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Wednesday, 24 April 2013

SOLOMEN DECODER FOR ULTRA WIDE BAND FREQUENCIES


       Reed Solomon (RS) codes have been widely used in a variety of communication systems such as space communication link, digital subscriber loops and wireless systems, as well as in networking Communications and magnetic and data storage systems. Continual demand for ever-higher data rates and storage capacity makes it necessary to devise very high-speed implementations of RS Decoders. Newer and faster implementations of the decoder are being developed and implemented. A number of algorithms are available and this often makes it difficult to determine the best choice due to the number of variables and trade-offs available. Therefore, before making a good choice for the application a thorough research is needed into the decoders available. For IEEE 802.15-03 standard proposal (commonly known as UWB) in particular, very high data rates for transmission are needed. According to the current standard, the data rate for UWB will be as high as 480 Mbps. Since the standard is also meant for portable devices, power consumption is of the prime concern, and at the same time the silicon area should be kept as low as possible. As such, a low power and high throughput codec is needed for UWB standard. Reed Solomon is seen as a promising codec for such a standard.

            Reed Solomon(RS) codes have been widely used in a variety of communication systems such as space communication link, digital subscriber loop sand wireless systems, as well as in networking communications and magnetic and data storage systems. Continual demand forever higher data rates and storage capacity makes it necessary to devise very high-speed implementations of RS decoders. Newer and faster implementations of the decoder are being developed and implemented. A number of algorithms are available and this often makes it difficult to determine the best choice due to the number of variables and trade-offs available. Therefore, before making a good choice for the application a thorough research is needed in to the decoders available.
            For IEEE802.15-03 standard proposal (commonly known as UWB) in particular, very high data rates for transmission are needed. According to the current standard, the data rate for UWB will be as high as 480 Mbps. Since the standard is also meant for portable devices, power consumption is of the prime concern, and at the same time the silicon area should be kept as low as possible. As such, a low power and high throughput codec is needed for UWB standard. Reed Solomon is seen as a promising codec for such a standard.
Reed Solomon codes are perhaps the most commonly used in all forms of transmission and data storage for forward error correction(FEC).The basic idea of FEC is to add redundancy at the end of the messages systematically so as to enable the retrieval of messages correctly despite errors in the received sequences. This eliminates he need of retransmission of messages over a noisy channel. RS codes are a subset of Bose-Chaudhuri-Hocquenghem(BCH) codes and are linear block codes is one of the best references for RS Codes.


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