The SINR performance of cascaded adaptive arrays
Abstract
The LMS adaptive array is useful for desired signal tracking and suppression of interference. However, excessive signal levels at the inputs may cause the array to respond too fast, resulting in degraded array performance. To overcome this problem, cascades of adaptive arrays are being investigated where each LMS input is preceeded by a power inversion (PI) array. It is shown that with proper choice of the PI steering vectors the output of a 'fully implemented' cascade has the same output as a solitary LMS array and hence maximal output SINR. A 'fully implemented' cascade has N elements, N N-input PI arrays, and one N input LMS processor. Methods of 'thinning' a cascaded array (removing control loops to reduce cost and complexity) are also discussed.
- Publication:
-
ICC 1982 - The Digital Revolution, Volume 2
- Pub Date:
- 1982
- Bibcode:
- 1982icc.....2....4E
- Keywords:
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- Adaptive Control;
- Antenna Arrays;
- Cascade Control;
- Signal To Noise Ratios;
- Costs;
- Least Squares Method;
- Loops;
- Matrices (Mathematics);
- Communications and Radar