发明名称 |
PASSBAND DQPSK DETECTOR FOR A DIGITAL COMMUNICATIONS RECEIVER |
摘要 |
A digital communications DQPSK passband detector having a matched filter, a differential decoder, and a slicer that use elementary circuit components. In the matched filter, recovered carrier references signals are fed along with the received signal to a pair of XNOR gates. This arrangement effectively results in a multiplication operation without any complex circuit elements. The outputs of the XNOR gates control the direction of counting of a pair of binary counters that generate correlated values of the I and Q components in the received signal. Thus, the integrate/dump circuits of a conventional matched filter are replaced with simpler digital counters. A digital differential decoder to extract the phase difference information between two consecutive received symbols is built from a network of delay elements, multipliers, and adders to recover the phase data. The digital differential decoder produces a digital complex-signal output that can be quantized in a digital slicer to decode the plurality of binary bits transmitted through the data symbols. All these operations are performed on digital signals with basic digital circuit elements, thus resulting in a repeatable robust receiver design without complex hardware components.
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申请公布号 |
WO9823070(A1) |
申请公布日期 |
1998.05.28 |
申请号 |
WO1997US21468 |
申请日期 |
1997.11.21 |
申请人 |
ADVANCED MICRO DEVICES, INC. |
发明人 |
HENDRICKSON, ALAN;SCHNIZLEIN, PAUL |
分类号 |
G06F11/00;H03L7/093;H03L7/099;H03L7/107;H03L7/14;H03M13/00;H04B1/707;H04L1/24;H04L7/033;H04L27/00;H04L27/22;H04L27/227;(IPC1-7):H04L27/227 |
主分类号 |
G06F11/00 |
代理机构 |
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