Multirate CDMA signals with controlled peak-to-average power ratio: Construction and performance analysis

Advanced mobile communications systems include provisions for multirate communications. Multirate communications can be achieved in several ways. This dissertation examines construction and error rate performance of parallel channel multirate direct sequence code-division multiple-access (DS-CDMA) communications.; Extension of battery life in the mobile handset is of particular importance. One means of extending battery life is to use signals whose peak-to-average power (PAV) ratio is minimized. This dissertation proposes a technique of constructing multirate CDMA signals by using balanced incomplete block designs (BIBD) to select spreading codes from a pool of codes so as to control the PAV ratio of the resultant signals and to utilize the code pool effectively.; Included in the dissertation are details of a union bounding technique, which is not a Gaussian approximation, for analyzing the error performance of the proposed signal construction scheme in an environment with asynchronous multiple-access interference in both a nonfading and a Rayleigh-fading channel. The analysis technique has wide appeal because, in addition to analyzing performance of the proposed signal construction technique, it also applies to a broad range of signaling schemes that use static and deterministic multirate data symbols. The analysis technique assumes use of a correlation receiver.; Conclusions drawn are as follows. The proposed signal construction scheme effectively controls the PAV ratio while providing acceptable error performance in the nonfading channel with multiple-access interference present. Further research needs to be performed to enable construction of signals that support higher rate multipliers. The analysis technique is accurate and effective for analyzing the performance of a broad range of signaling schemes in a nonfading channel and an environment with multiple-access interference, but the union bounding yields results for the fading channel that are less accurate than desired.