The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Achievable information rates (AIRs) are calculated for optical fiber systems employing soft-decision and hard-decision nonbinary codes. We show that, despite the lower decoding complexity, hard-decision AIRs approach soft-decision AIRs for high spectral efficiencies and long transmission distances.
Existing finite field network coding (FFNC) can be applied in networks where all users have the same data rate and can thus use the same modulation type. In most practical scenarios, different users typically have different data rates. With simple changes such as zero-padding and repetition to the data sequences of different users received at relays, it is still possible to employ the existing FFNC...
In this paper we consider a novel design of space-time block code combined with pre-coding module transmission system. Theory of orthogonal designs has shown that such code cannot be simultaneously orthogonal, of rate 1, with full diversity order, for more than 2 transmit antennas. We propose in this paper a new way to overcome this limitation by adding a pre-coding module before transmitting space-time...
An efficient modulation and coding scheme combined with multiple LDPC codes and PPM modulation is proposed to mitigate the effect of atmospheric turbulence, which can have an unfavorable impact on the reliability of the communication link in the laser channel of the integration network of satellite and ground. The research is mainly about the reliability of the communication link under different orders...
This paper investigates a new methodology for soft information forwarding (SIF) based on a novel technique known as soft angular modulation (SAM). In this new relay scheme, the soft symbols are embedded into phases at the relay. This is more advantageous as we refrain to forward real values (under bandwidth constraints) via wireless channels. This makes the proposed scheme practically feasible. The...
This paper presented a multi-rate Star-QAM encoding and decoding method based on the hierarchical coding which could be adjusted to achieve the channel coding efficiency and modulation. The design is based on the combination of soft / hard decision in layered decoding. We have successfully increased BER performance to 0.5dB which achieved 10−5 when SNR is 11 compared to no stratification codec considering...
By exploiting temporal-to-spatial domain mapping, we report high-speed spatial light modulation based on conventional spatial light modulators with slow response time. We demonstrate 25-Gbit/s twisted light (orbital angular momentum) encoding/decoding and 260-m security free-space data transmission in the experiment.
Expectations and requirements for wireless communication systems continue to grow rapidly. Reliability is one of the most challenging criterions. Soft combined turbo codes technique aims to improve the error correction capability of turbo codes by using soft combining principle, at bit level, inside the turbo decoder. In particular, this approach is based on weight factors which are key elements that...
It is well known that level shifted phase disposition pulse width modulation (PD-PWM) achieves the best possible three-phase line-to-line output voltage spectrum for multilevel converters. However the strategy does require post modulation signal decoding to optimally select between redundant switched states and to achieve an even distribution of commutation events across all switching devices. For...
Document is unavailable: This DOI was registered to an article that was not presented by the author(s) at this conference. As per section 8.2.1.B.13 of IEEE's "Publication Services and Products Board Operations Manual," IEEE has chosen to exclude this article from distribution. We regret any inconvenience.
We proposed a nonbinary byte-interleaved coded-modulation scheme with inner and outer turbo-like iterative decoder. The net coding gain is 0.6dB higher than the state-of-the-art binary SPC-LDPC-based turbo-product counterpart, with adjustable iterations and lower error-floor.
We experimentally study different four-dimensional demappers in a dispersion-managed fiber system. The proposed blind algorithm is shown to offer gains of 0.2 bits per 4D symbol for DP-16QAM.
We experimentally demonstrate 56-Gbit/s 4-D PAM-4 TCM transmission over 40 km SMF without optical amplifiers. Results show that TCM PAM-4 outperforms the uncoded PAM-4 by more than 2.5 dB at a BER equal to 10−6.
An LDPC-coded BICM-ID scheme with nonuniform signaling (NS) for 9-QAM and 12-QAM is proposed, which is designed by mapping Huffman code onto constellations. We demonstrate that proposed NS scheme outperforms LDPC-coded 8-QAM by 0.8 dB.
This paper presents our research in developing high performance but low complexity MIMO decoders for the newest WLAN, i.e. 802.11ac. K-best and Trellis methods are proposed to develop the MIMO decoders. Their performances are observed and compared to MIMO decoders which are based on linear and optimal methods, i.e. ZF, MMSE, and ML. Run test of 2×2 MEMO, 64-QAM, Coding rate 3/4, and 40MHz of bandwidth...
This paper proposes a 2-Phase Shift Keying (2-PSK) based modulation scheme for Image Sensor Communications. The considered communication system on a car uses a couple of LED light sources for transmitting data (either two rear light sources or two front light sources) and a typical-frame-rate camera (i.e. 30fps frame rate) which is either a global shutter camera or a rolling shutter camera for receiving...
We study the impact of demappers using various channel statistics, including circularly symmetric and multi-dimensional Gaussian, in fiber-optic communication systems. In nonlinear dispersion-managed fiber systems, an improvement in achievable information rate (AIR) and bit error ratio (BER) after decoding is obtained from using multi-dimensional non-circularly symmetric Gaussian statistics at the...
Polar codes are known as the first provable code construction to achieve Shannon capacity for arbitrary symmetric binary input channels. Several schemes to provides both detection/decoding of the transmitted and the transmit antenna index in Multiple-Input Multiple-Output (MIMO) antenna systems were proposed in the literature for polar codes. In this paper we have critically analyzed various MIMO...
Time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) is widely recognized as an orthogonal frequency division multiplexing (OFDM) transmission scheme with high spectral effciency. However, it suffers from severe performance loss over strong frequency selective channels, thus has difficulty supporting high-order modulations such as 256 QAM. To improve the channel estimation...
Successive relaying (SR) provides an effective transmission scheme to recover the multiplexing loss of the traditional cooperative networks. However, SR suffers from the inter-relay interference (IRI) problem, which results in transmission error and degrades the system throughput. In order to achieve full-diversity, interference cancellation (IC) is introduced to the reception at relay nodes. To completely...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.