (MIMO) system using block diagonalization and eigenbeam-space division multiplexing to suppress inter-user interference and inter-stream interference. In time-varying environments, the performance seriously degrades due to mistracking of beamforming. A channel prediction scheme can eliminate the effect of the time-varying environments. In this...
This paper presents the performance study of new binary spreading codes over Rayleigh fading channel. The proposed codes are constructed using Gray and Inverse Gray codes. Like Walsh code, these codes are available in sizes of power of two and additionally code sets of length 6 and their even multiples are also available. The simple construction technique and availability of code sets of different...
Code division multiple access (CDMA) is one of the promising medium access control (MAC) schemes for underwater acoustic sensor networks because of its robustness against frequency-selective fading and high frequency-reuse efficiency. In this study, we design the forward and reverse links of a CDMA transceiver so that it can be operated in underwater acoustic channel environments, and we evaluate...
Owing to ideal correlation properties of complementary codes (CCs), a complementary coded code division multiple access (CC-CDMA) system outperforms traditional CDMA systems in terms of its interference resistance in both synchronous and asynchronous transmissions. This paper shows that a normal CC-CDMA system loses its interference-free feature over uplink frequency selective fading channels due...
Extended Symbol OFDM (ES-OFDM) is applied in case of a multiple antenna receiver. The receiver architecture is based on the observation that OFDM constellation points can be determined by means of correlation. Summing correlations between multiple antennas leads to an interferometer receiver. This approach gives the freedom to choose which correlations are summed. Three antenna structures are explored:...
The enormous growth of consumer electronic industry is driving the need for achieving ultra-high areal storage densities. Shingled magnetic recording (SMR) is a promising high density storage technique where shingles are created by overlapping tracks for increasing the track per inch (TPI) and achieving higher areal densities. High TPI values, however, introduce sidetrack interference in the equalized...
For Multiple-Input Multiple-Output (MIMO) systems with frequency selective fading channels, Bit-Interleaved Coded Multiple Beamforming (BICMB) with Orthogonal Frequency Division Multiplexing (OFDM) can be employed to offer both spatial and multipath diversity, making it an important technique. Nevertheless, analyzing its diversity is a challenging problem. In this paper, the diversity analysis of...
In this paper we present an extension of our previous investigation [1] of the effect of environmental temperature variation on the bit error rate (BER) performance of multiwavelength 2- dimensional wavelength hopping time spreading optical code division multiple access (2D-WH/TS OCDMA) signals that utilises picosecond pulses for code formation. Using equations already derived in [1] for modelling...
This paper introduces a class of perfect binary sequence pair (PBSP), which is characterized by the impulse-equivalent periodic autocorrelation function (PACF) and the length of N=2k. The proposed PBSP can be generated from a class of difference set pairs (DSP). Considering the desirable properties of the proposed sequence pair, orthogonal frequency division multiplexing (OFDM) transmission with time-domain...
Bit Error Rate (BER) is a key parameter used to evaluate the performance of radio communication systems. In this paper, a realistic BER of radio MRC diversity systems is predicted based on the Multi-Resolution Frequency Domain ParFlow (MR-FDPF) model. The prediction takes into account the correlations among diversity branches and makes no assumptions of the correlation model. The predicted realistic...
Analytical methods of signal recovery that are not limited to specific channel conditions are of great importance for an amplify and forward (AF) relay network, as the performance of diversity systems operating over such conditions are affected by various channel characteristics. Signal extraction from a correlated noise environment remains as another crucial issue that requires exploration. A block...
Impulse Radio Ultra Wide Band (IR-UWB) is the most promising communication technology for low power, short distance, high data rate applications. IR-UWB spectrum being coincided with other narrow band communication systems transmitting high powers is prone to narrow band interference (NBI). In this paper, we have used Gabor Transform to approximate template at receiver with subcarriers. In the present...
As there are demands for OFDM transmission at 60GHz band, researchers need to deal with the problem of frequency offset and phase noise, especially at the high frequency band. This paper builds a theoretical framework for analyzing the Inter-Carrier-Interference (ICI) incurred due to phase noise and frequency offset of in OFDM transmission system. Based on the model, ICI dependent error floors of...
We study ultra wideband (UWB) communications over dense multipath channels with M-ary frequency shift keying (FSK) data modulation and low complexity receivers. We model the signal transmission-reception taking into account the effects of both the frequency response of the antenna system and the frequency selectivity of the multipath channel. We derive an expression for the bit error rate (BER) when...
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