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SYMPCHUNK sets the number of symbols demodulated at once with a constant carrier frequency and symbol timing offset. This is a fundamental decoder parameter that establishes its carrier and symbol timing tracking bandwidth. Set it too low and the demodulator can"t accurately determine carrier frequency and symbol timing on a noisy signal. Set it too high and the demodulator may not be able to track large symbol rate offsets caused by Doppler shift and/or A/D or spacecraft clock errors. Or it might have trouble tracking high rates of change in the carrier frequency due to Doppler acceleration.The current value of SYMPCHUNK is 4*N1 = 512, where N1 = 128 is the order of the convolutional interleaver. 512 symbols is 512 milliseconds at 1000 symbols/sec, giving a frequency/time determination SNR that is 10*log10(512) = 27 dB greater than the Es/N0, not counti

about cognitive radio in wireless communication

#include "config.h" INT8U RBUF; INT8U TDAT,RDAT; INT8U TCNT,RCNT; INT8U TBIT,RBIT; BOOLEAN TING,RING; BOOLEAN TEND,REND; INT8U uc_rxdIndex,uc_rxdDealIndex; INT8U uc_uartBuf[UART_BUF_LEN]; INT8U uc_uartRecFifoLen; /* 接收FIFO中的数目 */ BOOLEAN b_uartRecFifoFlag; INT16U us_allSendCnt; INT8U uc_sendCnt; //INT8U * pSendBuf; INT8U * p_pSendBuf[P_SEND_BUF_LEN]; /* 要发送的数据的指针 */ INT8U uc_pSendBufLen[P_SEND_BUF_LEN]; /* 每个指针包含的数据长度 */ INT8U uc_pSendBufIndex; INT8U uc_pSendBufDealIndex;

微软亚洲研究院论文：有线无线网络视频组播中差错保护的最优分配-Microsoft Asia Research Institute Papers : wired and wireless networks Multicast Video Error protection optimal allocation

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