专利名称：Digital communications system having an
automatically selectable transmission rate
发明人：Rob Marchetto,Claudio Rey申请号：US08/743983申请日：19961031公开号：US05914959A公开日：19990622
摘要：A system and method for maintaining communication between a paging basestation (transceiver) and a mobile paging unit when signal reception is below a level thatwould otherwise be unacceptable. The system changes from one data transmission rateto another depending upon the quality of the communication channel. In particular, thesymbol rate of the transmissions remains the same, but the number of modulation statesand bits per symbol is decreased or increased depending upon the bit error rate of thereceived signal. In some arrangements, the transceiver transmits at the highest bit ratefor that particular system. If no response is received from the paging unit or the pagingunit sends a response signal back to the transceiver indicating the signal sent is
unacceptable, the transceiver retransmits at a lower bit rate. In other arrangements, thereceiver determines the highest data rate within the group of data rates available andtransmits a signal representative of that data rate to the base station. In response tosuch a signal, the base station transmits at the requested data rate until a different datarate is requested.
申请人：GLENAYRE ELECTRONICS, INC.
代理机构：Christensen O'Connor Johnson & Kindness PLLC
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