Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Patent
1997-03-24
2000-10-24
Jung, Min
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
370252, 375208, H04J 1300
Patent
active
061377732
ABSTRACT:
The testing and verification of CDMA cellular base stations requires a number of parameters to be measured. Many of these parameters are measured in the code domain where individual waveforms are extracted from a composite waveform through the use of orthogonal codes. A method and apparatus is described for measuring many code domain parameters using a modified code domain power measurement technique. The apparatus is comprised of a chip timing recovery circuit (46), a reference generator (78), a multiplier (60), various summers and absolute value operations, a memory (76), and a processor (90). In addition, a reference generator (78) for generating an improved reference waveform is described. Reference generator (78) is comprised of a Walsh code generator (200), an I channel PN sequence generator (202), a Q channel PN sequence generator (204), an XOR gate (206), and an XOR gate (208). This improved reference waveform allows for greater code domain parameter measurement accuracy without requiring tighter input frequency tolerances.
REFERENCES:
patent: 5412686 (1995-05-01), Ling
patent: 5577025 (1996-11-01), Skinner et al.
patent: 5712869 (1998-01-01), Lee et al.
R.A. Birgenheier, "Measuring Waveform Quality, Code-domain Power, Time Offsets and Phase Offsets of CDMA Signals", IEEE Conference, Jun. 4, 1996.
An article entitled "Overview of Code-Domain Power, Timing, and Phase Measurements", by Raymond A. Birgenheier from Feb. 1996 Hewlett-Packard Journal, (Feb. 1996).
Smith Lonnie Matthew
Stilwell James Howard
Vitale Thomas Russell
Botsch Bradley J.
Jung Min
LeMoine Dana B.
Motorola Inc.
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