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The Turbo receiver for MIMO channels employs a soft-input, soft-output (SISO) detector followed by a SISO channel decoder. In this letter, we describe and analyze two low complexity SISO detectors named as M-Partial-MAP and LPartial-MAP for LDPC coded MIMO systems. The latter performs slightly better than the former at the price of some computational complexities.
Recent studies have determined the performance of TCH(n,k) (Tomlinson, Cercas, Hughes) codes in different environments, namely for mobile satellite channels for which TCH codes of small length n (e.g. 16) present some advantages when compared with TCH codes of higher length (e.g. 256). However, the correlation characteristics of TCH codes of small length present some peaks that deteriorate its performance...
This paper presents a novel cross-layer decoding method to improve the efficiency of the error protection at the link layer of wireless billboard channels (WBCs) when these are established my means of the digital video broadcast - handheld (DVB-H) carrier technology. Based on the DVB-T standard, the DVB-H itself supports high data rate IP datacasting (IPDC) in dispersive broadcasting channels and...
Tailbiting convolutional codes will be used for several applications in new cellular mobile radio systems. This encoding method does not reset the encoder memory at the end of each data block, avoiding the overhead of the zero tail and improving the efficiency, especially when encoding short data blocks. Nevertheless, the absence of a known tail highly increases the complexity of the decoding process...
This paper presents the study and the realization of a hybrid 60 GHz wireless communications system. As the 60 GHz radio link operates only in a single-room configuration, an additional Radio over Fibre (RoF) link is used to ensure the communications in all the rooms of a residential environment. A single carrier architecture is adopted. The system uses low complexity baseband processing modules....
In this paper, we deal with the design of high-rate space-time block codes (STBCs) that achieve full-diversity with linear receivers which enable symbol-wise decoding. We propose three new high-rate coordinate interleaved STBCs and prove that they can achieve full-diversity with linear receivers for any optimally rotated square QAM constellation. Recently, Shang and Xia proved that the symbol rate...
We propose a forwarding scheme by superposition coding for wireless relaying, in which a relay will not forward a message to a destination if the destination has successfully decoded the message directly from a source. In our scheme, flag signal and data signal are superimposed and transmitted by the source, and according to whether the flag signal has been successfully decoded by the relay, the relay...
We propose a transmission scheme for the receiver cooperative wireless channel with two source-destination pairs, in which the receivers help each other by exchanging information. We decompose the channel into two orthogonal frequency bands. In each band, it reduces to a three-user multiple-access channel (MAC). Based on an encoding scheme for MAC with common information, a decode-and-forward-type...
This paper considers a novel approach to multicarrier orthogonal frequency division multiplexing-based interleave-division multiple-access (OFDM-IDMA) that facilitates both channel estimation and multi-user detection. Specifically, users employ interleavers based upon their channel state information (CSI) to optimize pilot symbol locations, instead of random interleavers as in conventional IDMA. Two...
Compared to conventional network coding, which must combine bit streams after they are decoded, the physical layer network coding (PNC) could make full use of electromagnetic (EM) waves arrived and combine bit stream at the physical layer. Because of this the system throughput could be improved. In this scheme we integrate PNC technique into wireless video transmission based on H.264 for relay channel...
Fountain codes constitute novel erasure codes, which have been standardized for Forward Error Correction (FEC) in broadcast network protocols and by the Third-Generation Partnersonhip Project (3 GPP). The basic operational units of Fountain codes are source packets, which have a particular fixed length. These codes are invoked here in an 802.11 Wireless Local Area Network (WLAN) scenario for protecting...
Traditional Forward Error Correction (FEC) rate allocation schemes, used to enhance the robustness of JPEG 2000 images and video against transmission errors, are based either on Packet oriented Unequal Error Protection or on Layer oriented Unequal Error Protection. As both approaches hold their advantages, unifying them under a new framework becomes a crucial issue. In this paper, we address this...
With rapid advances in multimedia and wireless network technologies, it is now feasible to provide live video streaming over wireless networks. However, since bandwidth is a scarce resource in wireless networks, it is important to design an adaptive bandwidth allocation scheme for video streams to make efficient use of wireless bandwidth. In this paper, we propose an adaptive bandwidth allocation...
Multiple nodes sensing the common target is the most popular application of the Wireless Sensor Networks (WSNs). Pure distributed compression of multiple correlated sources has been discussed much in the related literature, while taking the noisy communication channels into account is more suitable for the actual scenario. In this paper, a practical Distributed Joint Source-Channel Coding (DJSCC)...
Error coding techniques are proposed to enhance the efficiency and reliability, and to minimize the delay of the future Internet. The need of such enhancement is established. Internally, a method is proposed for the replacement of all the Internet transmission protocol Checksums. An optimal coding algorithm is presented for all protocol applications beyond the Internet. Externally, a systematic method...
In order to make multimedia data transmission more robust and meet QoS requirements over wireless channel, Forward Error Correction codes (FEC) are joint with Automatic Repeat-reQuest (ARQ) and a novel Dual-Segment-Check CRC, to form hybrid ARQ (H-ARQ) mechanism, making the system not only have strong error correcting capability and high throughput, but also can adaptively adjust code rate as channel...
In this paper a novel blind adaptive decoding algorithm based on marginalized particle filter (MPF) method is developed for multipleinput multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) communication systems. Blind channel detection requires all the sub-carriers to be considered together for better performance. This results in prohibitive computational requirements in developing...
The advent of the mobile age has heavily changed the requirements of today's communication devices. Data transmission over interference-prone wireless channels requires additional steps of data processing, such as forward error correction, to ensure reliable communication. In this work we present RS(63,55) Reed-Solomon encoding and decoding algorithms according to the IEEE 802.15.4a standard executed...
Wireless communication systems have found their applications in almost every field of life. Most popular of these applications being web browsing, cellular telephony, SMS, MMS and audio & videoconferencing, just to name a few. There are however a few inherent problems in the communication over a wireless channel. The first one is that it is inherently prone to transmission errors and the second...
A novel transmission scheme that mixes half-duplex decode-and-forward cooperative relay transmission (RT) with direct transmission (DT) is proposed for multiple-input multiple-output (MIMO) relay channels. To support limited feedback precoding for DT and RT, a precoder codebook is presented where each codeword can be transformed into a new codeword of different dimension. This allows varying number...
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