This paper proposes a scheme of combining low-density parity check (LDPC) code with unitary space time modulation (USTM) for noncoherent multiple-input-multiple-output (MIMO) transmitter and receiver over Rayleigh block fading and additive white Gaussian noise (AWGN) channel. The main aim is to design the low complexity coded noncoherent MIMO receiver which is completely dependent on the struct...

Minimum shift keying (MSK) modulation has features such as constant envelope, compact spectrum and good error performance, which are all desirable in many digital applications including mobile radio. Numerous receiver structures to demodulate MSK have been suggested, such as correlation receivers, differential detectors and frequency discriminators. MSK is a form of biphase keying and can be de...

A wide-spread test of the PLL FM demodulator under Gaussian modulation is simulated using the Monte Carlo method. Unified noise-free and noise performance analyses of the PLL FM demodulator are presented. Substantial reduction of the modulation limit by the input bandpass filter is reported in the region of the input bandwidth of practical interest. Bessel bandpass filters of order greater than...

Abslruer-An all-digital architecture is presented for implementing the front-end signal processing functions in a quadrature modulator and demodulator for high bit-rate digital radio applications. A pair of CMOS chips has been designed and submitted for fabrication in a 1.25 pm process and is expected to accommodate symbol rates up to 35 MBd. The modulator chip accepts a pair of 8 b in-phase an...

A DS-CDMA demodulator uses analog sampled-data signal processing to achieve a 75-mW power dissipation and a 128-MS/s processing rate in a 1.2m double-metal double-poly CMOS process. To demodulate the signal, a low-power passive correlation technique is introduced that eliminates the integrating opamp with its associated power and settling time overhead. In a prototype demodulator, six 64-chip c...

This work considers a high rate, multiple input multiple output (MIMO) system using multiple codes, as well as channel coding and space time (ST) coding. The transmitter consists of a channel encoder followed by parallel Linear Dispersion Codes (LDC) ST encoders using different spreading codes. The iterative receiver consists of a soft input and soft output (SISO) demodulator, followed by a SIS...

It has been demonstrated recently than use of chaotic spreading codes can significantly increase transmission privacy for direct-sequence spread spectrum systems. In this note, we consider the problem of receiver synchronization as a dual estimation of the clean state and the underlying model parameters from the observed noisy chaotic signal. An efficient implementation of the demodulator is in...