A 6.2–9.5 GHz receiver for Wimedia MB-OFDM and China UWB standard

Abstract

An integrated 6.2-9.5 GHz UWB receiver for both WiMedia MB-OFDM and China UWB standard is proposed. The receiver can cover Group#3, Group#4 for WiMedia and Group#2-5 for China UWB standard respectively. The fully differential receiver consists of a wideband LNA and a down conversion mixer with high gain and low gain mode. A low-pass filter with controllable gain and cut-off frequency along with a programmable gain amplifier are also included. The chip was fabricated in TSMC 0.13-µm RF CMOS process. Measurement results show that the receiver achieves voltage gain from 21 to 69 dB with 2 dB/step and an NF of 3.2-4.6 dB over 6.2-9.5 GHz and 1-dB compression point of −21 dBm. The intermediate frequency of the receiver can be switched between 264 and 132 MHz, which enables the receiver applicable for both WiMedia and China UWB standard. Power consumption is only 47 mA with 1.2-V supply voltage.

Waveform design and high-resolution imaging of cognitive radar based on compressive sensing

“…OFDM has been widely used in communication systems to accomplish simultaneous use of several subcarriers [15][16][17][18]. In recent years, it has been applied to radar signal processing [19,20].…”

An efficient sparse channel estimator combining time-domain LS and iterative shrinkage for OFDM systems with IQ-imbalances

“…where • 0 is called the zero-norm and x 0 stands for the number of nonzeros in the vector x. It is noted that rank(A) = 2L + 2 is a necessary condition for solving (17) and (19). Thus, it is very important to design pilot symbol vector s well such that rank(A) = 2L + 2.…”

“…For that reason, in this paper, we focus on the CS-based sparse channel estimation in OFDM systems with IQ-imbalances at both transmitter and receiver. Through offering an excellent performance of the CS-based channel estimation, this channel estimation is very suitable to achieve a high accuracy of chunk-based resource allocation including bit, subcarrier, and power in OFDM/OFDMA systems [16][17][18][19][20][21].…”

“…If the above iterative process can fully exploit the sparse property of channel and converges to the exact g paths where g is the exact number of paths in sparse wireless channel, then it may achieve a SNR gain over (19) by a factor of (L + 1)/g. After H a and H b are estimated by (18) or (30), the frequency-domain LS (FD-LS) equalizer in [15] is adopted to compensate for IQ imbalances.…”

A Novel Reconfigurable MB-OFDM UWB LNA Using Programmable Current Reuse

“…UWB supports carrierless baseband signals such as impulse-radio IR-UWB, and it supports wideband with carrier such as multiband orthogonal frequency division multiplexing MB-OFDM UWB [2]. In MB-OFDM UWB systems, the spectrum from 3.1 to 10.6 GHz is divided into 14 subbands of 528 MHz as shown in Figure 1, which supports data rates from 53 to 480 Mbps [3,4].…”