On the design of multiple antenna systems with continuous phase modulation

Continuous phase modulation (CPM) has been an attractive modulation scheme for digital transmission over both power- and bandwidth-limited channels such as in mobile satellite communications.; Space-time coding can take advantage of the space diversity introduced by multiple transmit antennas in addition to the time diversity. Combined with CPM (ST-CPM), it can achieve better bandwidth and power efficiency.; One of the challenges in space-time code design with CPM is to guarantee full spatial diversity due to both the nonlinearity of the modulation and the more complex resulting performance metrics. We developed some systematic design theorems to ensure full diversity with certain CPM schemes in quasi-static fading based on the linear decomposition and binary rank criteria available in linear modulation.; However, most space-time codes are constructed under the assumption that transmitter does not know the channel but the perfect channel state information (CSI) is available at the receiver. We derive the joint channel estimation and data detection where the fixed-lag maximum a posteriori probability is calculated and the CSI is implicitly estimated through a linear Wiener prediction filter.; We propose the interleaved system by concatenating a simple ST-CPM with outer code through a random interleaver. This serial concatenated system can achieve high performance with moderate overall complexity by iterative decoding. The performance gain is even more significant in relatively fast fading since time diversity can be exploited.; Although CPM system has significant advantage for its low power, low cost transmitter, the relatively lower bandwidth efficiency has precluded its widespread use due to the inability to use amplitude to communicate information. Since the multiple antenna (MIMO) system can establish high rate communications by implementing many low rate parallel channels, with the increased symmetric information rate, using CPM in a MIMO system will likely provide both high data rate and high performance. Optimal CPM MIMO demodulation would have a significant complexity. We propose the suboptimal demodulation where the “divide and conquer” strategy combined with soft output decoder for each individual transmit antenna is used. With more receive antennas than transmit antennas, this suboptimal method can yield near-optimal performance with acceptable complexity. (Abstract shortened by UMI.)...