Abstract: A method for interference-minimizing code assignment and system parameter selection for code division multiple access (CDMA) networks is disclosed. The method is performed at a base station or mobile station configured to operate in a CDMA radio network. The method includes receiving transmissions from user devices seeking to access the CDMA radio network. A spreading code is selected for a first user device seeking to access the network, using at least one cross-correlation parameter, to reduce multiple access interference between communications involving the first user device and other devices using the CDMA network. The method does not require knowledge of the active user codes or even the codebook from which these codes are assigned. Furthermore, it does not require knowledge of bit or chip epoch or the received powers of active users. However, the method can benefit from such knowledge in several ways, examples of which are disclosed.

Abstract: Apparatus for iterative detection and demodulation of M-ary orthogonal signals (MOK) and signals using Complementary Code Keying (CCK). The apparatus comprises a non-coherent detector that is used during the first iteration and in subsequent iterations uses a coherent detector that is responsive to a soft decoder that is responsive to the detectors. For MOK signals use is made of the first chip, which is known, obviating the need for a pilot signal.

Abstract: A system and method for the iterative detection and demodulation of M-ary orthogonal signals (MOK) and signals modulated using Complementary Code Keying (CCK) is described. An important feature of these methods is the good performance of noncoherent detectors in AWGN channels. However, the performance of these detectors in fast fading channels degrades considerably compared to that of coherent detectors. Iterative detection algorithms that significantly improve the performance of the demodulators with minimal additional complexity are presented The methods use soft decoder output feedback and iterative demodulation and decoding to achieve performance close to that of coherent detection. For MOK, significant performance enhancement is possible even without any loss of throughput due to insertion of pilot symbols. For CCK pilot symbols are necessary but the throughput loss remains low.

Abstract: A system and method for the iterative detection and demodulation of M-ary orthogonal signals (MOK) and signals modulated using Complementary Code Keying (CCK) is described. An important feature of these methods is the good performance of noncoherent detectors in AWGN channels. However, the performance of these detectors in fast fading channels degrades considerably compared to that of coherent detectors. Iterative detection algorithms that significantly improve the performance of the demodulators with minimal additional complexity are presented The methods use soft decoder output feedback and iterative demodulation and decoding to achieve performance close to that of coherent detection. For MOK, significant performance enhancement is possible even without any loss of throughput due to insertion of pilot symbols. For CCK pilot symbols are necessary but the throughput loss remains low.