Short code detection method
AssigneeInterDigital Technology Corporation
InventorsFatih M. Ozluturk, Alexander M. Jacques
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Abstract
A method is disclosed for receiving a transmitted signal in a communication system employing CDMA techniques wherein the transmitted signal includes a plurality of short codes, each of which is transmitted repetitively over a fixed period of time and where the received signal has CW interference in addition to the transmitted signal. The method includes detecting the presence of the short code in a plurality of time phases of the received signal by calculating a likelihood ratio for each phase. The likelihood ratio takes into account the current short code.
Claims18
A method for receiving a transmitted signal which includes at least one short code which is periodically updated;
- the method comprising:
- receiving and despreading said transmitted signal to output a despread signal;
- obtaining a background noise estimate using said at least one periodically updated short code;
- calculating a value, based upon said background noise estimate, representing the likelihood that a short code has been detected;
- comparing said value with a predetermined threshold;
- and
- confirming the detection of said short code if said value exceeds said predetermined threshold.
A method for receiving a signal having at least one short code which is periodically updated, the method comprising:
- receiving said signal;
- obtaining a background noise estimate using said periodically updated short code;
- utilizing said background noise estimate to adjust a likelihood ratio in accordance with the transmitted signal;
- and
- comparing said likelihood ratio with a predetermined threshold to determine whether said likelihood ratio exceeds said predetermined threshold to indicate the detection of said short code in said received signal.
Dependencies are inferred from the claim text.