Reconfigurable OFDM Receiver for Next Generation Wireless Mesh
Performance of current mesh networks suffer due to the lack of an intelligent physical layer. Research and development in higher layer protocols alone cannot reduce the latency and performance of next generation wireless networks. If such a physical layer was designed so that it minimizes the involvement of higher layer protocols when it comes to routing, then latency in wireless networks can be reduced significantly. The transceiver for such a physical layer should have the ability to selectively switch the incoming packets "on-the-fly" to a different part of the spectrum so that a full-duplex transmit-receive chain is possible. This is also facilitated by the use of orthogonal modulation techniques either using orthogonal codes (OCDM) or orthogonal frequencies (OFDM) for transmission. An intelligent PHY like the one mentioned above will also play an integral part when it comes to cooperative transport of packets using MIMO systems and exploiting the spatial diversity of multiple antenna systems.
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OFDM Receiver Physical Layer Router
Performace Evaluation and Analysis
ˆX(k 64 samples algorithms autocorrelation baseband BPSK buﬀering Carrier Frequency Oﬀset channel estimates Chapter clock comb type constellation control signal Convolution Codes correlation energy cyclic preﬁx data rate data subcarriers de-interleaver De-scrambler Decision Boundaries decode the information deﬁned demodulator Detector diﬀerent subchannels eﬀect encoding estimate the channel FFT block FFT engine Figure ﬁlters ﬁrst ﬂy FPGA Frequency Agile Receiver Frequency Domain Switch front-end hardware Utilization higher layer incoming signal information bits input interleaver ISM band latched latency linear interpolation long preamble Maximum Likelihood mesh network multicarrier communication multiple NBPSC NCBPS Node number of pilots OFDM receiver OFDM symbol orthogonal output packet detection phase physical layer Pilot Arrangement pilot subcarriers platform Puncturing and De-puncturing QPSK radio receiver pipeline reconﬁgurable Relaying using OFDMA sample long scrambler short preamble symbols shown in ﬁg shows speciﬁcation TDMA transceiver users Viterbi Decoder Wireless Mesh wireless mesh network wireless networks Xilinx XNOR