Abstract

This paper proposes an efficient implementation of digital up and down conversion for Software Defined Radio (SDR) using Model-Based Design (MBD). In particular, a novel flow for designing digital up and down conversion is detailed. Using MBD, a system model is at the center of the development process, from requirement development, through design, implementation, and testing. Using MBD, code can be automatically generated for system and create test benches for system verification, which is saving time and avoiding the introduction of manually coded errors. Design example shows that the proposed method can greatly reduce the complexity of digital up and down conversion while providing the efficient and reliability of design flow.

AbsIraeGIn this paper we forvs our research on the coane symbol timing synchronization technique in Wireless Local Area Network (WLAN)[l] COFDM systems. An analysis is made on the diUerence between the symbol timing synchronization technique in continuous mode transmission systems such as DVB-T[Z] and the burst mode transmission systems such as WLAN. A new method to do cname symbol timing in time domain is proposed. Simulations show that it has distinct advantage over the conventiawl Maximum Likelihood (ML) method under multi-path wireless channel conditions. The cnrresponding Field Programmable Gate Array circuit through test in HDTV pmtdype in Team of Engineering Experl Group W E G ) proves that the new method is not only suitable for bunt mode but also suitahle fm continuous mode transmission systems. I.

This paper makes a research on the fundamental principle of digital modulation and frequency conversion in broad band digital broadcasting terrestrial TV ( BDB-T ) system. Different from conventional down-conversion technique, this paper proposes a new digital down-conversion model utilizing Hilbert transform and a method eliminating the A/D DC offset in this model is also proposed. The correspondent FPGA hardware though testing process in HDTV prototype proves the efficiency and good performance of the model and the new method.

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