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Statistics obtained during demodulation are used in a direct-sequence spread-spectrum packet radio network to govern the adjustment of transmitter power within the first few packets of a session. The statistics are also employed by an adaptive transmission protocol to select the modulation parameters and the rate of the error-control code for each packet. The power-adjustment protocol uses the statistics...
For a frequency-hop (FH) spread-spectrum communication system, the packet error rate is dependent on both the performance of the error-correcting code and the ability of the receiver to detect and acquire timing of incoming packets. It is important that the error rate for one does not limit the overall error rate of the system. Turbo coding has been shown to be robust in the presence of partial-band...
While two-dimensional (2-D) orthogonal variable spreading factor (OVSF) codes were proposed for multicarrier direct-sequence code-division multiple-access (MC/DS-CDMA) systems in order to eliminate multiple-access interference, the number of orthogonal sequences (or code cardinality) was restricted by the number of carrier frequencies. Non-orthogonal 2-D frequency-time-spreading (FTS) codes were then...
In this paper, we propose an effective error and erasure decoding scheme with multi-level erasure-decision threshold for Reed-Solomon (RS) codes in frequency-hopped multiple-access communications with MFSK signaling, and analyze its performance. RS coding is used to correct erasures and errors caused by other-user interference and thermal noise. The proposed decoder decides whether to erase the received...
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