The invention relates to a phase detection method (200), comprising the following steps: receiving a plurality of consecutive values of a receiving signal (Y) with a known sampling frequency f.sub.s as a reaction to a transmitting signal having a known transmitting frequency f.sub.w; determining two differential values (ΔY1, ΔY2), each coming from two consecutive values out of three consecutive values (Y1, Y2, Y3) of the receiving signal (Y); and determining a phase real part (U) and a phase imaginary part (V) of the receiving signal (Y) based on a linear relation between the phase real part (U), the phase imaginary part (V) and the two differential values (ΔY1, ΔY2).

In one aspect, a method for estimating residual carrier frequency offset (CFO) in a phase-modulated wireless signal having pseudo noise (PN) spreading is provided. The method includes receiving, at a digital transceiver, a plurality of PN spread blocks of in-phase and quadrature (I/Q) samples of the phase-modulated wireless signal and performing sample-level de-rotation, symbol-level de-spreading, and sign alignment. The method also includes estimating a phase difference and determining an estimated residual CFO based on the phase difference.

Disclosed are techniques related to wireless communication system in which multi-level encoded modulation (MLCM) is applied to non-coherent communication. In the proposed techniques, a small fraction of differential phase rotations or bits participating in differential symbol coding are protected with strong codes while other complementary differential phase rotations or bits are protected with weaker codes. Compared to conventional non-coherent communication techniques in which a uniform protection is applied to any fraction of differential phase rotation or any bit of a differential symbol, the proposed MLCM approach enables more spectrally efficient scheme.

A communication system comprising: input buffers adapted for buffering incoming data streams of samples from one or more channels; a receiver adapted for sequentially processing data from the input buffers; a processing rate of the receiver is higher than or equal to an incoming data rate of the incoming data; context memory adapted for saving an internal status of the receiver after processing the data corresponding with an input buffer before switching to a next input buffer and for restoring the internal status, wherein the receiver is adapted for processing the incoming data in a frame detection phase, and in a frame demodulation phase in which frames and/or subframes are demodulated into bits and wherein the internal status of the receiver related to an input buffer is only saved and restored in the frame detection phase or before and after demodulating subframes.

A communication system comprising: input buffers adapted for buffering incoming data streams of samples from one or more channels; a receiver adapted for sequentially processing data from the input buffers; a processing rate of the receiver is higher than or equal to an incoming data rate of the incoming data; context memory adapted for saving an internal status of the receiver after processing the data corresponding with an input buffer before switching to a next input buffer and for restoring the internal status, wherein the receiver is adapted for processing the incoming data in a frame detection phase, and in a frame demodulation phase in which frames and/or subframes are demodulated into bits and wherein the internal status of the receiver related to an input buffer is only saved and restored in the frame detection phase or before and after demodulating subframes.

Methods and systems for I/O mismatch calibration and compensation for wideband communication receivers may include receiving a radio frequency (RF) signal in a receiver of a communication device, down-sampling said received RF signal to generate a channel k and its image channel −k at baseband frequencies, determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k, removing said average I and Q gain and phase mismatch of said channel k and said image channel −k, determining, after said removing said average I and Q gain and phase mismatch, a residual phase tilt of said channel k and said image channel −k, and compensating for said determined residual phase tilt of said channel k and said image channel −k utilizing a phase tilt correction filter.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may enter a lower power mode of operation, and may receive, from a base station, a non-coherent signal while the UE is operating in the lower power mode. The UE may identify an indication to transition from the lower power mode to a higher power mode of operation based at least in part on receiving the non-coherent signal. The UE may enter the higher power mode based at least in part on identifying the indication.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may enter a lower power mode of operation, and may receive, from a base station, a non-coherent signal while the UE is operating in the lower power mode. The UE may identify an indication to transition from the lower power mode to a higher power mode of operation based at least in part on receiving the non-coherent signal. The UE may enter the higher power mode based at least in part on identifying the indication.

A digital radio receiver adapted to receive radio signals modulated using continuous phase frequency shift keying, CPFSK. The receiver comprises means for receiving a radio signal (2), a correlator (8) arranged to estimate a frequency offset between the carrier frequency of the received radio signal and a nominal carrier frequency, means for correcting said frequency offset (4) and outputting a frequency-corrected radio signal (6), and a matched filter bank, MFB, which comprises a plurality of filters (20,22), each of which corresponds to a different bit pattern, for determining a bit sequence (36) from the frequency-corrected radio signal (6).

Interfacing according to a common public radio interface in a base station in a mobile communication system is described. The interfacing comprises a conversion process for rate-converting legacy data samples. First a predetermined number of the legacy data samples is converted to frequency samples in a frequency domain, then the frequency samples are zero padded to extend the frequency range according to a related sample rate of a 4G data format and then converted into a number of data samples of the related sample rate. The related sample rate is a multiplication of S/K times a basic frame rate of the 4G data format, S samples being allocated to K frames, K and S being integers and K being 8 or less. Advantageously large buffers for allocating a large number of legacy samples to 4G frames are avoided.