DIFFERENTIAL AMPLITUDE PHASE SHIFT KEYING: A NEW MODULATION METHOD FOR TURBO CODE IN DIGITAL RADIO BROADCASTING

The multilevel modulation techniques nf M-Differential Amplitude Phase Shift Keying (DAPSK) have been proposed in combination with Turbo code scheme for digital radio broadcasting bands below 30 MHz radio channel. Comparison of this modulation method with channel coding in an Additive White Gaussian Noise (AWGN) and multi-path fading channels has been presented. The analysis provides an iterative decoding of the Turbo code.

Modulation for Digital Radio Broadcasting Using Amplitude Autocorrelation of Pseudo Random Noise Codes to Carry Information

The frequency bands used in mobile communications are allocated according to the type of application. With the need for more channels, the frequency spectrum has become a scarce natural resource. This study shows the results of a proposed modulation using a variation of the autocorrelation of pseudo-random codes to carry information. The work also presents the generation of multiple orthogonal axes to increase the bit rate thus improving the channel efficiency.

Digital Radio Broadcasting for Community Radios Using Pseudo-random Codes

This paper aims to present a digital radio broadcasting system that explores the advantages of pseudo-random codes. In this context, a transmitter and its dual receiver are able to reuse frequency spectrum bands without interfering on other existing communication systems. It is proposed a communication system that allows radio broadcasting with the following characteristics: lower transmission power, new communication channels and digital signal processing techinques to add positioning services in two dimensions.

Dependence Theory and Radio： An Evaluation on How Radio Can Change Future Dreams

Radio is all about dreams. This old and tired medium now fights with new media as it is with its old enemy television. Radio has a big impact on dreams. It gives you the sound and makes you dream. Once you get used to this media you start dreaming. If you used to listen radio more, you get in dependence with it. So this day dreaming change to lifeless dreaming. This article gives an evaluation of how radio audience can shape audience future dreams with dependence theory. The paper starts with a conceptual explanation of dependence theory and goes on with a survey done in Turkey to 101 radio listeners. The survey investigates on how people like listening the radio and what makes them enjoy radio. The survey assumes that people listening to radio and getting depended on it start changing the behaviors and habits of listeners. This behavior change effects listeners future dreams and the audience take radio as a model. The paper shows by using the dependence theory that radio listeners take the radio they love as model and use it to build their future business dreams.

Factors Influencing Listening Comprehension of English Radio News Broadcasts

Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students put emphasis on vocabulary and background knowledge and they were aware of the approaches to better listening comprehension and making some practical preparations before doing the listening tasks. However some differences exist between the effective listeners and less-effective listeners,specially regarding to speech rate and out-of-class relevant practice.

Performance enhancement of IEEE 802.11 distributed coordination function for MANET

The medium access control (MAC) issue was discussed in mobile Ad Hoc networks (MANETs). Based on the IEEE 802.11 MAC protocol, this paper proposed two schemes, the forward-packet-first (FPF) scheme based on the adaptive backoff contention window and multihop forward chain transmission by invitation (MFCTI) scheme. In the FPF scheme, the contention window was adjusted adaptively according to the traffic priority. Route information and the broadcast characteristic of radio were utilized in MFCTI scheme. The performance of these schemes was studied in multihop environments by simulations. The results showed that the proposed schemes could improve the network throughput, reduce the end-to-end average delay, and mitigate local congestion effectively. Another attractive feature was that the schemes could be implemented with minor modifications to the IEEE 802.11 MAC.

USING RADIO NEWS BROADCASTS AS LISTENING MATERIAL

INTRODUCTION As English teachers, we have devoted a lot of time to the teaching of listening comprehension using radio broadcasts. We began by using VOA news in special English with freshmen and a mixture of news in special English and standard news broadcasts with sophomores. Later BBC news was used. We accumulated a considerable amount of experience and did some research into the design of listening comprehension exercises. This article discusses how listening ability may be improved by using such broadcasts.

Design and analysis of flexible colorless remote node using RSOA-assisted Michelson interferometer

A scheme of flexible colorless remote note with reflective semiconductor optical amplifier （RSOA） assisted Michelson interferometer is proposed. This is capable of generating an optical carrier suppressed signal at a specific radio frequency to suppress the penalty brought about by Rayleigh backscattering and reflection in a full-duplex single fiber transmission network. Simulations are conducted, and the validation of the proposal is discussed by observing the penalty eye opening factor. The results are useful for designing cost-effective multi-wavelength passive optical network （PON） or radio-over-fiber （RoF） systems.

Gigabit-converged wired and wireless networks for simultaneous multi-services transmission

A novel architecture of converged radio-over-fiber （RoF） and wavelength division multiplexed passive optical network （WDM-PON） system, namely RoF-WDM-PON, is demonstrated. 20-GHz 1-Gb/s radio frequency （RF） signals and 1-Gb/s baseband （BB） signals are simultaneously generated and transmitted using optical carrier suppression （OCS） modulation techniques. The proposed scheme is compatible with the conventional RoF and PON system. 25-km single-mode fiber （SMF） transmission is successfully achieved.